San Fernando Warnings, Watches and Advisories

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SAFETY and DATA MESSAGE

Do not drive vehicles through flooded areas. The water depth and road condition may be unsafe. Additional information is available at https://water.weather.gov/ahps2/ Stay tuned for further updates by listening to NOAA weather radio... or your local radio and TV stations.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We provide a wider range of issued 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 Fernando.

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

Flash Flood Warning

Flash Flood Warning issued July 23 at 12:23AM PDT until July 23 at 1:30AM PDT by NWS Las Vegas NV

At 1223 AM PDT, Doppler radar indicated rain still falling over Charleston View, as well as in the higher terrain to the east. Flash flooding is still a concern. HAZARD...Life-threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Radar. IMPACT...Life-threatening flash flooding of low-water crossings, creeks, normally dry washes and roads. Some locations that will experience flash flooding include... Charleston View and Old Spanish Trail Highway

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Area
Inyo, CA

Flash Flood Warning

Flash Flood Warning issued July 23 at 12:06AM PDT until July 23 at 1:15AM PDT by NWS Las Vegas NV

At 1206 AM PDT, Doppler radar indicated light rain falling on Highway 127 between Dumont Dunes and the Inyo County line. Heavy rain fell in this area earlier, and runoff may still be occurring, so flash flooding is still a concern. A flash flood warning is also in effect for Highway 127 just south of Dumont Dunes. HAZARD...Life-threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Radar. IMPACT...Life-threatening flash flooding of low-water crossings, creeks, normally dry washes and roads. Some locations that will experience flash flooding include... Highway 127 from Dumont Dunes to the Inyo County line.

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Area
San Bernardino, CA

Flash Flood Warning

Flash Flood Warning issued July 23 at 12:04AM PDT until July 23 at 3:15AM PDT by NWS Las Vegas NV

FFWVEF The National Weather Service in Las Vegas has issued a * Flash Flood Warning for... San Bernardino County in southern California... * Until 315 AM PDT. * At 1204 AM PDT, Doppler radar indicated thunderstorms producing heavy rain on Highway 127 south of Dumont Dunes. Flash flooding is ongoing or expected to begin shortly. HAZARD...Life-threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Radar. IMPACT...Life-threatening flash flooding of low-water crossings, creeks, normally dry washes and roads. * Some locations that will experience flash flooding include... Highway 127 south of Dumont Dunes

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Area
San Bernardino, CA

Excessive Heat Warning

Excessive Heat Warning issued July 22 at 9:27PM PDT until July 25 at 10:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with high temperatures of 100 to 107. * WHERE...Apple and Lucerne Valleys. * WHEN...Until 10 PM PDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Read Full Alert
Area
Apple and Lucerne Valleys

Excessive Heat Warning

Excessive Heat Warning issued July 22 at 9:27PM PDT until July 25 at 10:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with temperatures of 105 to 110. * WHERE...San Gorgonio Pass Near Banning. * WHEN...Until 10 PM PDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

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Area
San Gorgonio Pass Near Banning

Excessive Heat Warning

Excessive Heat Warning issued July 22 at 9:27PM PDT until July 25 at 10:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with high temperatures 109 to 115, except up to 118 on Thursday. * WHERE...Coachella Valley and San Diego County Deserts. * WHEN...Until 10 PM PDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Read Full Alert
Area
Coachella Valley; San Diego County Deserts

Heat Advisory

Heat Advisory issued July 22 at 9:27PM PDT until July 25 at 10:00PM PDT by NWS San Diego CA

* WHAT...High temperatures 90 to 100. * WHERE...San Diego County Valleys. * WHEN...Until 10 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses.

Read Full Alert
Area
San Diego County Inland Valleys

Heat Advisory

Heat Advisory issued July 22 at 9:27PM PDT until July 25 at 10:00PM PDT by NWS San Diego CA

* WHAT...Highs temperatures 100 to 106. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN...Until 10 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses.

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Area
San Bernardino and Riverside County Valleys-The Inland Empire

Heat Advisory

Heat Advisory issued July 22 at 9:27PM PDT until July 25 at 10:00PM PDT by NWS San Diego CA

* WHAT...High temperatures up to 98. * WHERE...Riverside County Mountains and San Bernardino County Mountains. * WHEN...Until 10 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses.

