Soaking rains of up to two inches have fallen in the mountains around the Wood River Valley (Sun Valley). There is the possibility for some flash flooding with some of the heavier showers overnight.
Before sunrise Monday, heavier rain just ahead of the remnants of Hillary will push north into southern Idaho and eastern Oregon. The flash-flood potential could be highest from 5 am to 11 am Monday in the Treasure Valley. The flood threat for the mountains of western Idaho and northeast Oregon could continue into Monday night and possibly Tuesday. Monday will be a humid day with some of the highest dewpoint temperatures ever recorded in our area making it feel more like the tropics. Valley temperatures will remain in the 70s Monday.
In mountain communities along highways, 95, 55, 21, 17(Banks to Lowman Road), and 75 there is the potential for rock and mudslides which could cause some road closures.
Gusty southeast winds will develop in southern Idaho around 8 am Monday. Gusts of 30-40 mph are likely across the area through Monday afternoon. In the higher terrain there could be isolated gusts 50-60 mph.
The core of this tropical system will race northward leaving behind lighter wind by Monday evening. Periodic heavy showers may taper off Monday night but more heavy showers are likely in the West Central mountains on Tuesday which could aggravate any existing flooding concerns.
Finally sunshine returns on Wednesday with very pleasant conditions and a high temperature of 83 in Boise.
