919
FXUS65 KBOI 182048
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
248 PM MDT Fri Apr 18 2025

.SHORT TERM...Tonight through Sunday night...Currently sitting
underneath northerly flow aloft, bringing cooler than normal temps
and some ongoing gusty winds. Mostly clear skies will stick around
Friday until Saturday morning/midday when flow aloft gives way to a
small shortwave trough. Cloudy skies will be present much of
Saturday associated with this shortwave. Precipitation chances
Saturday are small, limited to Northern Adams and Valley counties
with PoPs anywhere from 15-30%. Snow levels will be around 5500-6000
feet. A long wave trough will impinge on the area Sunday. This upper-
air disturbance will also have precipitation chances limited to
Northern Adams and Valley counties, with PoPs ranging from 20-50%.
Thunderstorms are possible Sunday afternoon and evening in Northern
Adams and Valley counties as well as near the ID/NV border in higher
terrain. Thunderstorm chances along the ID/NV border range from 20-
50% as well. Afternoons during this period will have gusts up to 20
mph, with decreasing wind speeds into the overnight hours.
Temperatures are seasonable over this period.


.LONG TERM...Monday through Friday...Broad troughing across the
CONUS keeping the area under northwesterly flow aloft early next
week. Monday will be the coolest day of the week with breezy NW
winds, chances of seeing winds >20 MPH range from 40-65% as you
follow the Snake Plain east from Mountain Home. Precipitation
chances remain (20-40%) in the West-Central Mountains as the
shortwave exits our area. Another weak wave will pass over the
region Wednesday, but it looks to be too dry for precipitation
barring a 10-20% chance in the higher elevations of the West-
Central Mountains. Following that shortwave, model ensembles are
indicating a short lived ridge building over the area Thursday ahead
of the next system. Chances for precipitation increase Friday
afternoon as an upper level trough begins to enter our area.
Temperatures trend up throughout the week, Leaning above normal.
Snow levels rising from 5-6kft MSL on Monday to 7-8kft by Friday.

&&

.AVIATION...VFR this afternoon/tomorrow morning. Clouds
increasing Saturday afternoon with a 15-20% chance of seeing showers
in the West-Central ID Mtns near KMYL. Snow levels at 6-7kft.
Surface winds: W-NW 5-15 kt tonight/tomorrow, variable under 10 kt
overnight. Winds aloft at 10kft: N-NE 5-15 becoming N-NW 10-20kt.

KBOI...VFR. Surface winds under 10 kt. Following typical diurnal
cycle, NW becoming SE tonight, switching back to NW tomorrow.

Weekend Outlook...VFR with surface winds W-NW at 5-15 kt during
days, light and variable over nights. Increasing clouds and
precipitation chances both Saturday and Sunday afternoons. With a 10-
20% chance of precip near KMYL saturday afternoon. Low (10-20%)
chance of thunder Sunday afternoon in the ID W-Central Mtns and
Southern Highlands. Mountains obscured in precipitation. Snow levels
5.5-7 kft MSL

&&

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

&&

$$

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