Heavy Rain in the Southern Appalachians; Heat Continues in the West; Monitoring Tropical Storm Erin

Heavy to excessive rain falling over the southern Appalachians may bring areas of flooding into Wednesday. Hot temperatures are in place through Wednesday across parts of the western U.S. and New England. Tropical Storm Erin is forecast to become a Hurricane by late this week as it moves westward across the central Atlantic Ocean. Monitor forecasts for any Puerto Rico or U.S. East Coast impacts. Read More >

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Last Map Update: Tue, Aug 12, 2025 at 9:54:19 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

Red Flag Warning

Heat Advisory

Small Craft Advisory

Heat Advisory

Today's Weather Outlook

A Heat Advisory is in effect for northeast California, Surprise Valley, and western Nevada until 9 AM Wednesday. High temperatures are expected to range from 95 to 105 degrees, with overnight lows between 65 and 72 degrees in the hottest valleys. These conditions will provide little overnight relief, increasing the risk of heat-related illness, especially for sensitive groups and those without adequate cooling. Avoid strenuous outdoor activities during the hottest part of the day, drink plenty of water, and take breaks in air-conditioned spaces.

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Heavy Rain in the Southern Appalachians; Heat Continues in the West; Monitoring Tropical Storm Erin

NWS Forecast Office Reno, NV