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Forecast Discussion for Boise, ID
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000 FXUS65 KBOI 190304 AFDBOI Area Forecast Discussion National Weather Service Boise ID 904 PM MDT Thu Apr 18 2024 .DISCUSSION...A dry northwest flow aloft will be accompanied by clear to mostly clear skies through Friday. Light winds and mostly clear skies will allow for another cold morning with lows in the 20s and 30s, including pockets of sub-freezing temps in the Treasure Valley. Temperatures rebound to within a couple degrees of normal in the afternoon. No updates. && .AVIATION...VFR. Mostly clear skies. Surface winds: variable less than 10 kt. Winds aloft at 10kft MSL: variable 5-15 kt. KBOI...VFR, mostly clear skies. Winds variable less than 10 kt. Weekend Outlook...VFR and high clouds Friday and Saturday. Clouds lowering Saturday evening into Sunday, with scattered MVFR showers and mountain obscuration developing in the Baker County and West Central ID mountains. Improvement by Sunday evening. Snow levels generally 6000-7500 ft MSL during showers. Surface winds: variable 10 kt or less Friday, SW-SE 5-15 kt Saturday, and W-NW 10-25 kt Sunday. && .PREV DISCUSSION... SHORT TERM...Tonight through Saturday night...A dry NW flow on Friday will give way to a shortwave ridge Saturday. Tonight will see seasonably cold temperatures across the region again with a frost or freeze possible in the Snake Plain. Probability of a freeze remains in the 40-60% range with the higher probabilities in typically colder/sheltered spots. Periods of high clouds are possible Friday, especially across southern zones, otherwise the ridge will keep clear skies over the region through much of Saturday, which will be the warmest day. Clouds increase Saturday night as the ridge axis shifts eastward. Moisture aloft and a weak upper trough will introduce a slight chance of showers across the e-central Oregon and w-central Idaho mountains Saturday night. Temperatures on Saturday will reach about 10 degrees above normal. LONG TERM...Sunday through Thursday...A weak shortwave trough will pass over northern Idaho on Sunday, bringing a slight chance of rain and high elevation snow showers to the West Central Mountains and Baker County, OR. An upper level ridge will begin to build into the region on Monday, bringing a warming trend to the area. Temperatures will be slightly above normal through Monday, with highs reaching 10-15 degrees above normal on Tuesday. The Boise metro area currently has a 30-40% chance of breaking 80F on Tuesday. Model agreement on the storm track starts to dissipate by Wednesday, when deterministic and ensembles vary the speed of the incoming upper level low from British Columbia. Some advance it quickly, bringing a slight chance of precipitation with cooler temperatures as early as Wednesday morning, while others delay it to Wednesday night. Regardless of timing, there is agreement in a cooler and wetter pattern by the end of the long term period. && AVIATION...VFR. Mostly clear skies with a few high level clouds through the day. Surface winds: E-SE 5-15 kt except E-SE 10-20 kt with gusts to 30 kt in the Snake River Valley, then variable less than 10 kt after 19/04Z. Winds aloft at 10kft MSL: variable 10-20 kt. KBOI...VFR, some mid level cumulus clouds this afternoon. Winds SE 10-15 kt with gusts to 25 kt, becoming N-NW or variable 4-7 kt at 19/00Z. Weekend Outlook...VFR and high clouds Friday and Saturday. Clouds lowering Saturday evening into Sunday, with scattered MVFR showers and mountain obscuration developing in the Baker County and West Central ID mountains. Improvement by Sunday evening. Snow levels generally 6000-7500 ft MSL during showers. Surface winds: variable 10 kt or less Friday, SW-SE 5-15 kt Saturday, and W-NW 10-25 kt Sunday. && .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...BW AVIATION.....BW SHORT TERM...DG LONG TERM....SA |
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