Fresno, California – Strong afternoon thunderstorms could spark lightning and drop small hail across California’s Sierra Nevada on Wednesday, with the greatest risk centered between Yosemite and Sequoia National Parks.
According to the National Weather Service in Hanford, there is a 15–20% chance of isolated thunderstorms forming between 11 a.m. and 8 p.m. PDT, mainly over the higher elevations. Any storms that develop may bring brief heavy rain, dangerous cloud-to-ground lightning, gusty winds, and small hail.
The impacted area stretches from Yosemite Valley through Kings Canyon to Sequoia National Park, where hikers and park visitors are urged to use caution. Thunderstorms could form rapidly, especially near Tioga Pass, Mammoth Lakes, and remote areas of the Sierra Crest. Lightning strikes remain a primary hazard for outdoor recreation, and erratic wind gusts could affect driving along CA-41 and CA-180.
Officials advise anyone hearing thunder or seeing lightning to seek shelter immediately and wait 30 minutes after the last rumble before resuming outdoor activities.
Storms are expected to taper off by nightfall, but additional updates may follow if storm chances increase. Stay weather-aware if you’re traveling in the Sierra through Wednesday evening.
