A storm system is currently over the British Columbia coast. It is rotating spokes of energy and moisture in a counterclockwise circulation. One such spoke is bringing evening showers and storms to southwest Montana around Bozeman and Butte. These will be ending at sunset or midnight at the latest, although a lingering shower cannot be ruled out overnight. Elsewhere, partly cloudy skies in Missoula and Kalispell. Lows ranging from 50 to 55.
Another spoke of energy will rotate into the region Tuesday afternoon and evening. A few showers and storms are possible, mainly from Missoula north to the Kalispell area. A slight chance in Butte and Bozeman. Highs in the upper 70s in Kalispell to the 80s elsewhere.
The strongest spoke of energy will arrive Wednesday afternoon. There is a good chance of showers and storm across west central and northwest Montana around Missoula and Kalispell, where strong storms are possible. Just a chance in Butte and Bozeman. Some of the storms may contain damaging winds, small hail and lightning.
A strong cold front will usher much cooler air into the region Wednesday night. Highs will drop to the upper 60s in Kalispell on Thursday with the 70s elsewhere.
A big warming trend will begin this weekend and last into next week. Highs will warm to the 80s and low 90s on Sunday and the upper 80s to mid 90s Monday.