Area Forecast Discussion
Issued by NWS Boise, ID
Issued by NWS Boise, ID
815 FXUS65 KBOI 231957 AFDBOI Area Forecast Discussion National Weather Service Boise ID 157 PM MDT Thu May 23 2024 .SHORT TERM...Tonight through Saturday night...Mostly cloudy, breezy, and cool weather today behind yesterday`s departed trough will become mostly clear and cold tonight with light winds. Weak upper ridge will pass through Friday with max temps 6-10 degrees higher than today. Clouds will increase in Baker County and northern Harney County as the next upper trough approaches from the BC coast. The trough will bring a 60-90% chance of showers to our northern CWA mountains Friday night and Saturday morning, 30-60% chance to eastern Oregon and southwest Idaho mountains, and 20-40 percent chance to the Snake Basin and southern Idaho valleys. Rain amounts will be generally less than .10 inch, except up to .25 inch in northern mountains. Snow level will lower to 5500-6000 feet but snowfall will be minimal, generally less than one inch. Saturday will be breezy and cooler again as the upper trough shifts east. Saturday night should be clearing and cool with decreasing west winds. .LONG TERM...Sunday through Thursday...The departing trough will leave us with weak ridging Sunday, and then SW flow aloft will move in Monday. This SW flow is ahead of a deep and strong trough off the coast, and will lead to rapidly warming temperatures and dry conditions. Temps will warm up to a few degrees below normal Sunday, then 5-10 degrees above normal Monday, and around 20 degrees above normal Tuesday. The aforementioned trough off the coast will move inland by Wednesday, lowering heights and therefore cooling things down a bit for Wed and Thu. The trough will also produce a chance (10-30%) of showers across the north Tue night through Thursday. Only light precipitation amounts are forecast at this time. && .AVIATION...VFR. Decreasing clouds through the afternoon, then increasing clouds after midnight. Showers will develop Friday aft/eve, and there`s a slight chance of thunderstorms. Surface winds: W to NW 5-15 kt, except 10-20 kt with gusts to 30 kt for KMUO/KJER/KTWF through 23/24Z, becoming light and variable by midnight. Winds aloft at 10k ft MSL: variable 10 kt or less, becoming W around 10 kt by 24/12Z. KBOI...VFR. NW winds 5-15 kt, then SE 5-10 kt after sunset. Weekend Outlook...Mostly VFR. Showers beginning Friday afternoon in E Oregon, spreading into SW ID Friday evening, and continuing through Saturday. Potential for aft/eve thunderstorms both days, but only in the ID side Saturday. MVFR/IFR possible in precip, along with mountain obscuration. VFR and dry Sunday. Snow levels generally 6500-7500 ft MSL. Surface winds E-SE 5-15 kt Friday, then W-NW 10-20 kt with gusts to 25-30 kt Saturday. VFR Sunday with winds W-NW 5-15 kt. && .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....SP AVIATION.....SP