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Forecast Discussion for Boise, ID

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685
FXUS65 KBOI 160906
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
306 AM MDT Mon Mar 16 2026

.KEY MESSAGES...

- Warm front will bring a dusting of snow to northern mountains
  this morning before changing to light rain and ending this
  afternoon.

- Strong warming later today through Wednesday, with widespread
  record high temperatures and dry conditions continuing through
  Saturday, then cooling.

&&

.SHORT TERM /Through Wednesday Night/...
Warm front and light snow will be in northern areas this morning.
Total snowfall  one inch or less before changing to rain mid-
morning and ending this afternoon. Southern areas. i.e., south
of the warm front, will warm rapidly today with highs about 15
degrees warmer than yesterday in Idaho and around 20 degrees
warmer in southeast Oregon. Light winds this morning will become
westerly before noon, with afternoon gusts to 30 mph in the
Snake Basin east of Boise. Similar winds are expected Tuesday
afternoon. The warming trend will continue into Tuesday and
Wednesday as a very strong upper ridge builds inland across the
western US. High temps Tuesday should be 8 to 12 degrees warmer
than today and near record highs for the date. Wednesday will
be another 5 to 8 degrees warmer and will be among the warmest
days ever recorded so early in the year.

&&

.LONG TERM /Thursday through Monday/...
An anomalously strong high pressure system is expected to
dominate the weather into next weekend. Both ensemble and
operational model guidance remains in very strong agreement
regarding the ridge, leading to high forecast confidence in
much warmer and continued dry conditions. Temperatures are
expected to remain 15-25 degrees above normal area-wide
Wednesday into Saturday. Lower valley high temperatures will
approach daily records, with temperatures in the upper 70s
and lower 80s.

Sunday and Monday the upper level flow becomes more zonal as
an Alaskan low pushes the dominant ridge southward, dropping
heights and moving a colder airmass into the area. While the
forecast temperature spread is large on Sunday and Monday, the
overall consensus shows high confidence in the cooling trend
setting in next week.

&&

.AVIATION /06Z Monday through Tuesday/...
Issued 1131 PM MDT SUN MAR 15 2026

Isolated light showers across the north, including BKE and MYL,
continue overnight with snow levels 4-6 kft MSL and brief MVFR
conditions. Showers mostly clear late in the morning, with
predominant light rain showers making a brief return in the
afternoon. Surface winds less than 10 kt tonight. Winds aloft
at 10kft MSL: NW 30-40 kt.

KBOI...VFR and overcast. Surface winds generally out of the SE
less than 7 kt overnight.

&&

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

OR...None.

&&

$$

www.weather.gov/Boise

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SHORT TERM...LC
LONG TERM....JM
AVIATION.....JM

Previous Forecast Discussions may be found at
NWS Boise, ID (BOI) Office Forecast Discussions.
(Click 'Previous Version' there to view past versions successively.
Some may differ only in time posted.)

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