Clear skies overnight allowed temperatures to plummet, with lows reaching -20° in Stanley, 20° in Mountain Home, and 24° in Boise. Temperatures rebounded into the mid 40s on Friday afternoon under bright sunshine.
Tonight, clear skies will persist as temperatures drop into the low to mid 20s. A gusty east-southeast breeze will develop overnight into Saturday for the Snake River Plain. Clouds will increase as a system moves northeast from central Oregon to northern Idaho by Saturday evening, bringing scattered light snow showers to the Central Mountains mainly overnight.
On Sunday, snow showers will return to the mountains in the afternoon as another system arrives. Isolated showers can be expected in the valley during the day, with more numerous showers expected overnight. The most significant system is projected to arrive on Monday night, bringing gusty winds and steady rainfall lasting into Tuesday for the Treasure Valley.
By Tuesday morning, mountain valleys could see 3-7 inches of snowfall, with heavier amounts of 8-16 inches above 6000 feet. Sunday night and Monday night into Tuesday will likely bring the most significant impact to travel in the mountains.
