Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

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Last Map Update: Fri, Aug 28, 2026 at 12:32:23 pm PDT

Watches, Warnings & Advisories

National Weather Service San Francisco Bay Area, CA

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National Weather Service Los Angeles, CA

Extreme Heat Warning

Red Flag Warning

Heat Advisory

Small Craft Advisory

Air Quality Alert

Valley Dry Lightning Risk

Friday Thunderstorm Probabilities

Friday Rainfall Outlook

Dry Lightning

Remnants from Tropical Strom Iselle crossing over California today presents a 5-10% probability of thunderstorms across the San Joaquin Valley. Any thunderstorms that develop have a risk of causing lightning strikes away from areas of precipitation, potentially starting new fires.

An influx of moisture from Tropical Storm Iselle will bring rain and thunderstorms this Friday⛈️. The best chances of rain are in the foothills and the Sierra Nevada, but there is up to a 20% chance of at least 0.10" of rain in Fresno ☔. Remember that when thunder roars to go indoors!

Moisture from former Tropical Storm Iselle will bring chances for rain today, mainly along the Sierra Nevadas and foothills. The highest probability for rain will be above 2,000 feet, though a 20-30% probability for at least a trace of rain will extend down to the San Joaquin Valley.

10% probability of Dry Lightning across the central valley today. Thus, there is a moderate risk of new fire starts if lightning strikes dry vegetation.