The National Weather Service has issued a winter weather advisory from Thursday night through noon Oct. 20 for the higher elevations of the Sierra mountains.

Snow accumulations may occur on Interstate 80 over Donner Pass and on Highway 50 over Echo Summit, with chain controls possible after midnight Thursday. Gusty winds may also reduce visibility.

Caltrans is reminding motorists that wet and slippery roadways reduce tire traction, especially at high vehicle speeds. Hydroplaning can result in loss of driver control.