San Bernardino Warnings, Watches and Advisories

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SAFETY and DATA MESSAGE

Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards San Bernardino.

Use the Radar Maps link provided to understand the trajectory of a storm.

Air Quality Alert

Air Quality Alert issued February 11 at 11:02PM MST by NWS Phoenix AZ

* WHAT...The South Coast AQMD has issued an air quality alert due to harmful levels of particle pollution from windblown dust. * WHERE...the Banning Pass, Coachella Valley, and Eastern Riverside County. Levels of particle pollution can vary by time and location depending on emissions and local weather conditions. * WHEN...through 5 AM Wednesday. * IMPACTS... Particle pollution can get deep into the lungs and cause serious health problems such as asthma attacks, heart and lung disease symptoms, and increased risk of lung infections. Everyone can be affected, but sensitive groups such as people with lung or heart disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk.

Area
Joshua Tree NP West; Joshua Tree NP East; Chuckwalla Mountains; Chiriaco Summit; Chuckwalla Valley

Wind Advisory

Wind Advisory issued February 11 at 9:39PM PST until February 12 at 10:00AM PST by NWS San Diego CA

* WHAT...West winds 25 to 35 mph with gusts up to 55 mph expected. * WHERE...San Diego County Deserts. * WHEN...Until 10 AM PST Wednesday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Area
San Diego County Deserts

Wind Advisory

Wind Advisory issued February 11 at 9:14PM PST until February 12 at 4:00AM PST by NWS Phoenix AZ

* WHAT...West winds 20 to 30 mph with gusts up to 60 mph. * WHERE...Southwest corner of Imperial County. * WHEN...Until 4 AM PST Wednesday. * IMPACTS...Difficult driving conditions, especially for larger vehicles traveling along roads with crosswinds. Light, unsecured objects may become airborne.

Area
Imperial County Southwest

High Wind Watch

High Wind Watch issued February 11 at 9:14PM PST until February 14 at 10:00AM PST by NWS San Francisco CA

* WHAT...Southwest winds 25 to 35 mph with gusts up to 60 mph possible. * WHERE...The East Bay and San Francisco Bay Shoreline, Interior Central Coast, North Bay Interior Mountains and Valleys, The Santa Clara Valley and Eastern Hills, and The Santa Cruz Mountains. * WHEN...From Wednesday evening through Friday morning. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel could be difficult, especially for high profile vehicles. Strong winds may move loose debris, result in minor damage property, and cause sporadic power outages. Travel could become difficult, especially for high profile vehicles. The combination of wind and moist soils will increase the risk for downed trees.

Area
Sonoma Coastal Range; North Bay Interior Mountains; North Bay Interior Valleys; San Francisco Bay Shoreline; East Bay Interior Valleys; Santa Cruz Mountains; Santa Clara Valley Including San Jose; Eastern Santa Clara Hills; East Bay Hills; Southern Salinas Valley/Arroyo Seco and Lake San Antonio; Santa Lucia Mountains and Los Padres National Forest; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park; Northern Salinas Valley/Hollister Valley and Carmel Valley

High Wind Watch

High Wind Watch issued February 11 at 9:14PM PST until February 14 at 10:00AM PST by NWS San Francisco CA

* WHAT...Southwest winds 35 to 40 mph with gusts up to 70 mph possible. Isolated gusts to 80 mph along some coastal areas such as the Big Sur Coast and Marin Coastal Range. * WHERE...Monterey Bay and the Big Sur Coast, The Marin Hills, San Francisco, Coastal North Bay Including Point Reyes National Seashore, and San Francisco Peninsula Coast. * WHEN...From Wednesday evening through Friday morning. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel could be difficult, especially for high profile vehicles. Strong winds may move loose debris, result in minor damage property, and cause sporadic power outages. Travel could become difficult, especially for high profile vehicles. The combination of wind and moist soils will increase the risk for downed trees.

