Hanford, Calif. – The Sierra Nevada could see an active weather pattern on Thursday as thunderstorms threaten higher elevations, according to the National Weather Service (NWS) in Hanford. Forecasters are monitoring a 10 to 15 percent chance of storm development, with the greatest activity expected above 7,000 feet, stretching from Yosemite National Park to Sequoia National Park.
Key Hazards
The primary concern remains cloud-to-ground lightning, which can quickly spark new wildfires in the region’s dry terrain. The rugged landscape of the Sierra, already prone to fast-spreading fires, makes this a serious risk. In addition, gusty and erratic winds could accompany the storms, complicating fire suppression efforts and creating sudden hazards for outdoor recreationists.
Brief but intense bursts of heavy rain and small hail are also possible, leading to slick mountain passes and reduced visibility. Motorists traversing routes like Tioga Pass and Mather’s Pass are advised to exercise extreme caution during the storm window.
Impact on Communities and Recreation
Communities nestled within the Sierra, including Yosemite Valley, Shaver Lake, and Lake Thomas Edison, could experience localized storm cells during the afternoon and evening. While widespread rainfall is not expected, even isolated thunderstorms can produce rapid changes in weather conditions.
Visitors to campgrounds, hiking trails, and lakes are strongly urged to take precautions. The Weather Service advises people to move indoors at the first sound of thunder and avoid high ridges, tall trees, and open water, all of which can become dangerous in lightning-prone conditions.
Safety Guidance
Outdoor enthusiasts are reminded that thunderstorms in the Sierra can form quickly and with little warning. Officials recommend the following precautions:
- Monitor alerts throughout the day via weather apps or NOAA radios.
- Seek shelter indoors if thunder is heard, even if skies appear partly clear.
- Avoid exposed terrain, including mountain peaks and ridges.
- Stay clear of water bodies, such as lakes or rivers, during lightning activity.
Travelers should be prepared for sudden road closures, muddy trail conditions, and reduced visibility if storms intensify.
Outlook
The threat of thunderstorms is expected to diminish by late Thursday night, closing the window for severe weather. However, forecasters caution that if monsoonal moisture lingers into the weekend, additional advisories could follow.
For now, those heading into the Sierra are urged to stay weather-aware and plan for rapidly shifting conditions. The combination of dry fuels, lightning, and erratic winds makes Thursday a potentially hazardous day for both residents and visitors in California’s mountain country.
