Meridian, Idaho Weather Forecast Discussion

287
FXUS65 KBOI 212058
AFDBOI
Area Forecast Discussion
National Weather Service Boise ID
258 PM MDT Sun Sep 21 2025
.SHORT TERM...Tonight through Tuesday night...A cold front
continues to move through the region today with scattered
showers and isolated thunderstorms over the Idaho side. The
cold front will bring breezy conditions this afternoon with wind
gusts of 20-30 mph from the west-northwest. The thunderstorm
threat appears to be from Rome OR to Boise and areas east right
now with the threat ending west of this line. Temperatures cool
to around 5 degrees below normal on Monday. Breezy conditions
continue on the Idaho side on Monday with gusts of 20-30 mph
during the afternoon in the Treasure Valley and Magic Valley. A
ridge rebuilds over the area on Monday with warm and dry
conditions. Temperatures Tuesday warm to around 5 degrees above
normal with dry conditions.
.LONG TERM...Wednesday through Sunday...An upper-level ridge
will be well in place Wednesday into Thursday as an omega
block pattern sits over the mainland United States. Temperatures
will be 5 to 10 degrees above normal. Midday Thursday into
evening, an upper-level low will move east into the Desert
Southwest, creating more zonal flow conditions over the area.
Over the weekend, an upper-level trough system off the coast of
Alaska will begin to dictate flow over the Pacific Northwest.
Multple rounds of shortwaves troughs embedded in the flow will
attempt to move through the area, however limited moisture will
inhibit any attempts at convection. Once this low gets close to
moving inland, deterministic guidance vary considerably.
Ensembles continue to struggle with the evolution of this
trough, which would drastically determine how cool and wet
conditions will become once it moves onshore.
&&
.AVIATION...Generally VFR. Isolated to scattered showers and
thunderstorms ongoing this afternoon ahead/along a cold front moving
W to E. Stronger cells will be capable of brief rain, small hail,
and gusty outflows to 30-40 kt. Mtns obscured in precip.
Overnight and early Monday morning, patchy fog likely in
mountain valleys and areas with slow wind speeds overnight.
Surface winds: SW-NW 5-15 kt with 15-30 kt gusts. Winds aloft
at 10kft MSL: SW to W 10-25 kt.
KBOI...VFR. Surface winds: NW 5-10 kts overnight with gusts to
20 kts possible this afternoon.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.
&&
$$
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SHORT TERM...KA
LONG TERM....CH
AVIATION.....CH

NWS BOI Office Area Forecast Discussion