Area
San Francisco; Marin Coastal Range; Coastal North Bay Including Point Reyes National Seashore; San Francisco Peninsula Coast; Northern Monterey Bay; Southern Monterey Bay and Big Sur Coast

Flood Watch

Flood Watch issued February 11 at 9:13PM PST until February 15 at 10:00PM PST by NWS San Francisco CA

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...Sonoma and Marin counties. * WHEN...From Wednesday evening through Saturday evening. * IMPACTS...Heavy rain may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. * ADDITIONAL DETAILS... - Unsettled wet weather over the past week has led to elevated levels on area rivers, streams, and creeks as well as saturated the soil resulting in an increased flooding potential as the next Atmospheric River moves in. This next round of moderate to heavy rain is expected Wednesday night into Thursday. - http://www.weather.gov/safety/flood

Area
Marin Coastal Range; Sonoma Coastal Range; North Bay Interior Mountains; Coastal North Bay Including Point Reyes National Seashore; North Bay Interior Valleys

Flood Watch

Flood Watch issued February 11 at 9:13PM PST until February 15 at 10:00PM PST by NWS San Francisco CA

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...San Francisco, San Mateo, Santa Cruz, and Monterey counties. * WHEN...From Wednesday evening through Saturday evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Storm drains and ditches may become clogged with debris. Extensive street flooding and flooding of creeks and rivers are possible. * ADDITIONAL DETAILS... - Unsettled wet weather expected to resume tonight into Wednesday leading to an increased flooding potential as the next Atmospheric River moves in. This next round of moderate to heavy rain is expected Wednesday night into Thursday. Area rivers, streams and creeks that are prone to rapid rises will bring additional flooding concerns to the Central Coast where the heaviest rainfall is likely within the Santa Cruz Mountains and the Santa Lucia Range. - http://www.weather.gov/safety/flood

Area
San Francisco; San Francisco Bay Shoreline; San Francisco Peninsula Coast; Santa Cruz Mountains; Southern Salinas Valley/Arroyo Seco and Lake San Antonio; Santa Lucia Mountains and Los Padres National Forest; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park; Northern Salinas Valley/Hollister Valley and Carmel Valley; Northern Monterey Bay; Southern Monterey Bay and Big Sur Coast

High Surf Advisory

High Surf Advisory issued February 11 at 8:17PM PST until February 12 at 5:00AM PST by NWS Los Angeles/Oxnard CA

* WHAT...Large breaking waves of 4 to 7 feet with dangerous rip currents. * WHERE...Ventura County Beaches. * WHEN...Until 5 AM PST Wednesday. * IMPACTS...There is an increased risk for ocean drowning. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore.

Area
Ventura County Beaches

Flash Flood Watch

Flash Flood Watch issued February 11 at 8:05PM PST until February 14 at 12:00AM PST by NWS Los Angeles/Oxnard CA

* WHAT...Flash flooding and debris flows caused by excessive rainfall are possible. * WHERE...In and near the Lake burn scar in Santa Barbara County. * WHEN...From Thursday morning through Thursday evening. * IMPACTS...Heavy rain over the Lake burn scar could trigger life-threatening and damaging flooding and debris flows. * ADDITIONAL DETAILS... - National Weather Service is forecasting heavy rainfall over the Lake burn scar, which may lead to flash flooding and debris flows. - http://www.weather.gov/safety/flood

Area
Santa Ynez Valley; Santa Barbara County Interior Mountains

Flash Flood Watch

Flash Flood Watch issued February 11 at 8:05PM PST until February 14 at 4:00AM PST by NWS Los Angeles/Oxnard CA

* WHAT...Flash flooding and debris flows caused by excessive rainfall are possible. * WHERE...In and near burn scars in Los Angeles and Ventura Counties with the greatest risk within or near the Eaton, Palisades/Franklin, and Bridge burn scars. * WHEN...From Thursday morning through late Thursday night. * IMPACTS...Heavy rain over the burn scars could trigger life-threatening and damaging flooding and debris flows. * ADDITIONAL DETAILS... - National Weather Service is forecasting heavy rainfall over numerous burn scars with the greatest risk over and near the Eaton, Palisades/Franklin, and Bridge, which may lead to flash flooding and debris flows. - http://www.weather.gov/safety/flood

Area
Santa Clarita Valley; Ventura County Inland Coast; Central Ventura County Valleys; Malibu Coast; Los Angeles County Beaches; Palos Verdes Hills; Los Angeles County Inland Coast including Downtown Los Angeles; Western Santa Monica Mountains Recreational Area; Eastern Santa Monica Mountains Recreational Area; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Southeastern Ventura County Valleys; Santa Susana Mountains; Northern Ventura County Mountains; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Los Angeles County San Gabriel Valley

Flood Watch

Flood Watch issued February 11 at 8:05PM PST until February 14 at 12:00PM PST by NWS Los Angeles/Oxnard CA

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...San Luis Obispo County. * WHEN...From late Wednesday night through Friday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks, especially in and below the Santa Lucia Range. * ADDITIONAL DETAILS... - Periods of heavy are expected to develop late Wednesday night into Thursday with rain rates possibly exceeding one half inch per hour, especially in the Santa Lucia Range. - http://www.weather.gov/safety/flood

