207 FXUS65 KBOI 052353 AFDBOI Area Forecast Discussion National Weather Service Boise ID 553 PM MDT Fri Jun 5 2026 .UPDATE...Updated aviation discussion. && .KEY MESSAGES... - Cold frontal passage will bring gusty winds Saturday and Sunday. - High temperatures Sunday will be 10 degrees below normal with rain and snow showers possible in the west-central Idaho mountains. - Showers Tuesday and Wednesday will bring additional precipitation, mainly to the mountains. && .SHORT TERM /Through Sunday Night/... Issued 300 PM MDT FRI JUN 5 2026 A shortwave trough entering the Pac NW will push a pair of cold fronts through the region this weekend. The first front will push across SE Oregon this evening, and SW Idaho overnight. This will bring gusty winds to 35 mph at the typically windy sites along the I-84 corridor between Baker City and Twin Falls. The frontal passage will be dry and result in temperatures 10-15 degrees cooler than today. Breezy conditions will continue during the day Saturday, as the main upper trough moves into the interior NW. A second cold front will accompany the trough passage Saturday night into Sunday, bringing another round of gusty winds, stronger than tonight. Gusts to 35 mph are expected in the Snake Plain east of Mountain Home on Sunday. The upper trough will support showers over the mountains of Baker County and the w-central Idaho mountains. Snow levels will briefly drop to between 4500-5500 feet Sunday morning. Light accumulation, less than an inch, is possible above 7000 feet through early morning. Showers will taper off Sunday afternoon as the trough exits east. Sunday is the coolest day with high temperatures around 70 in the lower elevations and mid-50s in the mountains (about 10 degrees below normal). && .LONG TERM /Monday through Friday/... Issued 300 PM MDT FRI JUN 5 2026 Cool and unsettled through Thursday with temperatures around 10-15 degrees below normal. Another trough will move into the Pacific NW on Monday afternoon. This system will bring unsettled conditions to the area with showers and afternoon thunderstorms through Wednesday. Generally 0.10-0.25 inch of precipitation across the valleys, with 0.75 to 1.25 inch precipitation over the mountains. A ridge will build over the West Coast on Friday into the weekend with a gradual warming trend next weekend. && .AVIATION /00Z Saturday through Sunday/... Issued 550 PM MDT FRI JUN 5 2026 VFR and increasing clouds tonight. Surface winds: NW 10-20kt this evening. Winds aloft at 10kft MSL: SW 15-25kt. KBOI...VFR. NW 5-10kt, 18 kt gusts weaken overnight. Weekend Outlook...VFR. Surface winds light overnight and NW 10-20kt with gusts up to 25 kt Sat afternoon. W-NW 5-15kt Sun afternoon with gusts in Idaho up to 30 kt. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...Fire Weather Watch from Sunday afternoon through Sunday evening for IDZ424-426. OR...None. && $$ www.weather.gov/Boise Interact with us via social media: www.facebook.com/NWSBoise www.x.com/NWSBoise AVIATION.....JM SHORT TERM...DG LONG TERM....KA