San Bernardino Warnings, Watches and Advisories

When a severe thunderstorm warning is issued, the storm may produce damaging winds, large hail, dangerous lightning, and heavy rain. In some cases, heavy rainfall produced by a severe storm can also lead to flash flooding. 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.

Flash Flood Warning issued August 9 at 5:54PM PDT until August 9 at 7:30PM PDT by NWS San Diego CA

FFWSGX The National Weather Service in San Diego has issued a * Flash Flood Warning for... Northeastern San Diego County in southwestern California... * Until 730 PM PDT. * At 554 PM PDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include... Hwy 78 Between Banner And S2, Hwy 78 Between S2 And Borrego Springs Rd, Hwy S2 Between Hwy 79 And Hwy 78 and Shelter Valley.

Special Weather Statement issued August 9 at 5:27PM PDT by NWS San Diego CA

At 527 PM PDT, Doppler radar was tracking a strong thunderstorm near Hwy 78 Between Banner And S2, moving northwest at 5 mph. HAZARD...Wind gusts up to 50 mph and half inch hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible. Locations impacted include... Hwy 78 Between Banner And S2, Julian, Hwy 78 Between S2 And Borrego Springs Rd, Warner Springs, Ranchita, Hwy 79 Between Santa Ysabel And Warner Springs, Hwy S2 Between Hwy 79 And Hwy 78, Hwy 78 Between Ramona And Santa Ysabel, Hwy S22 Between Ranchita And Borrego Springs, Hwy 79 Between Warner Springs And Oak Grove, Banner, Wynola, Santa Ysabel, Santa Ysabel Indian Reservation, Shelter Valley, and Los Coyotes Indian Reservation.

Heat Advisory issued August 9 at 2:52PM PDT until August 9 at 10:00PM PDT by NWS Eureka CA

* WHAT...Temperatures of 90 to 101 will produce moderate HeatRisk on Sunday. * WHERE...Southwestern Interior Mendocino. * WHEN...Until 10 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Hot temperatures are expected to continue into Sunday.

Heat Advisory issued August 9 at 2:52PM PDT until August 9 at 10:00PM PDT by NWS Eureka CA

* WHAT...Temperatures of 100 to 110 will produce moderate to major HeatRisk on Sunday. * WHERE...Northern Mendocino Interior, Lake County, and Southeastern Interior Mendocino. * WHEN...Until 10 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Hot temperatures are expected to continue into Sunday.

Heat Advisory issued August 9 at 2:52PM PDT until August 9 at 10:00PM PDT by NWS Eureka CA

* WHAT...Temperatures of 100 to 110 will produce moderate to major HeatRisk on Sunday. * WHERE...Humboldt Interior. * WHEN...Until 10 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Hot temperatures are expected to continue into Sunday.

Heat Advisory issued August 9 at 12:53PM PDT until August 9 at 8:00PM PDT by NWS San Diego CA

* WHAT...High temperatures in the mid 80s to upper 90s below 6500 feet expected. * WHERE...Riverside County Mountains. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses.

Heat Advisory issued August 9 at 12:53PM PDT until August 9 at 8:00PM PDT by NWS San Diego CA

* WHAT...Temperatures up to 98. * WHERE...San Diego County Mountains. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses.

Heat Advisory issued August 9 at 12:53PM PDT until August 9 at 8:00PM PDT by NWS San Diego CA

* WHAT...High temperatures in the mid 80s to mid 90s below 6500 feet expected. * WHERE...San Bernardino County Mountains. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses.

Heat Advisory issued August 9 at 12:53PM PDT until August 9 at 8:00PM PDT by NWS San Diego CA

* WHAT...High temperatures in the low 90s east of Interstate 5. High temperatures in the mid-90s in the Santa Ana mountains. * WHERE...Orange County Inland Areas and Santa Ana Mountains and Foothills. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses.

Heat Advisory issued August 9 at 12:53PM PDT until August 9 at 8:00PM PDT by NWS San Diego CA

* WHAT...Temperatures up to 95. * WHERE...San Diego County Valleys. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses.

Heat Advisory issued August 9 at 12:53PM PDT until August 9 at 8:00PM PDT by NWS San Diego CA

* WHAT...Temperatures up to 103. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses.

