Area Forecast Discussion
Issued by NWS Boise, ID
Issued by NWS Boise, ID
116 FXUS65 KBOI 171607 AFDBOI Area Forecast Discussion National Weather Service Boise ID Issued by National Weather Service Pendleton OR 1007 AM MDT Thu Jul 17 2025 .DISCUSSION... Visible satellite shows smoke aloft over most of the area this morning. Smoke is reaching the ground at Burns OR, where the visibilities were down to 4 mi earlier this morning. Expect hazy skies to continue today from wildfires in central and southwest OR. Temperatures will be around 5-10 degrees warmer than Wednesday, with low 100s in the Snake River Plain today and Friday. Isolated thunderstorms expected along the NV border today and Owyhee Mountains and in central OR west of Harney County. Main threats with the thunderstorms will be gusty erratic outflow winds up to 45 mph. && .AVIATION... VFR. Patchy smoke aloft, MVFR conditions still possible for SE OR through morning. High density altitude during the afternoon and evening along the ID/NV border and near KTWF/KJER. Thunderstorm outflow gusts may reach up to 40 kts. Surface winds: light and variable becoming NW 8-12 kt, wind gusts to 20 kts over SE OR and central ID mnts. Winds aloft at 10 kt MSL: W 10-20 kt. KBOI VFR. Smoke to persist through morning, with near surface smoke increasing through afternoon. MVFR conditions not expected at this time. Surface winds: variable through morning. KBOI... Weekend Outlook... && .PREV DISCUSSION... SHORT TERM...Today through Saturday night...Today and Friday, an upper level ridge over the southwestern US will shift to the north. This will bring hotter temperatures, with highs around 5 degrees above normal. This will place high temperatures in the lower valleys in the mid 90s to around 100 degrees.. An uptick in mid-level moisture will accompany this pattern as the flow aloft becomes more southwesterly. This will bring a 20% chance of showers and thunderstorms to the higher terrain along the ID/NV border each afternoon and evening, with lesser chances (10% or lower) elsewhere. Storms may produce gusty winds 40-50 mph. Meanwhile, an upper level trough over the Pacific Northwest will start to move inland on Saturday. This will bring a few degrees of cooling to the area. The trough will enhance west to southwest flow aloft today through Saturday, allowing breezy conditions with gusts 15-30 mph, highest across the central ID mountains, to develop each afternoon as winds aloft mix down to the surface. Regional fires will continue to send smoke into our area at times over the next couple of days. LONG TERM...Sunday through Thursday...The upper level trough will persist over the Pacific Northwest early next week, then slowly move east by the middle of next week. This will bring temperatures a few degrees below normal, warming back to near normal by Thursday. The core of the trough and most accompanying precipitation should remain to our north, but a slight chance (15-25%) of showers and thunderstorms will develop over northern areas Monday and Tuesday, with lower chances south. The trough will keep afternoon winds breezy through the period. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...None. OR...None. && Discussion...KA Aviation...CH Short Term...ST Long Term...ST $$ www.weather.gov/Boise Interact with us via social media: www.facebook.com/NWSBoise www.x.com/NWSBoise