A snowstorm will develop Wednesday night in south-central Idaho then push slowly south and east spreading from Blaine County into the Magic Valley and southeast Idaho on Thursday before ending mid to late morning Friday.
In the meantime, clouds overspread southwest Idaho on Wednesday as a low-pressure system enters the Pacific Northwest. In the McCall area, rain showers will change to snow showers Wednesday late morning before reaching the Treasure Valley as rain showers before sunset. Snow levels will hover around 4000-4500 feet. McCall will see minimal if any snow accumulation.
Rain should end in Boise late Wednesday night. Precipitation will move east but could back in from east to west as close as Mountain Home later Thursday. Boise will be windy, cold, and dry on Thursday with a sunny to partly cloudy sky. Winds will gust to 35 mph so the wind chill will make it feel like 30s even though the temp will reach 47.
As the storm strengthens, snow will accumulate in central Idaho east of Pine, ID, and in the Magic Valley as well as southeast Idaho as Thursday progresses.
I-84 through the Magic Valley could be very snowy and slick as the sun comes up Thursday with melting as the temperatures warm during the day. 2"-4" of snow is expected in the Magic Valley. Snow showers will continue for the Magic Valley on Thursday and accumulating snow will continue from Burley to Pocatello and Idaho Falls as well as south to Snowville, UT, and Salt Lake City.
Some of the worst travel conditions will be from the Magic Valley to the Wood River Valley (Sun Valley) and from the Magic Valley to eastern Idaho and Salt Lake City, UT.
The Blue Mountains in northeast Oregon will see minimal impact from this storm with rain & snow showers on Wednesday.
As the sun sets Thursday night more slick roads will develop in the valleys from Twin Falls east. Snow showers will end before midday Friday in southeast Idaho.
Temperatures will be very seasonable in the Treasure Valley on Thanksgiving day, reaching 47°. Highs will only climb into the mid to upper 30s in the Magic Valley.
Heavy snow is expected in portions of Wyoming and Montana. Expect winter driving conditions over Monida Pass. Meanwhile, western parts of Idaho will stay dry with little travel impact.
If you are headed to the Boise State football game on Friday, expect, blustery and very cold conditions despite a sunny sky.
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