Sunrise 5:44 AM   Sunset 8:00 PM Moonrise 12:30 AM   Moonset 8:26 AM

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FXUS65 KBOI 282033 AFDBOI

Area Forecast Discussion National Weather Service Boise ID 233 PM MDT Sun Apr 28 2024

SHORT TERM
Tonight through Tuesday night...Westerly flow aloft continues today as a trough approaches the Pacific NW.
Continued breezy westerly winds this afternoon, with the strongest winds in the Magic Valley (20-30mph) before becoming light tonight. This trough will bring a cold front through the area late tonight into Monday morning and bring scattered rain and snow showers to the area. Precipitation will be limited in the lower valleys with a 10-30 percent chance, with a 70-90 percent chance over the mountains in northeast OR and the west central ID mountains. Snow levels will range around 5500-6500 feet MSL. Snow accumulations up to 2 inches on the highest peaks with this system above 7000 feet. Temperatures on Monday will be around 10-15 degrees below normal. The front will also bring strong westerly winds on Monday afternoon, where a wind advisory remains in effect for the Camas Prairie, Treasure and Magic Valleys for wind gusts up to 50 mph. The upper level trough will remain over the area on Tuesday, with continued cool conditions and breezy conditions during the afternoon. Snow showers will generally be focused over the higher terrain on Tuesday afternoon with snow levels 3500-4500 ft MSL.

LONG TERM
Wednesday through Sunday...The upper level trough will remain over the area on Wednesday as it is reinforced by another cold core system from the Gulf of Alaska. This system will move overhead on Wednesday morning with a chance of snow showers and snow levels around 2500-4000 feet. There is a potential for snow to the valley floors but the current forecast reflects ensemble mean. Wednesday will remain around 10-15 degrees below normal. Then slight ridging brings drier and warmer conditions on Wednesday and Thursday. Forecast confidence beyond Thursday is low as the ensembles do not have a good handle on the remainder of the extended period. The ensemble mean favors warmer and drier conditions with temperatures rising to around 5 degrees above normal by Saturday. However there is a chance of continued cool and unsettled conditions lingering over the weekend.

AVIATION
VFR. Isolated showers over the mountains north of KBKE- KMYL, then becoming scattered showers over the mountains late tonight into Monday, with mountain obscuration. Snow levels 5500-6500 ft MSL. Surface winds: W-NW 10-20 kt. Gusts to 30 kt east of KMUO, including KTWF/KJER, subsiding after sunset to variable 10kt, then becoming NW 15-25kt Monday afternoon with gusts up to 40kt near KMUO KJER KGNG KTWF. Winds aloft at 10kft MSL: W to SW 20-30 kt becoming NW after 21z/Mon.

KBOI...VFR. Surface winds: NW 5-10 kt, becoming NW 10-15kt Monday afternoon with gusts up to 30kt.

BOI WATCHES/WARNINGS/ADVISORIES
ID...Wind Advisory from noon to 7 PM MDT Monday IDZ014-016-028.
OR...None.

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Pendleton, OR,