NWS Forecast Office Los Angeles, CA

A cold storm system is expected to move across Southern California Wednesday through Thursday night, potentially bringing some rain, mountain snow and a chance of thunderstorms. Coast and valleys could expect up to a quarter of an inch, whereas in the mountains a quarter to half an inch are possible. If isolated thunderstorms develop, small hail and slightly higher amounts could be possible. In addition, one to three inches of snow above 2500 ft. but up to 6 inches will be possible over the eastern San Gabriel mountains. Snow levels could drop as low as 1500 ft. bringing some dusting to minor accumulations across those lower elevations. Some of the potential impacts are hazardous winter driving conditions on mountain roads and highways, including the I5 near Grapevine.