Wet weather will continue into the start of the week. Warm air will move the rain/snow line to around 6000 feet, meaning valleys and some passes at lower elevation will see rainfall through Tuesday. Overnight lows will mostly remain above freezing with Monday's highs in the mid to upper 40s.
High Wind Warnings are in place for Gallatin, Madison, Glacier, and Pondera counties through Tuesday evening. 30 to 40 mph winds with gust over 50 mph are expected and will make for potentially dangerous driving conditions. Windy conditions are also likely from Butte to the Bitterroot and Missoula valleys, but less severe than east of the divide.
Winds will keep temperatures quite warm for the next few days, with Bozeman and Missoula standing a good shot at reaching 50 degrees at some point in the next few days.
Rain will be the other weather story Monday into Tuesday, as heavy rain will impact the Bitterroot Mountains, the Swan Range, Mission Range, and the Glacier Park area. With a couple of inches of rainfall possible in the mountains between Sunday night and Tuesday, the risk of avalanches, rock slides, and mud slides, will go up. Standing water could be an issue on US 12 over Lolo Pass and on I-90 between St. Regis and the state line.
Snow will remain an issue Sunday night for Lost Trail, Lolo, and Marias passes, where Winter Weather Advisories will remain in place until noon Monday.
There will be a brief break from wet weather on Wednesday, but more valley rain and mountain snow will be in the forecast Thursday through the start of the weekend.