A Winter Storm Warning is in effect for the Southern Sierra Nevada and Kern County mountains above 6,000 feet from late Tuesday night until 4 PM PST Thursday afternoon. A Winter Storm Warning means that significant snow accumulations could make travel exceptionally hazardous or impossible. The majority of this snow will fall Wednesday afternoon and Wednesday evening. Up to a foot of snow is possible along the Southern Sierra Nevada crest. If you plan to travel, consider alternate strategies. If you must travel, remember to carry tire chains, plenty of food, a good deal of water, and warm clothing in your vehicle. Yosemite National Park will be temporarily closing Tioga and Glacier Point roads, starting at 3 PM PST Tuesday afternoon due to this incoming storm system. These closures may persist for several days or longer. For additional information on road conditions, including closures or delays, call Caltrans at 1-800-427-7623.

An area of low pressure aloft will be in the vicinity of Southern California tonight into Thursday. This atmospheric disturbance will be responsible for the first precipitation event of the late starting 2019-2020 wet season for much of central California. All precipitation below 6,000 feet will be in the form of rain. A Winter Storm Warning is in effect for the mountains above 6,000 feet. The majority of this precipitation will fall Wednesday during the day. The greatest amounts of precipitation will fall over the mountains and the southern end of the San Joaquin Valley. The San Joaquin Valley north and west of Fresno will likely remain dry.