Area Forecast Discussion
Issued by NWS Boise, ID
Issued by NWS Boise, ID
040 FXUS65 KBOI 270257 AFDBOI Area Forecast Discussion National Weather Service Boise ID 857 PM MDT Fri Jul 26 2024 .DISCUSSION...Skies were smoky this evening, and there are even a few real clouds out there. Smoke is expected to continue tonight and tomorrow, with harmful levels in many areas. We have at least 8 detectable smoke plumes originating in our CWA. In addition, smoke from the Park Fire is moving over the region at a higher elevation, acting like a layer of cloud in some areas. All this smoke helped keep max temperatures down below what was forecast. Showers and isolated thunderstorms are in the forecast Saturday, with the highest chance in Twin Falls and Jerome counties. No changes will be made at this time. && .AVIATION...Widespread MVFR with local IFR in smoke from wildfires. Slight (<25 percent) chance of showers/thunderstorms south of a KBNO- KJER line and in central ID (east of KMYL) after Sat/18Z. Surface winds: light and variable less than 10 kt becoming northwest 5-15 kt after Sat/18Z. Gusts to 40 kt near thunderstorms. Winds aloft at 10kft MSL: W-SW 5-15 kt. KBOI...Periods of MVFR in smoke, with reductions to IFR possible. Northwest surface winds less than 10 kt. Sunday Outlook...Wildfire smoke with areas of MVFR and local IFR conditions. Winds generally W-NW 5-15 kt. && .PREV DISCUSSION... SHORT TERM...Tonight through Sunday night... An upper trough over the Pacific NW and northern Rockies will continue to bring near normal temperatures to the region through the weekend. A weak upper low off the California coast will get pulled northeast over Oregon and Idaho Saturday. Moisture is limited but there will be a chance (15-30%) of thunderstorms Saturday afternoon and evening near the Nevada border and over eastern portions of the Payette and Boise NF. Sunday looks dry across the forecast area. Breezy westerly winds Saturday and Sunday afternoon as a weak shortwave moves across northern Idaho. Smoke will continue to impact the region with southwest to west winds advecting smoke over the area from northern California fires in addition to our local fires over eastern Oregon and southwest Idaho. LONG TERM...Monday through Friday... Next chance of precipitation (15-20%) will be Monday night/Tuesday generally north of a line from around Burns to McCall as another weak Pacific trough sweeps across the region. This will kick westerly winds up again for breezy conditions Monday and Tuesday. The great basin high is expected to rebuild late next week for a return to above normal temperatures Thursday and Friday with triple digit heat in the lower valleys. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...None. OR...None. && $$ www.weather.gov/Boise Interact with us via social media: www.facebook.com/NWSBoise www.twitter.com/NWSBoise DISCUSSION...SP AVIATION.....BW SHORT TERM...TL LONG TERM....TL