Area
San Luis Obispo County Beaches; San Luis Obispo County Inland Central Coast; Santa Lucia Mountains; Southern Salinas Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains

Winter Storm Warning

Winter Storm Warning issued February 11 at 8:03PM PST until February 14 at 10:00PM PST by NWS Hanford CA

* WHAT...Heavy snow expected. Total snow accumulations up to 85 inches. Winds gusting as high as 60 mph. * WHERE...Sierra Nevada, mainly above 7,000 feet. * WHEN...From 10 PM Wednesday to 10 PM PST Friday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning and evening commutes. Strong winds could cause tree damage.

Area
Yosemite NP outside of the valley; Upper San Joaquin River; Kaiser to Rodgers Ridge; Kings Canyon NP; Grant Grove Area; Sequoia NP; South End of the Upper Sierra

Flood Watch

Flood Watch issued February 11 at 8:01PM PST until February 14 at 10:00PM PST by NWS Hanford CA

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of central California, including the following areas, Fresno-Tulare Foothills, Fresno-Tulare Lower Sierra, Kern River Valley, Mariposa Madera Foothills, Mariposa-Madera Lower Sierra, Piute Walker Basin, South End Sierra Foothills and South End of the Lower Sierra. * WHEN...From Wednesday evening through Friday evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Heavy rainfall amounts are expected with this storm. -The Borel Fire Burn Scar is forecast to receive the most amount of rain it has all year leading to elevated flooding concerns. -Other burn scars including the Basin Fire have concerns of flooding due to being more directly targeted by the storm. - http://www.weather.gov/safety/flood

Area
Mariposa Madera Foothills; Mariposa-Madera Lower Sierra; Fresno-Tulare Foothills; Fresno-Tulare Lower Sierra; South End Sierra Foothills; South End of the Lower Sierra; Kern River Valley; Piute Walker Basin

Flood Watch

Flood Watch issued February 11 at 7:45PM PST until February 14 at 4:00AM PST by NWS San Diego CA

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of Southwest California, including the following areas, Orange County Coastal Areas, Orange County Inland Areas, Riverside County Mountains, San Bernardino County Mountains, San Bernardino and Riverside County Valleys-The Inland Empire, San Diego County Coastal Areas, San Diego County Mountains, San Diego County Valleys and Santa Ana Mountains and Foothills. * WHEN...From Thursday morning through late Thursday night. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. Debris flows possible in and below recent burn scars. * ADDITIONAL DETAILS... - An atmospheric river will generate moderate to heavy rainfall Thursday into early Friday with rainfall rates of 0.30-0.50 inch/hour, locally up to 0.75 inch/hour at times on the coastal mountain slopes. - https://www.weather.gov/safety/flood

Area
San Diego County Coastal Areas; San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; San Bernardino County Mountains; Riverside County Mountains; Santa Ana Mountains and Foothills; San Diego County Mountains; Orange County Coastal; Orange County Inland

High Surf Warning

High Surf Warning issued February 11 at 6:54PM PST until February 15 at 3:00AM PST by NWS San Francisco CA

* WHAT...Dangerously large breaking waves of 20 to 30 ft and up to 45 ft for the highest waves on west facing beaches. Non- west facing beaches will see 15 to 20 ft waves and up to 30 ft peak waves. * WHERE...San Francisco, Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast, Northern Monterey Bay and Southern Monterey Bay and Big Sur Coast Counties. * WHEN...From 3 PM Thursday to 3 AM PST Saturday. * IMPACTS...Breaking waves can sweep people off jetties and docks, and into dangerous seas. Life-threatening swimming conditions and significant beach erosion can be expected. Sudden immersion in cold water can result in cold water shock even for the most experienced swimmers. Cold water shock can result in dramatic changes in breathing, heart rate and blood pressure, greatly increasing the risk of drowning in rough open waters.

Area
San Francisco; Coastal North Bay Including Point Reyes National Seashore; San Francisco Peninsula Coast; Northern Monterey Bay; Southern Monterey Bay and Big Sur Coast

Wind Advisory

Wind Advisory issued February 11 at 4:43PM PST until February 12 at 4:00AM PST by NWS Hanford CA

* WHAT...West winds 25 to 35 mph with gusts up to 55 mph. * WHERE...Mojave Desert Slopes. * WHEN...Until 4 AM PST Wednesday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Area
Mojave Desert Slopes

Cold Weather Advisory

Cold Weather Advisory issued February 11 at 2:07PM PST until February 12 at 9:00AM PST by NWS Eureka CA

* WHAT...For the Cold Weather Advisory, very cold wind chills as low as 24 expected. For the Wind Advisory, southeast winds 25 to 35 mph with gusts up to 55 mph expected. * WHERE...Southwestern Humboldt. * WHEN...For the Cold Weather Advisory, from 2 AM to 9 AM PST Wednesday. For the Wind Advisory, from 6 PM Wednesday to 7 AM PST Thursday. * IMPACTS...Wind gusts will be particularly strong along windward ridges and exposed coastal headlands.

