711
FXUS65 KBOI 061533
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
933 AM MDT Sun Apr 6 2025

.DISCUSSION...High clouds will continue to spread across the
region this morning as a Pacific cold front moves into southeast
Oregon late tonight. Rain showers will bring precipitation to
all areas by Monday morning, with snow showers above about
6000-7000 feet. There is a slight chance of thunderstorms (20%),
mainly over northern portions of the CWA by Monday afternoon. A
few hi-res models are highlighting a line moving through Baker
County-West Central Mountains early tomorrow afternoon. No
updates necessary.

&&

.AVIATION...VFR with high clouds today. Lower VFR ceilings and
rain showers will increase tonight across SE Oregon and SW Idaho
Monday morning. Surface winds: less than 10 kt, becoming SE-SW
up to 15 kt this afternoon. Winds aloft at 10kft: N-NW 5-15 kt
shifting to SW 10-20 kt by Mon/00Z and increasing to 25-45 kt
after Mon/06Z.

KBOI...VFR with light winds today. Winds becoming SE 8-15 kt
late this evening.

&&

.PREV DISCUSSION...
SHORT TERM...Today through Tuesday night...Warming will peak today
as the axis of an upper level ridge passes through our CWA from
west to east. Today will be generally sunny with light southeast
winds. Clouds will increase late today in Oregon ahead of an
approaching Pacific surface cold front and upper trough. The
clouds will spread eastward into Idaho tonight, and rain
showers will begin in Oregon as the cold front moves inland.
Showers will be most numerous in our northern areas overnight
and Monday, tapering to only sprinkles along the Nevada border.
The northern areas will get .15 to .25 inch rainfall through
Monday afternoon, and another .20 to .30 inch Monday night
through Tuesday as moist westerly aloft continues off the
Pacific. These amounts are marginally greater than forecast
yesterday. Latest models (and SPC) also see enough instability
for a slight chance of thunderstorms Monday afternoon and evening
in Baker County and the west-central Idaho Mountains. High temps
today will range in the 50s to mid 60s in the mountains, and
mid 60s to lower 70s in the valleys. Lows tonight will be mild
under cloud cover, generally 30s in the mountains and lower to
mid 40s in the valleys. Monday`s highs behind the cold front
will lower as much as 10 degrees from today`s highs, with the
greatest cooling in Oregon and least in south-central Idaho,
which will see their main cooling on Tuesday instead. Light
to moderate southeast winds tonight ahead of the cold front
will shift to northwest behind the front on Monday, with
afternoon gusts reaching 30 mph in eastern Oregon and the
southwest Idaho Highlands. Lighter northwest winds are
expected elsewhere on Monday.

LONG TERM...Wednesday through Sunday...An upper level ridge
will amplify along the coast on Wednesday. This will push the
storm track to our north with any lingering showers across
northern areas ending by the afternoon. Temperatures will warm
a few degrees from Tuesday as the ridge builds. The ridge axis
will move overhead and then to our east on Thursday. The ridge
combined with increasing southwest flow aloft will result in
temperatures around 10 degrees warmer than Wednesday, or around
15 degrees above normal. On Friday, an upper level trough will
move into the Pacific Northwest, but the bulk of the cooler air
accompanying the trough is expected to remain to our west until
the weekend, resulting in temperatures only a couple degrees
lower than Thursday. Uncertainty increases over the weekend as
ensembles disagree on the timing and strength of the trough as
it moves inland. Overall, a cooling trend is anticipated with
temperatures forecast to cool to a few degrees below normal by
Sunday. Chances of showers will increase on Friday across the
northern mountains with around a 10-40% chance of showers across
the area over the weekend. Periods of breezy winds are expected
Thursday through the weekend.

&&

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

&&

$$

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DISCUSSION...SA
AVIATION.....SA
SHORT TERM...LC
LONG TERM....ST