If you've been enjoying the warm stretch Helena has had this week, Thursday is your last good day to make the most of it. An upper-level ridge has been keeping temperatures pleasant and skies clear, but a strong trough moving in from the Pacific Northwest will bring a hard reset to the region by the weekend, with forecasters calling for significantly colder temperatures, rain, and snow.
Friday will still be manageable, though winds will pick up ahead of the incoming system — something to keep in mind given that a Fire Weather Watch is already in effect through Thursday evening for the surrounding national forest lands. Once the trough arrives Saturday, the pattern change is expected to be substantial. Details on snowfall totals and how low temperatures will drop were still being refined as of Thursday morning.
For Helena residents, the weekend shift is a reminder that October in the valley can turn quickly. Anyone with outdoor projects, firewood to stack, or livestock to prepare for should plan to wrap up work Friday.