672
FXUS65 KBOI 262047
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
247 PM MDT Sat Apr 26 2025

.SHORT TERM...Tonight through Monday night...At 2 PM MDT
showers were developing over higher terrain in our CWA,
mainly in western Owyhee County and in the Boise Mountains.
Meanwhile, the main Pacific upper low has moved toward the
California coast just off SFO. The low is forecast inland
across central California this evening, northeastward across
Nevada overnight, southeast ID Sunday, then western Wyoming
Sunday night. This track will bring significant rain to our
southern zones overnight through Sunday night, heaviest
(up to 1.00 inch) in southern Malheur County, and generally
.50 to 1.00 inch along the entire northern Nevada border.
Another area of moderate to heavy pcpn (.50 to .80 inch) is
indicated in the central Idaho mountains east of Idaho City-
McCall. Elsewhere, expect .15 to .30 inch total rainfall in the
Treasure Valley, upper Weiser River Valley, and central Malheur
and Harney Counties in Oregon. Around .10 inch is forecast for
the western Magic Valley. Least rainfall (less than .10 inch) is
slated for Baker County. As the upper gets into northeast
Nevada Sunday a north-south cold front will take shape in our
Idaho zones, with showers and a 20-40 percent chance of
thunderstorms along the front as it moves east, finally exiting
our CWA Sunday night. West to post-frontal northwest winds will
increase to 15 to 25 mph in Oregon and western Idaho Sunday
afternoon. Temperatures will be mild tonight due to southerly
flow aloft, and again Sunday night due to continuing mixing
winds. High temps Sunday will be a few degrees lower than today
with widespread clouds and showers in our CWA.

.LONG TERM...Tuesday through Saturday...As an upper low moves
east Tuesday morning, another trough will move in that night
into Wednesday morning, bringing another round of clouds and
precipitation. This will cool Tuesday to right about normal
temperatures. Wednesday afternoon through Friday morning upper
high pressure dominates, warming temperatures up to 10-15
degrees above normal. Highs in the Snake Plain Thursday and
Friday will be close to just above 80 degrees. Some uncertainty
exists about the timing of our next system later Friday. While
the GFS deterministic brings the precipitation in the afternoon,
potentially limiting the max temperature to the upper 70s;
other deterministic models show a Friday evening arrival which
would allow temperatures to warm up to the mid-low 80s in the
Snake Plain. Confidence is high in the systems track through our
area and thusly the temperature forecast for Saturday dropping
back to near normal. Thunderstorms are possible later Friday and
Saturday.

&&

.AVIATION...Mostly VFR. Showers and isolated thunderstorms
across high terrain and SE OR this afternoon/evening, with a
10% chance for Snake Plain locations to see precipitation.
Outflows up to 30 kt possible near storms. Showers continue in
SE OR overnight before redeveloping areawide early Sunday
afternoon. Surface winds: Becoming N-NW 10-15 kt. Winds aloft
at 10kft: variable 5-15 kt.

KBOI...VFR. Shower and thunderstorm activity this afternoon
is most likely to stay to the NE and SW over higher terrain,
though a stray 20 kt gust front is possible from distant
showers. Surface winds becoming N-NW 7-12 kt aft 20Z.

Sunday Outlook...Mainly VFR. Areas of MVFR in scattered to
numerous showers and isolated thunderstorms resulting in
mountain obscuration and gusty outflows. Showers and storms
will orient along a KREO-KMYL line. Winds mostly NW-N 10-25
kt, SE OR will gust up to 35 kt in the afternoon and evening.

&&

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

&&

$$

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