California Severe Flash Flood Warning | Effective 08/11/2026 16:02

Headline: 
Flash Flood Warning issued August 11 at 4:02PM PDT until August 11 at 6:30PM PDT by NWS Las Vegas NV
Event: 
Flash Flood Warning
Urgency: 
Immediate
Effective: 
August 11, 2026 - 4:02pm
Expires: 
August 11, 2026 - 6:30pm
Description: 
At 402 PM PDT, Public has reported significant flooding along I-15 near Fort Irwin Road in Barstow. Between 1.5 and 2.5 inches of rain have fallen. Additional rainfall amounts of 0.5 to 1 inch are possible in the warned area. Flash flooding is already occurring. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Public reported flash flooding, radar indicated rainfall. IMPACT...Life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses. Some locations that will experience flash flooding include... Daggett and Nebo Center. This includes the following highways... Interstate 15 in California between mile markers 81 and 89. Interstate 40 in California between mile markers 2 and 11.
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