A colossal storm is threatening to bring severe weather to much of California this week and could impact travel over the Grapevine. Here's what to know.

A powerful storm is dropping drenching rain on flood-prone Southern California and heavy snow on the state’s mountains. It’s the first act of a storm that will unleash a severe thunderstorm outbreak,

A cross-country tornado snow blitz threatens 100 million Americans with the ‘most severe’ storm outbreak of the year. ‘Dangerous, damaging and life-threatening’ weather conditions spanning half a million square miles will smash the US into mid-month.

The Southern California area has one more day of sunny conditions before a set of storms will bring moderate to heavy rain and snow over the next couple of days, forecasters say.

Wednesday will end the stretch of sunny, spring-like weather for Northern California as heavy snow, rain and wind are expected.

At 2:01 p.m. on Wednesday, the NWS Sacramento CA released an updated winter storm watch valid from Thursday 11 p.m. until Friday 11 p.m. The watch is for Shasta Lake and Mountains Southwestern Shasta County to Western Colusa County as well as Shasta County.