The Treasure Valley will enjoy another warm and sunny day Wednesday before an upper-level low brings the potential for isolated strong thunderstorms Thursday afternoon, followed by a clearing and warming trend that will deliver an outstanding weekend just in time for the official start of fall.
Spectacular weather gives way to isolated storms ahead of a nice weekend in Scott Dorval’s video forecast
Wednesday: Near-Perfect Fall Conditions
Wednesday will bring sunny skies and a high near 82 degrees, right at the normal high for mid-September in Boise. Light winds and dry conditions will make for an ideal day outdoors. This will be the last fully dry day before the next weather system arrives, so make the most of it.
The official start of astronomical fall, the autumnal equinox, arrives on Tuesday, September 22 at 8:29 p.m. MDT. The Treasure Valley is already experiencing the kind of crisp, clear, and comfortable weather that defines the best of the fall season, with temperatures right at seasonal normals and low humidity.
Thursday: Isolated Strong Thunderstorms Possible
The weather pattern will become more active Thursday as an upper-level low shifts eastward and moves inland from the Oregon coast. An associated jet streak will position itself across southwest Idaho, providing favorable dynamics for broad-scale ascent and increasing instability…