BOZEMAN – A very unstable atmosphere is developing Wednesday through Friday over the entire region. Low-pressure over Spokane, WA will slowly spin through the region over the next the couple of days and with a strong High-pressure ridge over central Canada a classic convergence zone is setting up with plenty of lift and possible slower moving thunderstorms.
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This pattern couple produce rainfall rates of 1”-2”+ per hour with the greatest threat in steep terrain along the Continental Divide and Rocky Mountain Front.
The National Weather Service has a FLOOD WATCH up west of the divide extending northward through this evening.
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Flash flooding is possible and could washout roads in the mountains, but it could produce flooding in poor drainage areas for lower valleys.
Another round of slow-moving thunderstorms with pockets of very heavy rainfall are possible Thursday afternoon and evening especially east of the divide.
The Low-pressure system currently over Spokane, WA will spin into northern Montana Thursday into Friday and produce wrap around showers and thunderstorms some could linger into Friday morning or early afternoon.
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Once this storm passes out of the region a cooler NW flow aloft will bring near normal temperatures to the state by the weekend into early next week.