Severe Thunderstorm and Tropical Storm Bertha Impacts

Numerous severe thunderstorms are expected across a broad region from the Ohio Valley to the Mid-Atlantic and Northeast States today into tonight. Swaths of damaging wind gusts are expected and some tornadoes are possible. Bertha is expected to bring tropical storm conditions to portions of the Gulf Coast from the Florida Panhandle westward to southeastern Louisiana later today and Wednesday. Read More >

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Last Map Update: Tue, Jul 21, 2026 at 1:26:31 pm PDT

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Thunderstorms will develop in Mono county today before progressing northward. Slower storm motions and heavy rain will result in flooding being the greatest threat today. Remember, never drive through flooded roadways!

Deeper monsoonal moisture and daytime heating will increase shower and thunderstorm chances again Tuesday afternoon and evening. Storms that form over the eastern Sierra and Tahoe region into western NV from the Reno-Carson area southward to Mineral County are more likely to be slow moving or redeveloping over similar areas, increasing the risk for heavy rainfall capable of producing flash flooding.

Don't underestimate the power of water! 6 inches of fast moving water can carry an adult with 12 inches moving a small car. Never drive through flooded roadways!

Daily chances for showers and thunderstorms through at least Wednesday of this week. Stay safe during thunderstorms by going indoors or in a hard-topped vehicle.