Area Forecast Discussion
Issued by NWS Boise, ID
Issued by NWS Boise, ID
976 FXUS65 KBOI 192017 AFDBOI Area Forecast Discussion National Weather Service Boise ID 217 PM MDT Wed Jun 19 2024 .SHORT TERM...Tonight through Friday night...Rapid warming to continue through Thursday. Latest models show slight instability along the NV/ID border Thursday afternoon and night, but too weak for thunderstorms. Slower warming expected Friday as a weak Pacific upper trough moves inland north of our CWA. Light diurnal winds through the period. .LONG TERM...Saturday through Wednesday...Hotter Saturday as the weak northern trough exits east and an upper ridge builds over our area with WSW-ly flow aloft. Still looks like around 100 degrees in the Treasure Valley Saturday afternoon, with 90s in other valleys and 80s in the mountains. A stronger upper trough from the Gulf of Alaska will move onto the BC coast Saturday night, with a surface cold front approaching northern Idaho. Instability ahead of the front may develop high-based thunderstorms north of Baker County Saturday night, but with lower levels staying dry storms would bring gusty winds but little or no rain. The upper trough will shear eastward across northern Idaho Sunday with little cooling reaching our CWA, i.e., highs still in the 90s in the valleys and 80s in the mountains. Hot, dry weather will continue through Wednesday, but models show a stronger Gulf of Alaska trough coming inland for a cooling trend late in the week. && .AVIATION...VFR. Some mid-level cumulus cloud development over high terrain this afternoon, dissipating by evening. Surface winds: E-SE 5-15 kt with gusts to 20 kt in the Lower Snake River Plain, then variable less than 10 kt after Thurs/03Z. Winds aloft at 10kft MSL: SW-SE 10-15 kt. KBOI...VFR with a few high clouds. Surface winds: SE 8-10 kt becoming variable less than 5 kt after Wed./22Z. && .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 SHORT TERM...LC LONG TERM....LC AVIATION.....SA