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The threat of afternoon and evening thunderstorms will continue each day into the holiday weekend over the higher elevations of the Sierra Nevada. The thunderstorm threat will expand into the Sierra Foothills Friday and Saturday, with even a few storms possible in Merced County on Friday. Also, a slight chance of Thunder is possible for the San Joaquin valley Fresno County and northward as early as Thursday afternoon and evening. In addition to cloud to ground lightning, thunderstorms can bring strong, gusty winds and locally heavy downpours. Hikers and campers and others planning outdoor activities in the affected areas should keep a watchful eye on the sky each afternoon and be prepared to move to a place of safety when you hear thunder.
Cooler temperatures and isolated thunderstorms are expected this weekend over the Sierra Nevada. Snow levels will run about 8000 feet, possibly lower within shower activity. Light snow accumulation, or possible small hail could accumulate along the Tioga Pass and other high altitude roads. Tioga Pass tends to get busy as soon as it opens for the season, especially during a Holiday weekend. Motorists are advised to prepare for winter-like conditions, slower traffic and possible road closures. Check with Caltrans for current road conditions at (800) 427-ROAD and continue to monitor our webpage at for updates to the forecast. Hikers and campers should be prepared for the change in weather conditions.


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On April 19th, 2017, all Western Region (WR) NWS Weather Forecaast Offices (WFOs), and Center Weather Service Units (CWSUs)  migrated to a new layout on the front page of their web home pages. This change is in response to a required web infrastructure consolidation. The change will provide office-to-office consistency because the layout of the home page will be set across the Region. But where will everything be on this new site? We try to answer these and any other questions you may have about our new site here.