Extreme Heat Warning issued August 9 at 12:53PM PDT until August 9 at 8:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with high temperatures of mid 100s to around 112 expected. * WHERE...Coachella Valley, San Diego County Deserts, and San Gorgonio Pass near Banning. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Extreme Heat Warning issued August 9 at 12:53PM PDT until August 9 at 8:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with temperatures of 100 to 107 expected. * WHERE...Apple and Lucerne Valleys. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Coastal Flood Advisory issued August 9 at 12:24PM PDT until August 12 at 11:00PM PDT by NWS San Diego CA

* WHAT...Minor coastal flooding expected during the evening high tides. * WHERE...San Diego County Coastal Areas and Orange County Coastal Areas. * WHEN...From 6 PM Monday to 11 PM PDT Wednesday. * IMPACTS...Flooding of low lying parking lots, parks, and roads. * ADDITIONAL DETAILS...High tides of 7.2 to 7.5 will peak each evening between 7:30PM-10PM due to astronomical high tides.

Extreme Heat Warning issued August 9 at 11:13AM MST until August 9 at 8:00PM MST by NWS Phoenix AZ

* WHAT...Dangerously hot conditions. Afternoon temperatures 106 to 113. Major Heat Risk. * WHERE...Imperial County, including the Imperial Valley and El Centro. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.

Extreme Heat Warning issued August 9 at 11:13AM MST until August 9 at 8:00PM MST by NWS Phoenix AZ

* WHAT...Dangerously hot conditions. Afternoon temperatures 99 to 111. Major Heat Risk. * WHERE...Chuckwalla Mountains, Chiriaco Summit, and Joshua Tree National Park. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.

Extreme Heat Warning issued August 9 at 11:13AM MST until August 10 at 8:00PM MST by NWS Phoenix AZ

* WHAT...Dangerously hot conditions. Afternoon temperatures 107 to 114. Major Heat Risk. * WHERE...In Arizona, Parker Valley and Yuma. In California, Chuckwalla Valley, Imperial County West, Imperial Valley, Palo Verde Valley, and Salton Sea. * WHEN...Until 8 PM MST /8 PM PDT/ Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.

Coastal Flood Advisory issued August 9 at 10:28AM PDT until August 13 at 2:00AM PDT by NWS San Francisco CA

* WHAT...Up to 1.6 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways. * WHERE...Bayshore locations along the San Francisco Bay, San Pablo Bay, and Monterey Bay. * WHEN...Until 2 AM PDT Thursday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. * ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide is expected to be 1.5 ft above normal (7.34 ft MLLW) at 9:02 PM Sunday 8/9, 1.5 ft above normal (7.36 ft MLLW) at 10:01 PM Monday 8/10, 1.6 ft above normal (7.44 ft MLLW) at 10:57 PM Tuesday 8/11, and 1.3 ft above normal (7.14 ft MLLW) at 11:49 PM Wednesday 8/12. These predictions include both astronomical tides and roughly 3-6 inches of additional water mainly from a combination of thermal expansion and accumulated sea level rise since the tidal datum was established (1983- 2001). High tide varies up to 90 minutes earlier or later along the Pacific Coast and through the San Francisco Bay, respectively.

Extreme Heat Warning issued August 9 at 10:02AM PDT until August 10 at 8:00PM PDT by NWS Hanford CA

* WHAT...Dangerously hot conditions with multiple days of Major to Extreme Heat Risk. Highs 106 to 112 degrees. * WHERE...Indian Wells Valley, Mojave Desert, and Mojave Desert Slopes. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events, especially those with little overnight relief from the heat. * ADDITIONAL DETAILS...Dangerously hot conditions with high temperatures up to 112 degrees. Overnight lows will range from 75 to 80 degrees.

Extreme Heat Warning issued August 9 at 10:02AM PDT until August 10 at 8:00PM PDT by NWS Hanford CA

* WHAT...High temperatures up to 110 degrees and Major Heat Risk today and Monday. * WHERE...Mariposa-Madera Lower Sierra. Includes Mariposa, North Fork, Oakhurst, Coarsegold, and El Portal. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Hot temperatures and limited overnight relief may cause heat illnesses. * ADDITIONAL DETAILS...Afternoon high temperatures of 102 to 110 degrees will occur until Monday, with the hottest temperatures expected today and mainly for elevations around 3,000 feet and lower. Overnight lows will generally only fall into the mid 60s to mid 70s with little overnight relief.