Read Full Alert
Area
San Bernardino County Mountains; Riverside County Mountains

Heat Advisory

Heat Advisory issued July 22 at 9:27PM PDT until July 25 at 10:00PM PDT by NWS San Diego CA

* WHAT...Temperatures up to 100. * WHERE...San Diego County Mountains. * WHEN...Until 10 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses.

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Area
San Diego County Mountains

Heat Advisory

Heat Advisory issued July 22 at 8:34PM PDT until July 23 at 10:00PM PDT by NWS Eureka CA

* WHAT...High temperatures of to 104 to 109 expected. * WHERE...Southern Lake. * WHEN...Until 10 PM PDT Tuesday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Many of the valleys will see temperatures drop into the 60s, but the ridges may not see as much relief with some locations remaining 75 to 80 overnight.

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Area
Southern Lake County

Heat Advisory

Heat Advisory issued July 22 at 8:34PM PDT until July 23 at 10:00PM PDT by NWS Eureka CA

* WHAT...Heat index values up to 103. * WHERE...Trinity County, Northern Mendocino Interior, Southeastern Mendocino Interior, and Northern Lake. * WHEN...Until 10 PM PDT Tuesday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Many of the valleys will see temperatures drop into the 60s, but the ridges may not see as much relief with some locations remaining 75 to 80 overnight.

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Area
Northern Trinity; Southern Trinity; Northwestern Mendocino Interior; Northeastern Mendocino Interior; Southeastern Mendocino Interior; Northern Lake County

Excessive Heat Warning

Excessive Heat Warning issued July 22 at 7:44PM PDT until July 24 at 11:00PM PDT by NWS Hanford CA

* WHAT...Dangerously hot conditions with high temperatures up to 111 expected. Major to Extreme HeatRisk through the event. * WHERE...A portion of central California. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

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Area
West Side Mountains north of 198; Los Banos - Dos Palos; Merced - Madera - Mendota; Planada - Le Grand - Snelling; Coalinga - Avenal; West Side of Fresno and Kings Counties; Caruthers - San Joaquin - Selma; Fresno-Clovis; West Side Mountains South of 198; Buttonwillow - Lost Hills - I5; Delano-Wasco-Shafter; Hanford - Corcoran - Lemoore; Visalia - Porterville - Reedley; Buena Vista; Bakersfield; Southeast San Joaquin Valley; South End San Joaquin Valley; Mariposa Madera Foothills; Mariposa-Madera Lower Sierra; Fresno-Tulare Foothills; Fresno-Tulare Lower Sierra; South End Sierra Foothills; Yosemite Valley; San Joaquin River Canyon; Kern River Valley

Excessive Heat Warning

Excessive Heat Warning issued July 22 at 7:44PM PDT until July 24 at 11:00PM PDT by NWS Hanford CA

* WHAT...Dangerously hot conditions with high temperatures up to 114 expected. Major to Extreme HeatRisk through the event. * WHERE...Indian Wells Valley, Mojave Desert, and Mojave Desert Slopes. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Read Full Alert
Area
Indian Wells Valley; Mojave Desert Slopes; Mojave Desert

Heat Advisory

Heat Advisory issued July 22 at 2:27PM PDT until July 24 at 11:00PM PDT by NWS San Francisco CA

* WHAT...Daytime temperatures reaching the 90s to near 100. Overnight temperatures will be mild and in the upper 50s to near 70. * WHERE...Interior portions of the North Bay, South Bay, Santa Cruz Mountains and Southern Salinas Valley. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Moderate HeatRisk across inland areas. This level of heat affects individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. * ADDITIONAL DETAILS...The hottest day will be Tuesday.

Read Full Alert
Area
Sonoma Coastal Range; North Bay Interior Mountains; North Bay Interior Valleys; Santa Cruz Mountains; Santa Clara Valley Including San Jose; Southern Salinas Valley/Arroyo Seco and Lake San Antonio

Excessive Heat Warning

Excessive Heat Warning issued July 22 at 2:27PM PDT until July 24 at 11:00PM PDT by NWS San Francisco CA

* WHAT...Dangerously hot conditions with daytime temperatures reaching the upper 90s to lower 100s. Far inland temperatures may reach 108 degrees. Overnight temperatures will be warm and in the 60s and 70s. * WHERE...East Bay Interior Valleys, Eastern Santa Clara Hills, East Bay Hills, Santa Lucia Mountains and Los Padres National Forest and Mountains of San Benito and Interior Monterey County including Pinnacles National Park. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...The hottest day will be Tuesday.

