Sunrise 6:52 AM   Sunset 8:35 PM Moonrise 3:34 PM   Moonset 4:25 AM

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FXUS65 KBOI 190920 AFDBOI

Area Forecast Discussion National Weather Service Boise ID 320 AM MDT Fri Apr 19 2024

SHORT TERM
Today through Sunday night...Warming through Saturday as a Pacific upper ridge comes inland and over our CWA Mostly clear today and tonight then increasing high clouds Saturday. Low temperatures tonight 33 to 39 degrees in the southern Idaho agricultural valleys. Pacific cold front will bring a 20-40 percent chance of rain showers to northern-most zones Saturday night and clouds to remaining zones. Sunday will be clearing, windy, and cooler as an upper trough passes north of our CWA Clear and colder Sunday night with decreasing west winds. Lows in the 20s and 30s, with southern Idaho ag valleys between 32 and 38 degrees. Sunny, breezy, and cool Monday, then clear and not as cold Monday night.

LONG TERM
Monday through Friday...An upper level trough will move by to our north on Monday as an upper level ridge moves into the Pacific Northwest. This will keep temperatures near normal with dry conditions. The ridge will move overhead on Tuesday with temperatures warming around 10 degrees from Monday. The pattern will become more active Wednesday through Friday as an upper level trough approaches our area, although models differ in timing and strength. Ensembles favor keeping our area in the warm sector on Wednesday, with temperatures trending cooler Thursday and Friday as the trough moves inland. Precipitation chances will increase Wednesday through Friday to 20-50%, with the highest chances in the mountains. Even with the cooler air associated with the trough, snow levels are expected to remain above 5500-6000 ft MSL. Breezy conditions will also accompany the trough towards the end of the week.

AVIATION
VFR. Increasing high clouds this afternoon with mid-level cumulus developing over the higher terrain. Surface winds: variable less than 10 kt, becoming E-SE 5-15 kt after 19/15Z. Winds aloft at 10kft MSL: SW-NW 5-15 kt.

KBOI...VFR, mostly clear skies. Winds SE 5-10 kt, becoming variable less than 10 kt around 21Z this afternoon.

Weekend Outlook...VFR and high clouds Saturday. Clouds lowering but conditions mainly remaining VFR Saturday evening into Sunday, with isolated MVFR showers and mountain obscuration in Baker County and West Central ID. Decreasing clouds Sunday evening. Snow levels generally 5500-7500 ft MSL during showers. Surface winds: SW-SE 5-15 kt Saturday, and W-NW 10-25 kt Sunday.



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

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