National Weather Service United States Department of Commerce

Thunderstorms and Heavy Rains in the Appalachians

Multiple rounds of moderate to locally heavy rain will impact portions of the Appalachians and Mid-Atlantic, which may lead to flash flooding concerns. Thunderstorms with isolated severe wind gusts will be possible this afternoon from parts of the Southeast into the southern and central Appalachians. A multi-day heavy rain will pose a flash flood threat in New Mexico beginning Tuesday. Read More >

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Last Map Update: Mon, Sep 21, 2026 at 8:02:24 am PDT

Monday, September 21, 2026: Winds from the west gusting up to 35 MPH will create hazardous conditions for small craft today until early Tuesday morning. Exercise increased caution if recreating at San Luis Reservoir.
Warmer than average temperatures return by the middle of the week. There is a high probability of highs at least 95 degrees in many San Joaquin Valley locations on Wednesday until Friday.
Monday, September 21, 2026 @ 4:00 AM PDT - There is a slight (10-20%) chance of thunderstorms for the Sierra Nevada this afternoon and evening, mainly in the higher elevations.

 

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