FXUS65 KBOI 222018

AFDBOI



Area Forecast Discussion

National Weather Service Boise ID

218 PM MDT Sun Mar 22 2026



.KEY MESSAGES...

- Warm, slightly above normal temperatures and dry conditions will

  continue through the middle of next week.



- Another cold front will move through the region midweek, 

  bringing mountain showers and slightly cooler temperatures.



&&



.SHORT TERM /Through Tuesday Night/...

A ridge of high pressure will continue to build back over the 

region through Monday. This will keep a relatively cool zonal 

flow mostly to our north. While tonight will feel noticeably 

cooler with lows reaching near or below freezing in many 

locations, Monday highs will remain above seasonal normals.



By Tuesday, an atmospheric river associated with a low pressure

system off the British Columbia coast will begin to transport

moisture toward the Pacific Northwest. This system will attempt

to push colder air and precipitation into southeast Oregon and

southwest Idaho. However, the persistent ridge to our south will

keep most of the moisture well north of the area. The higher

terrain of Baker County and the West Central Mountains of Idaho

have the best chance (30%) for any precipitation Tuesday. Snow

levels will remain high, generally between 7000 and 8000 feet

MSL, keeping any accumulations light and limited to the highest

peaks. Expect unseasonable warmth to continue through the end of

the period.



&&



.LONG TERM /Wednesday through Sunday/...

Warm weather will continue on Wednesday ahead of a cold front 

which is expected to arrive on Wednesday evening. The front will

bring a 40 to 50 percent chance of precipitation late Wednesday

through early Thursday across the northern half of our forecast

area with snow levels briefly falling to around 5000 feet. It 

looks like the front will pass through without bringing any 

precipitation to the southern half of the forecast area. Breezy 

northwest winds behind the front will bring in colder air and 

temperatures will be be near seasonal normals on Thursday. Most 

forecast models indicate that an upper level ridge will rebuild 

over the western US again on Friday with the ridge strengthening

into the weekend. Our forecast for southwestern Idaho and 

southeastern Oregon responds to that scenario and shows dry 

weather with a warming trend starting on Friday. Temperatures 

will rebound to around 10 degrees above normal on Friday and 

continue warming to about 15 degrees above normal by Saturday 

and Sunday.



&&



.AVIATION /18Z Sunday through Monday/...

Issued 1135 AM MDT SUN MAR 22 2026 VFR with SCT-BKN high cirrus

clouds will prevail across southwestern Idaho and southeastern 

Oregon through Monday. Surface winds will generally be westerly 

at less than 10 kts across the area this afternoon, becoming 

light and variable tonight and on Monday. Winds aloft at 10 Kft:

West 10 to 15 kts.



KBOI...VFR with light northwesterly surface winds less than 10 

kts today, becoming southeasterly at 3 to 6 kts tonight.



&&



.BOI WATCHES/WARNINGS/ADVISORIES...

ID...None.



OR...None.



&&



$$



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SHORT TERM...JDS

LONG TERM....JB

AVIATION.....JB