Area
Southwestern Humboldt

Cold Weather Advisory

Cold Weather Advisory issued February 11 at 2:07PM PST until February 12 at 9:00AM PST by NWS Eureka CA

* WHAT...For the Cold Weather Advisory, very cold wind chills as low as 26 expected. For the Wind Advisory, southwest winds 20 to 30 mph with gusts up to 45 mph expected. * WHERE...Southern Lake. * WHEN...For the Cold Weather Advisory, from 2 AM to 9 AM PST Wednesday. For the Wind Advisory, from noon Thursday to 2 AM PST Friday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Area
Southern Lake County

Cold Weather Advisory

Cold Weather Advisory issued February 11 at 2:07PM PST until February 12 at 9:00AM PST by NWS Eureka CA

* WHAT...Very cold wind chills as low as 25 expected. * WHERE...Southeastern Mendocino Interior. * WHEN...From 2 AM to 9 AM PST Wednesday. * IMPACTS...Wind chill values, along with very cold temperatures, can lead to hypothermia with prolonged exposure.

Area
Southeastern Mendocino Interior

Cold Weather Advisory

Cold Weather Advisory issued February 11 at 2:07PM PST until February 12 at 9:00AM PST by NWS Eureka CA

* WHAT...Very cold wind chills as low as 27 expected. * WHERE...Del Norte and Northern Humboldt Coast. * WHEN...From 2 AM to 9 AM PST Wednesday. * IMPACTS...Wind chill values, along with very cold temperatures, can lead to hypothermia with prolonged exposure.

Area
Coastal Del Norte; Northern Humboldt Coast

Wind Advisory

Wind Advisory issued February 11 at 2:07PM PST until February 13 at 7:00AM PST by NWS Eureka CA

* WHAT...For the Cold Weather Advisory, very cold wind chills as low as 24 expected. For the Wind Advisory, southeast winds 25 to 35 mph with gusts up to 55 mph expected. * WHERE...Southwestern Humboldt. * WHEN...For the Cold Weather Advisory, from 2 AM to 9 AM PST Wednesday. For the Wind Advisory, from 6 PM Wednesday to 7 AM PST Thursday. * IMPACTS...Wind gusts will be particularly strong along windward ridges and exposed coastal headlands.

Area
Southwestern Humboldt

Wind Advisory

Wind Advisory issued February 11 at 2:07PM PST until February 13 at 7:00AM PST by NWS Eureka CA

* WHAT...Southeast winds 25 to 35 mph with gusts up to 50 mph expected. * WHERE...Humboldt Interior, and Del Norte Interior. * WHEN...From 6 PM Wednesday to 7 AM PST Thursday. * IMPACTS...Wind gusts will be particularly strong along windward ridges and exposed coastal headlands.

Area
Del Norte Interior; Northern Humboldt Interior; Southern Humboldt Interior

Wind Advisory

Wind Advisory issued February 11 at 2:07PM PST until February 14 at 2:00AM PST by NWS Eureka CA

* WHAT...For the Cold Weather Advisory, very cold wind chills as low as 26 expected. For the Wind Advisory, southwest winds 20 to 30 mph with gusts up to 45 mph expected. * WHERE...Southern Lake. * WHEN...For the Cold Weather Advisory, from 2 AM to 9 AM PST Wednesday. For the Wind Advisory, from noon Thursday to 2 AM PST Friday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Area
Southern Lake County

Flood Warning

Flood Warning issued February 11 at 1:54PM PST until February 14 at 1:00AM PST by NWS Sacramento CA

