Sunrise 6:25 AM   Sunset 8:57 PM Moonrise 5:30 AM   Moonset 9:18 PM

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FXUS65 KBOI 082023 AFDBOI

Area Forecast Discussion National Weather Service Boise ID 223 PM MDT Wed May 8 2024

SHORT TERM
Tonight through Friday night...Continuing through Thursday, a persistent northeasterly flow aloft prevails across the region, driven by an upper-level low situated over the Northern Plains. This atmospheric setup maintains the potential for isolated showers this afternoon in areas, including the Boise Mountains, Upper Treasure Valley east of Mountain Home, Western Magic Valley, and southern Twin Falls County. Elsewhere, expect partly cloudy skies to persist into Thursday. Breezy conditions will persist across the area until early evening, particularly east of Boise from Mountain Home through Glenns Ferry, with gusts reaching up to 40 MPH before diminishing by sunset.

A gradual shift towards warmer and drier conditions is anticipated as an upper-level ridge expands eastward into the northern Rockies. However, the presence of a cut-off low over the four-corners region inhibits the eastward movement of the ridge over the Intermountain West, resulting in the warmest temperatures remaining west of the divide. Thursday and Friday are expected to feature mostly clear skies and lighter winds across most of the forecast area, with the exception being south-central Idaho on Thursday afternoon, where northeasterly flow may trigger isolated showers in the Western Magic Valley and Southern Twin Falls.

Temperatures are forecasted to rise to about 10 degrees above today's highs on Thursday, which is approximately 3 to 4 degrees above normal. An additional 5 to 7 degrees of warming is expected on Friday, with temperatures reaching the upper 70s in the lower valley.

LONG TERM
Saturday through Wednesday...High confidence in much warmer and drier conditions this weekend through the middle of next week as an upper ridge builds across the Pacific Northwest. High temperatures will be 5 to 15 degrees above normal during this period, with many locations reaching the 80 degree mark Sunday and Monday. Dry conditions will also prevail, with exception to weak instability developing on Sunday and Monday leading to a very low chance (5-10%) of isolated afternoon thunderstorms.

AVIATION
VFR. Virga/very light showers possible south and east of KBOI. Skies clearing overnight. Sfc winds: W-N 10-20 kt with gusts to 25 kt, except 15-25 kt with gusts to 35 kt from vicinity KMUO SE to KJER/KTWF. Winds at 10k ft MSL: NE 10-25 kt.

KBOI...VFR with decreasing mid and high clouds. Sfc winds: 10-20 kt with gusts to 25 kt this afternoon. Becoming light and variable overnight.

BOI WATCHES/WARNINGS/ADVISORIES
ID...None.
OR...None.

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