Dangerous Heat in the West; Coastal Flooding & High Rip Current Risk through the Weekend on the East Coast; Flash Flooding Concerns in the Southeast and Southwest

A dangerous, record heat wave continues across portions of the West through Tuesday. High rip current risk and dangerous surf continue through the weekend. There are flash flooding concerns through the weekend for portions of the Southeast and Southwest. Read More >

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Last Map Update: Sat, Aug 23, 2025 at 12:28:48 pm PDT

Watches, Warnings & Advisories

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National Weather Service San Francisco Bay Area, CA

National Weather Service San Joaquin Valley, CA

Extreme Heat Warning

Heat Advisory

Flood Advisory

Flood Watch

Hydrologic Outlook

Thunderstorm Chances Today

Flash Flood Watch Today

Heat Advisory Through Sunday AM

We're expecting widespread thunderstorm chances today. Threats will mainly include frequent lightning, heavy rain, small hail, and flooding. Storms could initiate as early as noon today and will likely populate along the same areas, allowing for the risk for flash flooding.

The Heat Advisory has been extended for eastern Lassen County, northwest and west central NV, now in effect from noon Friday until 9 AM Sunday. The Heat Advisory remains in effect for far western NV (including Reno, Carson City, Minden areas) and Mineral-southern Lyon counties from noon Friday until 9 AM Saturday. Moderate risk of heat-related illness for those sensitive to heat without protective action. Hot daytime highs with warm overnight lows, bringing little relief overnight. Avoid strenuous outdoor activities between 10 am and 7 pm, and stay hydrated by drinking plenty of water.

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Dangerous Heat in the West; Coastal Flooding & High Rip Current Risk through the Weekend on the East Coast; Flash Flooding Concerns in the Southeast and Southwest

NWS Forecast Office Reno, NV