BOZEMAN – Mostly dry weather pattern to continue into Wednesday with another chilly night ahead but warming up to or slightly above the 30 year mean temperatures Wednesday afternoon.
A disturbance with subtropical moisture lifting on the backside of a high-pressure ridge will begin to increase cloud cover Thursday morning. As surface temperatures increase the atmosphere will become slightly unstable by Thursday afternoon and scattered showers and thunderstorms are likely into Thursday evening.
Some of this monsoonal moisture could linger over western and SW Montana into Friday but the chance for showers and thunderstorms looks low with just a few isolated rumbles Friday afternoon and evening mostly along the continental divide.
LABOR DAY WEEKEND:
Overall, the long holiday weekend looks mostly warm and dry. High pressure will be the dominant weather pattern over Montana and that should produce near to slightly above normal temperatures.
There are some forecast models that show the next weather maker, a Pacific Low, sliding down the Canadian coast into the Pacific NW Monday afternoon. How will this break down our blocking High-pressure ridge is a question we will continue to try an answer as we analyze updated forecast model runs in the next couple of days.
I included 7 day forecast graphics for Bozeman, Butte, Dillon, and West Yellowstone above.