102
FXUS65 KBOI 051011
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
411 AM MDT Sun May 5 2024

.SHORT TERM...Today through Tuesday night...Precipitation will
wrap around a closed low as it tracks through northern NV today.
This will put the focus of heavier precipitation across the
w-central mtns early this morning and over SE Oregon through the
day and into this evening. Cold air on the backside of the low
is quickly dropping snow levels across SE Oregon and the Owyhee
mtns this morning, setting up potential for accumulating snow
down to 4kft MSL. Expect 3 to 8 inches above 5000 feet and over
a foot possible across Steens Mtn. In SW Idaho snow levels will
remain between 4500 feet along the ID/NV border to 5500 feet
over the w-central mtns through this evening. The precipitation
on the backside of the low will shift eastward tonight as the
low crosses the Rockies. This will bring a break to the
rain/snow across SE Oregon while increasing precipitation
coverage and lowering snow levels across SW Idaho zones. By
Monday morning snow levels of 3500-4500 feet could bring a mix
of rain/snow or brief changeover to snow in the Snake Plain east
of Boise. Low temperatures will remain above freezing so
valley sites below 4500 feet will stay wet. Mountains will pick
up additional snowfall overnight and see a further boost as a
trailing upper wave brings another round of valley rain and mtn
snow Monday into Tuesday. Westerly flow aloft will bring breezy
winds each afternoon through Tuesday. The western Magic Valley
will see the strongest winds and could be inline for a Wind
Advisory on Tuesday. Temperatures are 10-15 degrees below normal
through Tuesday.

.LONG TERM...Wednesday through Sunday...An upper level trough
will remain over the western US through Thursday, keeping
temperatures cooler than normal. Temperatures will be around 10
degrees below normal on Wednesday before warming to near normal
by Thursday. An upper level ridge is forecast to build over the
Pacific NW and southwest Canada on Friday into the weekend.
Record breaking temperatures possible over portions of the
Pacific NW, but the center of the ridge will be north and west
of our area, where the warmer temperatures are. Temperatures
raise to around 5-10 degrees above normal for Saturday and
Sunday. A weak trough lingers over the Great Basin Saturday and
Sunday, with a threat of afternoon thunderstorms and slightly
cooler temperatures. Forecast confidence is low on the strength
of the trough and the placement.

&&

.AVIATION...Generally MVFR to IFR with mountain obscuration in
rain and snow. Snow levels 3500-4500ft, lowest over central OR,
except 5500-6500ft MSL over central ID mountains. Surface
winds: NW-SW 10- 20kt. Winds aloft at 10kft MSL: variable
10-20kt becoming W-NW 20- 30kt by 00z/Mon.

KBOI...VFR thru 16z/Sun then MVFR to IFR conditions at times in
rain showers. Surface winds: SE 5-10kt thru 16z/Sun becoming
W-NW 5-15kt.

&&


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

&&

$$

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SHORT TERM...DG
LONG TERM....KA
AVIATION.....KA