Areas of Excessive Rainfall and Severe Thunderstorm Potential Today

Widespread showers and thunderstorms are forecast for much of the Eastern and Southern U.S. today. Isolated severe thunderstorms may produce large hail and damaging winds over eastern North Carolina and eastern Florida. In the Northeast U.S. heavy rainfall through Saturday may result in isolated flash flooding and minor flooding on rivers and streams. Flood Watches are in effect. Read More >

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Last Map Update: Fri, May 9, 2025 at 7:52:22 am PDT

Watches, Warnings & Advisories

National Weather Service San Francisco Bay Area, CA

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National Weather Service Los Angeles, CA

Heat Advisory

Dense Fog Advisory

Small Craft Advisory

Early May Temperature Warm-Up

Cold Water in Area Lakes and Rivers

Minor Fire Risk this Weekend

Strong Winds in High Sierra and Mojave Desert

A building area of high pressure over central California later this week will create a warming trend for the region. There is a likely chance (70-90%) for highs on Saturday to exceed 95 degrees in the San Joaquin Valley, which are ten to fifteen degrees above average for the date. There is also a moderate chance (45-65%) for highs to exceed 100 degrees. This level of heat has a moderate risk for heat-related illnesses to those sensitive heat.

Air temperatures are expected to reach into the upper 90s later this week. While it may be tempting to cool down in the area lakes and rivers, keep in mind that water temperatures can be much colder than air temperatures due to the water originating from snowmelt runoff. It takes less than 15 minutes to lose your dexterity in water below 60 degrees! Always wear a life vest, always bring a life preserver with you, and do not go into closed rivers, streams, and lakes.

Warming temperatures this weekend will cause relative humidity values to gradually decrease, and when combined with drying fuels, have a minor risk for conditions favorable for grass fire development. Reduce fire risk by not using lawn mowers to cut dry grass and avoid dragging parts or chains from your vehicle.

A breakdown of the ridge in the late weekend period will allow an upper level trough to deepen along the Pacific coast into Monday. The strong southwesterly flow around the center of the trough will result in strong wind gusts at the surface along the Sierra crests and in the Mojave Desert and Slopes. This image shows the probability for maximum wind gusts to exceed 55 miles per hour next Monday, May 12, 2025.