Read Full Alert
Area
East Bay Interior Valleys; Eastern Santa Clara Hills; East Bay Hills; Santa Lucia Mountains and Los Padres National Forest; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park

Coastal Flood Advisory

Coastal Flood Advisory issued July 22 at 1:35PM PDT until July 23 at 2:00AM PDT by NWS San Francisco CA

* WHAT...Minor coastal flooding. * WHERE...Bayshore along the San Francisco Bay and San Pablo Bay. * WHEN...Until 2 AM PDT Tuesday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. * ADDITIONAL DETAILS...Tidal levels are increasing as a result of higher astronomical tides. Low lying areas within the SF Bay Area may see minor flooding as a result during high tide. Next high tide in San Francisco is early Tuesday morning 12:48 AM at 6.60 ft.

Read Full Alert
Area
San Francisco; North Bay Interior Valleys; San Francisco Bay Shoreline

Heat Advisory

Heat Advisory issued July 22 at 1:23PM PDT until July 25 at 10:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Hot conditions with high temperatures of 92 to 100 common each day. Warm overnight conditions in the hills with low temperatures of 70 to 80 common. * WHERE...San Gabriel Valley, Ventura County Valleys, Santa Ynez Valley, and the Santa Ynez Range. * WHEN...From 9 AM Wednesday to 10 PM PDT Thursday. * IMPACTS...There is a high risk for heat illness for sensitive populations including the very young, the very old, those without air conditioning, and those active outdoors.

Read Full Alert
Area
Santa Ynez Valley; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range; Lake Casitas; Ojai Valley; Central Ventura County Valleys; Eastern San Fernando Valley; Southeastern Ventura County Valleys; Los Angeles County San Gabriel Valley

Heat Advisory

Heat Advisory issued July 22 at 1:23PM PDT until July 25 at 10:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Hot conditions with high temperatures of 95 to 105 common. Warm overnight conditions in the hills with low temperatures of 70 to 80 common. * WHERE...The western Los Angeles County valleys, the Santa Susana and Santa Monica Mountains, the southern Salinas Valley, and the Santa Lucia Mountains. * WHEN...Until 10 PM PDT Thursday, hottest Wednesday and Thursday. * IMPACTS...There is a high risk for heat illness for sensitive populations including the very young, the very old, those without air conditioning, and those active outdoors.

Read Full Alert
Area
Santa Clarita Valley; Santa Lucia Mountains; Southern Salinas Valley; Western Santa Monica Mountains Recreational Area; Eastern Santa Monica Mountains Recreational Area; Calabasas and Agoura Hills; Western San Fernando Valley; Santa Susana Mountains

Excessive Heat Warning

Excessive Heat Warning issued July 22 at 1:23PM PDT until July 25 at 10:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Long duration of dangerously hot conditions with high temperatures of 100 to 110 common. Warm overnight conditions with low temperatures of 72 to 82 common. * WHERE...The mountains and interior valleys of southwest California. * WHEN...Until 10 PM PDT Thursday. * IMPACTS...There is a high risk for dangerous heat illness for anyone, especially for the very young, the very old, those without air conditioning, and those active outdoors.

Read Full Alert
Area
Cuyama Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley

Heat Advisory

Heat Advisory issued July 22 at 1:22PM PDT until July 24 at 11:00PM PDT by NWS Sacramento CA

* WHAT...High temperatures 95 to 105. Limited overnight relief with lows temperatures in the mid 60s to mid 70s. * WHERE...Carquinez Strait and Delta. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Widespread Moderate HeatRisk is expected. This level of heat could impact outdoor activities.

Read Full Alert
Area
Carquinez Strait and Delta

Heat Advisory

Heat Advisory issued July 22 at 1:22PM PDT until July 24 at 11:00PM PDT by NWS Sacramento CA

* WHAT...Hot conditions, with high temperatures 100 to 112 and warm overnight low temperatures in the upper 60s to lower 80s. * WHERE...Central Sacramento Valley, Motherlode, Northeast Foothills/Sacramento Valley, Northern Sacramento Valley, Northern San Joaquin Valley, and Southern Sacramento Valley. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Heat related illnesses will be possible, especially for groups that are sensitive to heat. * ADDITIONAL DETAILS...Widespread Major HeatRisk is expected. This level of heat could impact outdoor activities.