...The Flood Warning continues for the following rivers in California... Yolo Bypass Near Lisbon affecting Yolo and Solano Counties. For the Yolo Bypass...including Lisbon...Minor flooding is forecast. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Yolo Bypass near Lisbon. * WHEN...Until early Friday morning. * IMPACTS...At 19.0 feet, Mound Farms and Senator Outing Duck Club are flooded. * ADDITIONAL DETAILS... - At 1:15 PM PST Tuesday the stage was 20.0 feet. - Bankfull stage is 13.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 1:15 PM PST Tuesday was 20.2 feet. - Forecast...The river is expected to fall below flood stage late Thursday morning and continue falling to 18.9 feet early Thursday afternoon. - Flood stage is 19.0 feet. - Flood History...This crest compares to a previous crest of 20.0 feet on 02/24/1996. - http://www.weather.gov/safety/flood

Area
Solano, CA; Yolo, CA

Flood Warning

Flood Warning issued February 11 at 1:50PM PST by NWS Sacramento CA

...The Flood Warning is extended for the following rivers in California... Sacramento River At Tehama Bridge affecting Tehama County. .A series of strong winter storms brought periods of moderate to heavy rainfall to Northern California last week. This has resulted in continued elevated flow at some locations along the mainstem Sacramento River and its tributaries. Additional moderate to heavy precipitation is expected Thursday into Friday with renewed rises. For the Upper Sacramento River...including Tehama Bridge...Minor flooding is forecast. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Sacramento River at Tehama Bridge. * WHEN...Until further notice. * IMPACTS...At 206.7 feet, Water into rv park on east side of river. Tires of trailers get wet. At 209.7 feet, Flood stage - Road inside trailer park and turn around site under RR tracks (Tehama/Vina road) become impassible. Water is into area around structures on east side of river. No structural damage. Sheriff's office issues advisory. Makes sure Pelhams Bay, Snug Harbor, River Inn (small trailer parks all in a row on east side of river north of bridge) know of advisory. At 210.7 feet, Between 210 and 211 feet the county park becomes inaccessible. At 211 feet water begins to enter Driftwood RV fishing resort on east bank of river and just north of the county park. * ADDITIONAL DETAILS... - At 1:00 PM PST Tuesday the stage was 210.9 feet. - Bankfull stage is 206.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 1:00 PM PST Tuesday was 211.0 feet. - Forecast...The river is expected to rise to a crest of 211.0 feet late this afternoon. It will then rise to 212.4 feet early Thursday afternoon. Additional rises are possible thereafter. - Flood stage is 209.5 feet. - Flood History...This crest compares to a previous crest of 212.3 feet on 02/19/2024. - http://www.weather.gov/safety/flood

Area
Tehama, CA

Flood Watch

Flood Watch issued February 11 at 1:42PM PST until February 13 at 4:00PM PST by NWS Eureka CA

* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...Lake and Southern Mendocino Counties. * WHEN...From Wednesday evening through Thursday afternoon. * IMPACTS...There will be an increased risk of rock and land slides along roadways. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - A moderate atmospheric river will begin to impact the area late Wednesday night through Thursday. 1.5 to 3.0 inches of rain is most likely over 24 hours. High resolution models indicate periods of rain rates up 0.5 inches possible over Mendocino and Lake Counties. With the ground still saturated, such high rain rates have the potential to drive moderate urban and small stream flooding. - http://www.weather.gov/safety/flood

Area
Mendocino Coast; Northwestern Mendocino Interior; Southwestern Mendocino Interior; Southeastern Mendocino Interior; Northern Lake County; Southern Lake County

Air Quality Alert

Air Quality Alert issued February 11 at 1:19PM PST by NWS San Diego CA

* WHAT...The South Coast AQMD has issued an air quality alert due to harmful levels of particle pollution from windblown dust. * WHERE...the Banning Pass, Coachella Valley, and Eastern Riverside County. Levels of particle pollution can vary by time and location depending on emissions and local weather conditions. * WHEN...through 5 AM Wednesday. * IMPACTS... Particle pollution can get deep into the lungs and cause serious health problems such as asthma attacks, heart and lung disease symptoms, and increased risk of lung infections. Everyone can be affected, but sensitive groups such as people with lung or heart disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk.

Area
Coachella Valley; San Gorgonio Pass Near Banning

Winter Storm Warning

Winter Storm Warning issued February 11 at 1:03PM PST until February 14 at 10:00PM PST by NWS Reno NV

* WHAT...Heavy snow. Snow accumulations between 10 and 18 inches with up to 2 feet along the highest mountain peaks. 2 to 6 inches along and east of US-395. * WHERE...Lassen-Eastern Plumas-Eastern Sierra Counties. * WHEN...From 10 PM Wednesday to 10 PM PST Friday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact morning and evening commutes from Wednesday through Friday.