Extreme Heat Warning issued August 9 at 10:02AM PDT until August 10 at 8:00PM PDT by NWS Hanford CA

* WHAT...High temperatures up to 108 degrees and multiple days of Major Heat Risk. * WHERE...West Side Mountains north of 198. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Hot temperatures and limited overnight relief may cause heat illnesses. * ADDITIONAL DETAILS...Afternoon high temperatures of 102 to 108 degrees will occur through Monday. Overnight lows will generally only fall into the mid 60s to mid 70s with little overnight relief.

Extreme Heat Warning issued August 9 at 10:02AM PDT until August 10 at 8:00PM PDT by NWS Hanford CA

* WHAT...The Heat Advisory has been replaced with an Extreme Heat Warning. High temperatures of 105 to 110 degrees and multiple days of Major Heat Risk. Hottest temperatures expected today. * WHERE...San Joaquin Valley and adjacent foothills, Lake Isabella, and the Kern River Valley. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Afternoon high temperatures of 105 to 110 degrees will occur until Monday, with the hottest temperatures expected today. Overnight lows will generally only fall into the mid 60s to mid 70s with little overnight relief.

Extreme Heat Warning issued August 9 at 7:29AM PDT until August 9 at 8:00PM PDT by NWS Las Vegas NV

* WHAT...Dangerously hot conditions with highs 110 to 120 degrees across the Mojave Desert. Highs 95 to 105 degrees across most of the southern Great Basin and Arizona Strip. Little to no overnight relief is expected, particularly in the Mojave Desert where lows of 80 to 95 degrees are forecast. This will result in Major-to-Extreme Heat Risk. * WHERE...Portions of northwest Arizona, southeast California, and south central and southern Nevada. * WHEN...Until 8 PM PDT /8 PM MST/ this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Heat Advisory issued August 9 at 7:29AM PDT until August 9 at 8:00PM PDT by NWS Las Vegas NV

* WHAT...Hot conditions expected with highs 80 to 90 degrees above 8000 feet and 90 to 100 degrees below 8000 feet. This will result in Moderate Heat Risk. * WHERE...In California, Eastern Sierra Slopes and White Mountains of Inyo County. In Nevada, Sheep Range and Spring Mountains-Red Rock Canyon. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses.

Extreme Heat Warning issued August 9 at 7:29AM PDT until August 10 at 8:00PM PDT by NWS Las Vegas NV

* WHAT...Dangerously hot conditions with highs of 110 to 115 in the Las Vegas Valley, Pahrump, Moapa Valley, and the Colorado River Valley, and up to 120 in Death Valley. Warm overnight temperatures will result in little relief overnight. * WHERE...Lake Mohave, Lake Mead, Lower Colorado River Valley / Lake Havasu, Death Valley National Park, Northeast Clark County, Western Clark and Southern Nye County, and Las Vegas Valley. * WHEN...Until 8 PM PDT /8 PM MST/ Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Heat Advisory issued August 9 at 12:24AM PDT until August 9 at 10:00PM PDT by NWS Sacramento CA

* WHAT...High temperatures of 101 to 107 and low temperatures of 65 to 80 expected, with Moderate to Major HeatRisk. * WHERE...The Sacramento and San Joaquin Valleys, Foothills, Coast Range, and Sierra north of Highway 50. * WHEN...Until 10 PM PDT this evening. * IMPACTS...ot temperatures may cause heat illnesses, especially anyone without effective cooling and/or adequate hydration. * ADDITIONAL DETAILS...Hot temperatures continue today, with areas of Major HeatRisk. Hottest temperatures and warmest overnight lows expected in the northern Sacramento Valley and Sierra foothills thermal belts.

Heat Advisory issued August 8 at 11:53PM PDT until August 10 at 8:00AM PDT by NWS Reno NV

* WHAT...High temperatures of 97 to 102 degrees with overnight lows of 55 to 70 degrees. Widespread Moderate to Major HeatRisk. * WHERE...In California, Lassen-Eastern Plumas-Eastern Sierra Counties and Surprise Valley California. In Nevada, Northern Washoe County and Greater Reno-Carson City-Minden Area. * WHEN...Until 8 AM PDT Monday. * IMPACTS...Heat related illnesses will be more likely, especially for those spending extended periods outdoors, in poorly cooled indoor spaces, or who are sensitive to heat.

