291
FXUS65 KBOI 180801
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
201 AM MDT Sun May 18 2025

.SHORT TERM...Today through Tuesday night...A cold front is
presently working its way southeast through the area, and NW
winds behind this features have increased early this morning.
Gusts over 35 mph have been reported already, and stronger winds
will occur after sunrise. Therefore the wind advisory will be
kept in place and extended until 9 PM MDT this evening.
Otherwise, the forecast shows little change. A closed upper low
will move SE through Idaho today and tonight, providing an
atmosphere conducive to showers mainly across our northern and
eastern areas. There`s also a slight chance of thunderstorms,
but we don`t expect more than a few lightning strikes. The
closed low will move rapidly away from the area Monday, leaving
us in NW and then zonal flow aloft going into Tuesday. A weak
short wave embedded in this mainly zonal flow warrants low PoPs
across portions of the Idaho mountains, including the higher
terrain in/near southern Twin Falls County, Monday night and
Tuesday. Tue night should be dry. Temps will be quite cool today
in the wake of the cold front, with readings around 15 degrees
below normal. A nice warming trend will begin Monday, with
readings only 5-10 degrees below normal. And Tue should see
highs only 5 degrees below normal. This warming trend will
continue into the long term period.

.LONG TERM...Wednesday through Sunday...The region remains on track
for a series of atmospheric disturbances working through a generally
zonal upper-level flow pattern. The strongest of the disturbances is
currently slated for late Friday into early Saturday. There is fair
agreement that the system will be on the weaker side, with
precipitation focused over northern Idaho and into Montana. Have
continued the 15-20% chance of precipitation for the central Idaho
mountains during that time frame. Temperatures are expected to be 5-
10 degrees above normal.

&&

.AVIATION...Mostly VFR with an area of MVFR/IFR accompanying
showers from KBOI to the southeast across central and south central
Idaho due to low ceilings. Mountains obscured. Conditions will
improve to VFR area-wide after 12Z. Snow levels falling to 5000-7000
ft MSL. A strong NW to SE pressure gradient will elevate winds
throughout the day. Surface winds: increasing to NW 15-25 kt with
gusts up to 40 kt by 18Z. Winds aloft at 10kft MSL: NW 20-40 kt.

KBOI...Generally VFR. Showers lingering through 10/11Z with MVFR/IFR
possible (30% chance) and mountains obscured. Surface winds: NW
10-15 kt, increasing to 15-25 kt with gusts to 30 kt after 18Z.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Wind Advisory from 6 AM this morning to 7 PM MDT this evening
     IDZ014-016-028-030.
OR...None.

&&

$$

www.weather.gov/Boise

Interact with us via social media:
www.facebook.com/NWSBoise
www.x.com/NWSBoise

SHORT TERM...SP
LONG TERM....MC
AVIATION.....MC