Area
Lassen-Eastern Plumas-Eastern Sierra Counties

Winter Storm Warning

Winter Storm Warning issued February 11 at 1:03PM PST until February 14 at 10:00PM PST by NWS Reno NV

* WHAT...Heavy snow. Snow accumulations between 1 to 3 feet along and west of US-395 with 4 to 5 feet along the Sierra crest. 2 to 8 inches for lower elevations east of US-395. Ridge winds gusting as high as 100 mph with gusts up to 50 mph at lower elevations. * WHERE...Mono County. * WHEN...From 10 PM Wednesday to 10 PM PST Friday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact morning and evening commutes from Wednesday through Friday. * ADDITIONAL DETAILS...Heaviest snowfall rates of 1 to 3 inches per hour will be possible Thursday morning through Thursday night. Heavy snow along with gusty winds may result in periods zero visibility.

Area
Mono

Winter Storm Warning

Winter Storm Warning issued February 11 at 1:03PM PST until February 14 at 10:00PM PST by NWS Reno NV

* WHAT...Heavy snow. Snow accumulations up to 2 feet along and west of Hwy 89 with 2 to 4 feet along the Sierra crest. 10 to 18 inches around lake level. Ridge winds gusting as high as 100 mph with gusts up to 50 mph at lower elevations. Lake Tahoe waves between 2 to 4 feet. * WHERE...Greater Lake Tahoe Area. * WHEN...From 10 PM Wednesday to 10 PM PST Friday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact morning and evening commutes from Wednesday through Friday. * ADDITIONAL DETAILS...Heaviest snowfall rates of 1 to 3 inches per hour will be possible Thursday morning through Thursday night. Heavy snow along with gusty winds may result in periods zero visibility.

Area
Greater Lake Tahoe Area; Greater Lake Tahoe Area

Winter Storm Warning

Winter Storm Warning issued February 11 at 1:02PM PST until February 14 at 4:00AM PST by NWS Medford OR

* WHAT...Heavy snow possible. Total snow accumulations of 4 to 12 inches possible above 3000 feet elevation, with locally higher amounts up to 18 inches possible over the higher mountains. Winds could gust as high as 50 mph. * WHERE...Western Siskiyou County County. This includes higher portions of Sawyers Bar Road west of Etna and areas along Highway 3 near and south of Callahan to Scott Mountain summit. * WHEN...From 10 PM Wednesday to 4 AM PST Friday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning and evening commutes. Strong winds could cause extensive damage to trees and power lines.

Area
Western Siskiyou County

Winter Storm Warning

Winter Storm Warning issued February 11 at 1:02PM PST until February 14 at 4:00AM PST by NWS Medford OR

* WHAT...Heavy snow possible. Total snow accumulations between 6 and 12 inches. Locally higher amounts up to 18 inches are possible above 4500 feet elevation with winds possibly gusting as high as 55 mph. * WHERE...South Central and Southeast Siskiyou County. This includes Mount Shasta City, Dunsmuir, McCloud, and Tennant. This also includes portions of Interstate 5 from Black Butte summit southward and Highway 89 east of Mount Shasta City. * WHEN...From 10 PM Wednesday to 4 AM PST Friday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning and evening commutes. Strong winds could cause extensive damage to trees and power lines. * ADDITIONAL DETAILS...Snow levels will start near 2000 feet then rise in the afternoon to around 4000 feet. For lower elevations below 4000 feet, including the Mount Shasta City area, moderate to heavy snow is expected Wednesday night and Thursday morning, then transitioning to rain. For elevations at and above 4000 feet, warning level snowfall is expected Wednesday night through Thursday night.

Area
South Central Siskiyou County; North Central and Southeast Siskiyou County

Wind Advisory

Wind Advisory issued February 11 at 12:53PM PST until February 12 at 3:00AM PST by NWS Los Angeles/Oxnard CA

* WHAT...West winds 20 to 30 mph with gusts up to 45 mph. * WHERE...Antelope Valley, Eastern Antelope Valley Foothills, Interstate 5 Corridor, Western Antelope Valley Foothills, and Western San Gabriel Mountains and Highway 14 Corridor. * WHEN...Until 3 AM PST Wednesday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Area
Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley

High Wind Watch

High Wind Watch issued February 11 at 12:53PM PST until February 14 at 3:00AM PST by NWS Los Angeles/Oxnard CA

* WHAT...Southwest winds 25 to 35 mph with gusts up to 60 mph possible. * WHERE...San Luis Obispo County Beaches, San Luis Obispo County Inland Central Coast, San Luis Obispo County Interior Valleys, San Luis Obispo County Mountains, Santa Barbara County Interior Mountains, Santa Lucia Mountains, and Southern Salinas Valley. * WHEN...From Thursday morning through late Thursday night. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel could be difficult, especially for high profile vehicles.

