The National Weather Service has issued a Significant Weather Advisory for Yosemite National Park through 3:45pm.
A strong thunderstorm located nine miles southeast of Yosemite Valley is moving west at about ten mph.
Hail of up to a half inch in diameter, wind gusts of forty mph, lightening and heavy downpours are all expected with this storm.
Locations affected include Glacier Point, Snow Flat, Ostrander Lake, Tenaya Lake and Yosemite Valley.
If threatening weather approaches, take shelter in a sturdy building.
Other strong thunderstorms may develop across the Sierra Nevada through sunset.
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