A strong Pacific storm will begin to uncoil across Oregon, Washington and Northern California through the weekend, promising heavy rain and snow that will replenish water supplies but could also unleash destruction.

Fresh weather model data points to a wet weekend ahead for Northern California and the Bay Area. Forecasts are calling for significantly higher rainfall totals than previously predicted along with several feet of snow piling up in the Sierra by Sunday.

Snow continues to fall across central and southern Colorado on Thursday and transportation officials said the winter weather is shutting down roads and causing crashes. As of 10:15 a.m., eastbound Interstate 70 was closed between U.