Area
San Luis Obispo County Beaches; San Luis Obispo County Inland Central Coast; Santa Lucia Mountains; Southern Salinas Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; Santa Barbara County Interior Mountains

Winter Storm Watch

The Winter Storm Watch has been replaced. Please see the latest information from NWS Eureka CA on this developing situation.

The Winter Storm Watch has been replaced. Please see the latest information from NWS Eureka CA on this developing situation.

Area
Northern Trinity; Southern Trinity

Winter Storm Warning

Winter Storm Warning issued February 11 at 12:40PM PST until February 14 at 4:00AM PST by NWS Eureka CA

* WHAT...Heavy wet snow expected for elevations above 2000 feet. 3 to 6 in along high elevations of Highways 299, 36 and 3. 8 to 18 inches along high mountain peaks. * WHERE...Trinity County. * WHEN...From 10 PM Wednesday to 4 AM PST Friday. * IMPACTS...Travel could be very difficult. Chains may be required over high passes. * ADDITIONAL DETAILS...Snow levels will begin as low as 1500 feet early Thursday morning but will quickly rise above 4000 feet during the day.

Area
Northern Trinity; Southern Trinity

Cold Weather Advisory

Cold Weather Advisory issued February 11 at 12:34PM PST until February 12 at 9:00AM PST by NWS Medford OR

* WHAT...For the Cold Weather Advisory, very cold temperatures as low as 5 below. For the Wind Advisory, southeast winds 20 to 30 mph with gusts up to 50 mph expected. * WHERE...For the Cold Weather Advisory, Shasta Valley, including Yreka, Montague and Weed. For the Wind Advisory, southern Shasta Valley including Gazelle and Weed. * WHEN...For the Cold Weather Advisory, until 9 AM PST Wednesday. For the Wind Advisory, from 10 PM Wednesday to 9 AM PST Thursday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Very cold temperatures can lead to hypothermia with prolonged exposure.

Area
Central Siskiyou County

Cold Weather Advisory

Cold Weather Advisory issued February 11 at 12:34PM PST until February 12 at 9:00AM PST by NWS Medford OR

* WHAT...Very cold temperatures with morning lows around 10 degrees to minus 10 degrees will be common, except in the lower Klamath River Valley where low temperatures of 13 to 20 are expected. * WHERE...Siskiyou County and Modoc County, including the communities of Alturas, Newell, MacDoel, Tennant, Mount Shasta City Etna, Happy Camp and surrounding areas. * WHEN...Until 9 AM PST Wednesday. * IMPACTS...Very cold temperatures can lead to hypothermia with prolonged exposure.

Area
Western Siskiyou County; South Central Siskiyou County; North Central and Southeast Siskiyou County; Northeast Siskiyou and Northwest Modoc Counties; Modoc County; South Central Oregon Cascades; Siskiyou Mountains and Southern Oregon Cascades; Klamath Basin; Northern and Eastern Klamath County and Western Lake County; Central and Eastern Lake County

Wind Advisory

Wind Advisory issued February 11 at 12:34PM PST until February 13 at 9:00AM PST by NWS Medford OR

* WHAT...For the Cold Weather Advisory, very cold temperatures as low as 5 below. For the Wind Advisory, southeast winds 20 to 30 mph with gusts up to 50 mph expected. * WHERE...For the Cold Weather Advisory, Shasta Valley, including Yreka, Montague and Weed. For the Wind Advisory, southern Shasta Valley including Gazelle and Weed. * WHEN...For the Cold Weather Advisory, until 9 AM PST Wednesday. For the Wind Advisory, from 10 PM Wednesday to 9 AM PST Thursday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Very cold temperatures can lead to hypothermia with prolonged exposure.

