California Severe Flash Flood Warning | Effective 08/11/2026 18:46

Headline: 
Flash Flood Warning issued August 11 at 6:46PM PDT until August 11 at 9:45PM PDT by NWS Las Vegas NV
Event: 
Flash Flood Warning
Urgency: 
Immediate
Effective: 
August 11, 2026 - 6:46pm
Expires: 
August 11, 2026 - 9:45pm
Description: 
FFWVEF The National Weather Service in Las Vegas has issued a * Flash Flood Warning for... San Bernardino County in southern California... * Until 945 PM PDT. * At 646 PM PDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1 and 1.5 inches of rain have fallen. Additional rainfall amounts of 0.5 to 1 inch are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Radar indicated. IMPACT...Life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses. * Some locations that will experience flash flooding include... Cima, Kelso and Mountain Pass. This includes Interstate 15 in California between mile markers 158 and 175.
Instruction: 
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. In hilly terrain there are hundreds of low water crossings which are potentially dangerous in heavy rain. Do not attempt to cross flooded roads. Find an alternate route. Please report observed flooding to local emergency services or law enforcement and request they pass this information to the National Weather Service when you can do so safely.
Area Description: 
San Bernardino, CA
Forcast Office: 
NWS Las Vegas NV
Sender: 
w-nws.webmaster@noaa.gov