Weather alerts for the NWS Boise ID forecast area

000
FXUS65 KBOI 281046
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
446 AM MDT Wed Oct 28 2026

.UPDATE...Updated aviation discussion.

&&

.KEY MESSAGES...
- Dry through Thursday, with near normal temperatures. 

- Precipitation chances increasing across higher terrain Friday
  afternoon. Becoming widespread Saturday afternoon. 

- A drying and warming trend will set in Monday, through at 
  least midweek.

&&

.SHORT TERM /Through Friday Night/...
Issued 1253 AM MDT WED OCT 28 2026
Following the departing shortwave, a drying and clearing trend will 
continue this morning. These clearing skies will allow for good 
radiational cooling; which, when combined with the recent 
precipitation, will allow for the development of fog/freezing 
fog this morning (especially in sheltered valleys). 
Temperatures this afternoon will generally be in the 50s in the
low elevations, and 40s in the Oregon high desert and higher 
Idaho Basins. As flow aloft backs to be out of the southwest, 
thanks to a deepening low off the west coast, a warming trend 
will set in Thursday afternoon (highs around 5 degrees warmer 
than today). Before this, clear overnight skies tonight allow 
for cooler low temps. The majority of lower elevations will 
reach near or below freezing Thursday morning, with lows of 
10-20 degrees in the Oregon high desert and higher Idaho basins.


A weak shortwave rotating through this low will bring an increase of 
high cloud cover Thursday. Another consequence of this shortwave 
will be increasing precipitation chances early Friday over the 
central Idaho mountains. The southwesterly flow aloft will keep snow 
levels high and snow accumulations low, with a dusting to an inch of 
snow expected above 6kft.

&&

.LONG TERM /Saturday through Wednesday/...
Issued 1253 AM MDT WED OCT 28 2026
As the shortwave in the short-term period departs, the main low will 
begin moving its way through our area. This trough will have a good 
pull of Pacific moisture ahead of it, with precipitable water values 
increasing to around the 90th percentile in southwest Idaho. The 
better juxtaposition of forcing and moisture will fall over 
southwest Idaho, which will lead to increasing precipitation chances 
through the day Saturday, reaching 50-80% Saturday evening and night 
as a cold front crosses the area. That being said, an umbrella may 
be a fine addition to your Halloween costume. Snow levels will 
initially begin at 6-8 kft MSL, lowering to 4.5-6.5 kft MSL by 
Sunday afternoon. These lowering snow levels will coincide with 
decreasing precipitation chances as conditions dry out behind the 
front. Overall, the bulk of any snow accumulation will remain above 
6.5 kft MSL, with generally 2-5 inches of accumulation (Locally up 
to 7 on the highest peaks). The lowering snow levels could allow for 
snow or wintry mix as low as 4.5 kft Sunday, although little 
accumulation is anticipated as precipitation tapers off behind the 
departing system. Ridging will build in behind the departing system, 
allowing for dry conditions Monday afternoon through at least mid-
week. Temperatures will be seasonable or below normal throughout the 
period.

&&

.AVIATION /12Z Wednesday through Thursday/...
Issued 447 AM MDT WED OCT 28 2026

Generally VFR. Localized LIFR/IFR conditions this morning with 
patchy freezing fog and low clouds in high elevation valleys 
near KBNO-KMYL-KBKE. Mountains obscured in fog and low clouds.
Conditions improving after sunrise. Surface winds: Variable 
less than 10 kt this morning, then SW-SE 5-15 kt this 
afternoon. Winds aloft at 10kft MSL: SW 20-30 kt.

KBOI...VFR with clearing skies this morning. Surface winds: 
SE 5-10 kt with a period of light and variable winds this
afternoon. 

&&

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

OR...None.

&&

$$

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AVIATION.....NF
SHORT TERM...NF
LONG TERM....NF