046
FXUS65 KPIH 061018
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
418 AM MDT Sun Apr 6 2025

.KEY MESSAGES...

- High pressure will bring a sunny and warm day today.

- Rain showers and high mountain snow showers return Monday and
  Tuesday, with increasingly breezy to windy conditions Monday,
  Tuesday, and Wednesday as well.

- Dry and warm ridge returns Wednesday into next weekend, with 70s
  returning to the forecast for some areas starting Thursday.

&&

.SHORT TERM /THROUGH MONDAY NIGHT/...
Issued at 318 AM MDT Sun Apr 6 2025

Upper level ridge moving over Idaho today will bring another
sunny day today with temperatures continuing to warm. Highs
today mainly in the 50s mountains and upper 50s to mid 60s
valleys. Upper ridge moves east Monday and will see some
precipitation move in from the west Monday afternoon through
Monday night. Snow levels will be anywhere from 7000 to 8500
feet. Lows tonight 20s and 30s with highs Monday again mainly
50s mountains with some 40s at higher elevations and 60s in
valleys. Lows Monday night mainly 20s and 30s mountains and
upper 30s to middle 40s valleys. Expect an increase in winds
Monday afternoon with 10 to 20 mph sustained in the Snake River
Plain and higher peaks in that range as well. Mountains will see
a greater than 50 percent chance of over 0.10 liquid Monday and
Monday night. Very low chance of over 0.10 in Snake River Plain.
Not expecting any snow impacts due to very high elevations it
will occur.

&&

.LONG TERM /TUESDAY THROUGH SATURDAY/...
Issued at 318 AM MDT Sun Apr 6 2025

An upper level trough moving through southern Canada
will provide a low risk of precipitation, including some high level
snow, but mostly rain, to the forecast area during the first 24
hours of this period. A second, drier and weaker impulse moves
through Wed. This second feature brings nothing to Idaho except in
Lemhi County. By Wed evening, upper level high pressure will move in
and amplify over the next couple of days, bringing clear skies. This
high pressure appears to last through at least Sat afternoon, with
about 20 percent of the clusters breaking the ridge down already by
that time. About half of the clusters indicate an upper level trough
returning on Sun, bringing clouds and precipitation.

The clouds and colder air on Tue will bring colder afternoon highs,
then partial clearing will allow temperatures to plunge 6 to 12 deg
F compared to Mon night. Complete clearing by Wed afternoon will
allow warming despite the colder start Tue night. Then the clear
skies Wed night will bring temperatures in the heavily populated
areas once again below freezing. For Thu and Fri, the clear skies
will mean some temperatures exceeding 70 deg F. Increasing high
clouds could bring temperatures down for Sat, and a full blown upper
level low continues the cooling trend for highs on Sun.

The main focus in the first two days will be wind. Since eastern
Idaho will be in the base of the 500mb trough, there is strong upper
level support for very windy conditions, both for Tue and Wed
afternoons/evenings. So a Wind Advisory may be needed for both of
those days, with consideration for localized blowing dust north of
Idaho Falls.

&&

.AVIATION /12Z TAFS THROUGH 12Z MONDAY/...
Issued at 416 AM MDT Sun Apr 6 2025

Strong high pressure keeps CIG and VSBY unlimited until the next
trough makes its approach on Mon afternoon, beyond all current
TAFs. Wind shifts have been forecast, with some long periods of
variable below 4KT. No impacts to airfield or aircraft
operations expected.

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

SHORT TERM...GK
LONG TERM...Messick
AVIATION...Messick