Weather Service Report


797 
FXUS65 KBOI 230235
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
835 PM MDT Wed Sep 22 2021

.DISCUSSION...A few showers and thunderstorms developed in our 
CWA this evening as a Pacific upper trough came in. They produced
minimal rain but generated wind gusts to 35 mph. At 800 PM MDT 
skies have already cleared in eastern Oregon and will do the 
same in western Idaho overnight. Current forecast is in good 
shape. No updates planned. 

&&

.AVIATION...VFR. A cold front moving through the area this evening 
with isolated showers and thunderstorms from KMYL to KMUO moving 
east. Clearing overnight. Surface winds: NW 5-15kt, with brief gusts 
up to 30kts along the cold front. Winds aloft at 10k feet MSL: NW 10-
20kt, turning NE 10-20kt by 15z/Thu.

&&

.PREV DISCUSSION...
SHORT TERM...Tonight through Friday night...Upper level trough
moving over the area tonight will support a few showers and 
thunderstorms over the central Idaho mountains, and southwest 
highlands, moving east of the Magic Valley by morning. Increased 
northwesterly flow will dominate behind that system on Thursday,
as the trough moves eastward and a ridge develops along the West
Coast.  That will bring some breezy conditions to the mountains 
overnight, and then into the Upper Treasure Valley and Magic 
Valley on Thursday. Temperatures should drop a bit on Thursday
behind the trough and associated weak cold front, ending up a few
degrees below normal in most areas. The ridge will push over the 
area on Friday with most areas returning to near normal 
temperatures with clear skies.

LONG TERM...Saturday through Wednesday...Above normal temperatures 
will persist through the weekend under dry zonal flow aloft. A deep 
upper trough will move onto the Pacific Northwest coast on 
Monday, spreading showers over the Intermountain West early next 
week. Models continue to exhibit a large spread in solutions 
beyond the weekend, so the forecast for Monday and beyond remains 
low confidence. Temperatures will fall below normal as the upper 
trough moves over the region, and breezy winds will accompany the 
system.

&&

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

&&

$$

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DISCUSSION...LC
AVIATION.....KA
PREV SHORT TERM...TB
PREV LONG TERM....AL

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