Heat Advisory issued August 8 at 9:42PM PDT until August 9 at 10:00PM PDT by NWS San Francisco CA

* WHAT...Daytime highs in the mid 90s to low 100s. Nighttime lows in the mid 60s in the hills to low 80s (especially in the higher elevations). * WHERE...The Santa Clara Valley and Eastern Hills, The East Bay Hills and Valleys, Western Sonoma County Hills, The Santa Cruz Mountains, Interior Monterey County and the Santa Lucia Range, Most of San Benito County and the Cholame Hills in Southeast Monterey County, North Bay Interior Mountains, and Southern Salinas Valley/Arroyo Seco and Lake San Antonio. * WHEN...Until 10 PM PDT Sunday. * IMPACTS...This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. Impacts possible in some health systems and in heat-sensitive industries. * ADDITIONAL DETAILS...The hottest locations will be across the far interior.

Coastal Flood Advisory issued August 8 at 1:22PM PDT until August 13 at 12:00AM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Minor coastal flooding expected during the evening high tides. * WHERE...Malibu Coast and Los Angeles County Beaches. * WHEN...From 6 PM Monday to midnight PDT Wednesday night. * IMPACTS...Flooding of sea water is likely, around the time of high tide, over vulnerable low-lying coastal areas such as parking lots, beaches, and walkways. Significant damage to roads or structures is NOT expected. * ADDITIONAL DETAILS...Coastal flooding impact concerns will peak each evening between about 8 PM and 10 PM due to astronomical high tides of 7.3 to 7.5 feet.

Coastal Flood Advisory issued August 8 at 1:22PM PDT until August 13 at 12:00AM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Minor coastal flooding expected during the evening high tides. * WHERE...Santa Barbara County Southwestern Coast and Santa Barbara County Southeastern Coast. * WHEN...From 6 PM Monday to midnight PDT Wednesday night. * IMPACTS...Flooding of sea water is likely, around the time of high tide, over vulnerable low-lying coastal areas such as parking lots, beaches, and walkways. Significant damage to roads or structures is NOT expected. * ADDITIONAL DETAILS...Coastal flooding impact concerns will peak each evening between about 8 PM and 10 PM due to astronomical high tides of 7.3 to 7.5 feet.

Coastal Flood Advisory issued August 8 at 1:22PM PDT until August 13 at 12:00AM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Minor coastal flooding expected during the evening high tides * WHERE...Ventura County Beaches. * WHEN...From 6 PM Monday to midnight PDT Wednesday night. * IMPACTS...Flooding of sea water is likely, around the time of high tide, over vulnerable low-lying coastal areas such as parking lots, beaches, and walkways. Significant damage to roads or structures is NOT expected. * ADDITIONAL DETAILS...Coastal flooding impact concerns will peak each evening between about 8 PM and 10 PM due to astronomical high tides of 7.3 to 7.5 feet.

Extreme Heat Warning issued August 7 at 9:11AM PDT until August 9 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Hot daytime conditions with high temperatures between 98 and 106 common. * WHERE...The Cuyama Valley. * WHEN...Until 8 PM PDT Sunday. * IMPACTS...There is a high risk for dangerous heat illness, especially for sensitive groups like the very young, the very old, those without air conditioning, and those active outdoors.

Heat Advisory issued August 7 at 9:11AM PDT until August 9 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Very warm temperatures of 90 to 105 degrees expected. * WHERE...Eastern San Gabriel Mountains, Interstate 5 Corridor, San Luis Obispo County Interior Valleys, San Luis Obispo County Mountains, Santa Barbara County Interior Mountains, Santa Susana Mountains, Southern Ventura County Mountains, and Western San Gabriel Mountains and Highway 14 Corridor. * WHEN...Until 8 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses.

Extreme Heat Warning issued August 7 at 9:11AM PDT until August 9 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Dangerously hot conditions with temperatures 102 to 110. * WHERE...Antelope Valley and nearby foothills. * WHEN...Until 8 PM PDT Sunday. * IMPACTS...There is a high risk for dangerous heat illness, especially for sensitive groups like the very young, the very old, those without air conditioning, and those active outdoors.

Heat Advisory issued August 7 at 9:11AM PDT until August 9 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Very warm temperatures of 90 to 100 degrees expected. * WHERE...A portion of southwest California. * WHEN...From 10 AM Saturday to 8 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses.

Extreme Heat Warning issued August 7 at 9:11AM PDT until August 9 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Dangerously hot daytime conditions with high temperatures between 95 and 105 common, except locally up to 108 in the hottest locations. * WHERE...Northern Ventura County Mountains. * WHEN...Until 8 PM PDT Sunday. * IMPACTS...There is a high risk for dangerous heat illness, especially for sensitive groups like the very young, the very old, those without air conditioning, and those active outdoors.