Area
Central Siskiyou County

Wind Advisory

Wind Advisory issued February 11 at 12:28PM PST until February 14 at 10:00AM PST by NWS Sacramento CA

* WHAT...Southerly winds 15 to 25 mph with gusts 40 to 50 mph expected. * WHERE...Sacramento Valley, Northern San Joaquin Valley, Carquinez Strait and Delta. * WHEN...From 10 PM Wednesday to 10 AM PST Friday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Area
Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley; Carquinez Strait and Delta; Northern San Joaquin Valley

Winter Storm Warning

Winter Storm Warning issued February 11 at 11:58AM PST until February 14 at 4:00AM PST by NWS Sacramento CA

* WHAT...Heavy snow above 2000 feet. Total snow accumulations 3 to 8 inches around 2000 feet with 1 to 2 feet above 3500 feet. Winds could gust as high as 45 mph. * WHERE...Mountains Southwestern Shasta County to Western Colusa County and Shasta Lake Area / Northern Shasta County above 2000 feet. * WHEN...From 10 PM Wednesday to 4 AM PST Friday. * IMPACTS...Difficult travel conditions with chain controls and potential road closures. Low visibility due to combination of wind and heavy snow. The hazardous conditions could impact the Thursday morning and evening commutes. Heaviest snowfall Wednesday night through midday Thursday. Snow rates of 1-2 inches per hour at times. * ADDITIONAL DETAILS...Snow levels start off around 1000 to 2000 feet Wednesday night before rising to 3500 to 4500 feet through the day on Thursday.

Area
Shasta Lake Area / Northern Shasta County; Mountains Southwestern Shasta County to Western Colusa County

Winter Storm Warning

Winter Storm Warning issued February 11 at 11:58AM PST until February 14 at 10:00PM PST by NWS Sacramento CA

* WHAT...Heavy snow. Heaviest accumulations of 2 to 5 feet possible above 6000 feet with 5 to 15 inches between 4500 and 6000 feet. Winds could gust as high as 60 mph. * WHERE...West Slope Northern Sierra Nevada and Western Plumas County/Lassen Park above 4500 feet. * WHEN...From 10 PM Wednesday to 10 PM PST Friday. * IMPACTS...Very difficult travel conditions with chain controls and potential road closures. The hazardous conditions could impact the Thursday morning and evening commutes. Heaviest snowfall expected on Thursday with snow rates of 1-2+ inches per hour at times. * ADDITIONAL DETAILS...Snow levels start off around 2500 to 4500 feet Wednesday night before rising to 4500 to 6000 feet through the day on Thursday.

Area
Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada

Winter Storm Warning

Winter Storm Warning issued February 11 at 11:35AM PST until February 14 at 4:00PM PST by NWS Las Vegas NV

* WHAT...Heavy snow is possible in the higher elevations of the Eastern Sierra and White Mountains. 18 to 30 inches of snow is possible for elevations above 7000 feet, with locally higher amounts on the peaks. Winds could gust as high as 60 mph along the Sierra crest. * WHERE...White and Inyo Mountains, and Eastern Sierra Slopes. * WHEN...From 10 PM Wednesday to 4 PM PST Friday. * IMPACTS...Travel could be very difficult to impossible. Strong winds could cause tree damage.

Area
Eastern Sierra Slopes of Inyo County; White Mountains of Inyo County

Flood Watch

Flood Watch issued February 11 at 11:26AM PST until February 14 at 10:00PM PST by NWS Sacramento CA

* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...A portion of northern California, including the following areas, Carquinez Strait and Delta, Sacramento Valley, Motherlode, Mountains Southwestern Shasta County to Western Colusa County before 2500 feet, Northeast Foothills, Shasta Lake Area / Northern Shasta County, West Slope Northern Sierra Nevada and Western Plumas County/Lassen Park below 4500 feet. * WHEN...From Wednesday evening through Friday evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. * ADDITIONAL DETAILS... - Periods of moderate to heavy rainfall are expected from late Wednesday night into Thursday with rainfall totals of 1 to 2.5 inches in the Valley and Delta and 2 to 5 inches in the foothills and mountains below the snow line. Given very wet conditions over the past two weeks, minor flooding impacts are expected with any runoff that occurs. Debris flows over recent burn scars like the Park Fire are not expected but expect increased muddy runoff. - http://www.weather.gov/safety/flood

Area
Shasta Lake Area / Northern Shasta County; Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley; Carquinez Strait and Delta; Mountains Southwestern Shasta County to Western Colusa County; Northeast Foothills/Sacramento Valley; Motherlode; Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada

Cold Weather Advisory

Cold Weather Advisory issued February 11 at 3:59AM PST until February 12 at 8:00AM PST by NWS Reno NV

* WHAT...Very cold wind chills as low as -10 to -15 degrees. * WHERE...The Surprise Valley in Eastern Modoc County and far Northern Washoe County from High Rock Canyon to the Oregon border. * WHEN...Until 8 AM PST Wednesday. * IMPACTS...The cold wind chills as low as 10 to 15 below zero could result in hypothermia if precautions are not taken.

Area
Surprise Valley California; Northern Washoe County
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