An assortment of precipitation —snow, freezing rain, rain — is on its way to Southwest Idaho.
A winter storm watch is in place starting at 5 a.m. Thursday and continuing into Friday afternoon for the lower Treasure Valley and eastern Oregon, including Weiser, Ontario and other areas that have been hardest hit by recent snowstorms, the National Weather Service reports.
“Technically it extends to the Ada-Canyon County border, but really it’s concentrated closer to the Oregon border,” NWS meteorologist Dave Groenert said Wednesday.
The series of snowstorms won’t be as heavy as other recent storms, but it will be prolonged, he said, especially in the Weiser and Ontario areas, where temperatures will stay cold enough for precipitation to continue as snow through much of Friday.
In Ada and Canyon counties, the snow will yield to rain late Thursday into Friday morning, with a small chance of freezing rain in the mix, he said. Rain will prevail through the weekend, with Boise-area temperatures in the low 40s.
Forecasts call for a total of 1 to 2 inches in Ada County and 1 to 3 inches in Canyon County, Groenert said. Between 2 and 4 inches are expected in the hardest-hit Valley areas, he said, noting that forecasters have modified that prediction since the warning was initially posted late Tuesday, anticipating 3 to 6 inches in areas around Weiser and Ontario, which already have crippling snow loads. In the mountains of Central Idaho and eastern Oregon, accumulations will be closer to 10 inches.