Idaho: There will be general chance for showers and thunderstorms on Saturday mainly across southern districts and towards the Bitterroot spine. Minimum RHs on Saturday and Sunday will be at or below what they were on Friday. Mid-slope RH recovery will be poorer Sunday morning. An influx of clouds with another chance for showers and thunderstorms is possible on Sunday. The probability of a wetting rain ranges from 50 to 60 percent across Idaho County but only 20 to 30 percent probability towards the Palouse area through Monday morning. Generally mild and dry Monday. A relatively dry frontal system is possible on Tuesday that could bring northeast winds by Tuesday night.
Montana: Showers and thunderstorms are expected from the West Fork District to points east and southeast on Saturday. Instability does not look as high as Friday, so expect gusty winds, lightning and brief heavy rain. A more organized upper level wave will bring showers and thunderstorms to area Sunday. The highest probabilities for a wetting rain are centered over west-central Montana, generally 40 to 50 percent east and south of Missoula, 15 to 25 percent towards the Kootenai NF, and 10 to 30 percent in the Beaverhead-Deerlodge NF. A digging trough out of Canada will increase mid-level winds a bit on Monday, generally felt in the higher elevations across northwest Montana and also across southwest Montana. Warm and dry with gusty winds on Sunday and Monday in the Dillon District. An area wide wind shift to the northeast is possible Tuesday with a backdoor cold front with northeast winds continuing into Wednesday. Highest probabilities for wetting rain is over the Divide north of Avon into the Flathead NF with possible snow down to 6,000 feet.