Apr 4, 2012; 12:13 PM ET
The cold trough that is centered in the Northwest now slowly moves east after tomorrow. Between now and then additional rain and snow showers are likely with even thunder in spots during the afternoon and evening hours. Snow level s will be low between 1,000 and 2,000 feet. Where thunderstorms do occur expect small hail. Friday is still somewhat unsettled though not quite as much as the next 24 hours. There should be fewer showers west of the Cascades but otherwise scattered showers of rain and snow continue to be likely.
Farther south the cold trough will bring below normal temperatures through Friday in all of California along with some gusty winds. The strongest winds are likely on the Central Coast, the west side of the San Joaquin Valley and through north-south passes Santa Barbara through Los Angeles County. There are likely to be a few snow showers tomorrow over the northern Sierra but these will cause no travel problems or much accumulation.
Over the Holiday Weekend the trough moves east. Meanwhile a ridge pushes up from the south across the Great Basin as another cold trough drops south through the east-central Pacific. The trough develops offshore far enough to keep most of its precipitation over water Saturday and if there are a couple of showers Sunday they will be on parts of the Oregon and extreme northwest California coast. Otherwise expect temperatures to modify with the biggest warming coming for central and southern California and Arizona with above normal temperatures taking over and sunshine much of the time.
Eventually that Pacific trough moves east. Any showers early next week will confined to parts of western Oregon and Washington but then could spread south and east Wednesday and Thursday. It does look likely that much of California could eventually get some rain and snow by Wednesday night and Thursday.
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