Read Full Alert
Area
Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley; Northern San Joaquin Valley; Northeast Foothills/Sacramento Valley; Motherlode

Excessive Heat Warning

Excessive Heat Warning issued July 22 at 1:03PM MST until July 26 at 8:00PM MST by NWS Phoenix AZ

* WHAT...Dangerously hot conditions. Afternoon temperatures 105 to 117 degrees with heat indices up to 122 degrees. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. * WHERE...Portions of southwest Arizona and southeast and southern California. * WHEN...Until 8 PM MST /8 PM PDT/ Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Read Full Alert
Area
Parker Valley; Yuma; Joshua Tree NP West; Joshua Tree NP East; Imperial County Southwest; Salton Sea; Chuckwalla Mountains; Imperial County Southeast; Imperial County West; Imperial Valley; Chiriaco Summit; Palo Verde Valley; Chuckwalla Valley

Excessive Heat Warning

Excessive Heat Warning issued July 22 at 4:36AM PDT until July 24 at 11:00PM PDT by NWS Las Vegas NV

* WHAT...Dangerously hot and muggy conditions. Temperatures in the Western Mojave Desert, and Pahrump will range from 110 to 115. Death Valley National Park can expect temperatures 120 to 125. * WHERE...In California, Death Valley National Park and Western Mojave Desert. In Nevada, Western Clark and Southern Nye County. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Heat-related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Hot temperatures overnight will mean little relief from the daytime heat, especially in Death Valley where low temperatures may not fall below 100 degrees. Afternoon high temperatures will feel more oppressive than experienced a few weeks ago due to the increase in humidity.

Read Full Alert
Area
Death Valley National Park; Western Mojave Desert; Western Clark and Southern Nye County

Excessive Heat Warning

Excessive Heat Warning issued July 22 at 4:36AM PDT until July 24 at 11:00PM PDT by NWS Las Vegas NV

* WHAT...Dangerously hot and muggy conditions expected. Temperatures in the Colorado River Valley and around Lake Mead, Lake Mohave, and Lake Havasu will range from 112 to 118. Central and southern Mohave County including the Kingman area will range from 106 to 112. Cadiz and Morongo Basins will range from 110 to 117. * WHERE...Lake Mead National Recreation Area, Lake Havasu and Fort Mohave, Northwest Deserts, Morongo Basin, Cadiz Basin, and San Bernardino County-Upper Colorado River Valley. * WHEN...Until 11 PM PDT /11 PM MST/ Wednesday. * IMPACTS...Heat-related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Hot temperatures overnight will mean little relief from the daytime heat, especially in lower elevations of the Colorado River Valley, where low temperatures may not fall below 90 degrees. Afternoon high temperatures will feel more oppressive than experienced a few weeks ago due to the increase in humidity.

Read Full Alert
Area
Lake Havasu and Fort Mohave; Northwest Deserts; Lake Mead National Recreation Area; Morongo Basin; Cadiz Basin; San Bernardino County-Upper Colorado River Valley; Lake Mead National Recreation Area

Excessive Heat Warning

Excessive Heat Warning issued July 22 at 4:36AM PDT until July 24 at 11:00PM PDT by NWS Las Vegas NV

* WHAT...Dangerously hot and muggy conditions. Temperatures in the Las Vegas Valley, Mesquite and Moapa Valley 110 to 115. Eastern Mojave Desert, including Baker 112 to 117. * WHERE...In California, Eastern Mojave Desert. In Nevada, Las Vegas Valley, Northeast Clark County, and Southern Clark County. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Heat-related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Hot temperatures overnight will mean little relief from the daytime heat, especially in the Las Vegas Valley, where low temperatures may not fall below 90 degrees. Afternoon high temperatures will feel more oppressive than experienced a few weeks ago due to the increase in humidity.

Read Full Alert
Area
Eastern Mojave Desert, Including the Mojave National Preserve; Northeast Clark County; Las Vegas Valley; Southern Clark County
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