734
FXUS65 KPIH 201048
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
Issued by National Weather Service Boise ID
448 AM MDT Tue May 20 2025

.KEY MESSAGES...

- Precipitation returns today for most of the area.

- Temperatures will be cooler than normal with a gradual warming
  trend starting. Will likely still need frost advisories for
  Wednesday AM.

- Threat of precipitation for Thursday through Saturday, mainly
  northern half of east Idaho.

&&

.SHORT TERM /THROUGH WEDNESDAY NIGHT/...
Issued at 125 AM MDT Tue May 20 2025

Expect cooler temperatures today behind yesterday`s exiting
system. Today another trough/system moves through the area.
Expect isolated to scattered showers across the area with
isolated thunderstorms mainly for our eastern areas along the
Wyoming border. Winds will be breezy today, especially in the
afternoon, with gusts of 20 to 40 mph likely. A lake wind
advisory for the American Falls reservoir has been issued.

Wednesday temperatures will be cool again, especially in the
morning, with clearing behind an exiting trough. A frost
advisory for morning temperatures from 33 to 36 will likely be
needed across the Shoshone area, Arco desert, Snake River plain
and the Eastern Magic valley. Wednesday will be mostly clear
and dry. Expect a warming trend starting in the afternoon.

&&

.LONG TERM /THURSDAY THROUGH TUESDAY/...
Issued at 125 AM MDT Tue May 20 2025

A short wave will move through Idaho Thursday with a chance of
showers and thunderstorms mainly in mountainous areas but even low
elevations with a slight chance.  Will be breezy with sustained west
to southwest winds 10 to 20 mph sustained expected.  High
temperatures will be in the 60s mountains and 70s valleys. Friday
will be drier but still a slight chance of showers and thunderstorms
again mainly mountainous areas.  Highs still 60s mountains and 70s
valleys.  Will see lingering showers and thunderstorms Saturday as
upper level ridge builds to the west.  Expect a warming trend Sunday
into next Tuesday as ridge slides overhead.  Highs will reach the
lower 80s valleys Monday and Tuesday and 70s mountains as we finally
get to above seasonal normals after a long cool period.

&&

.AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/...
Issued at 434 AM MDT Tue May 20 2025

Main impacts today will be an increase in winds at all sites
this afternoon with 15 to 25 knots sustained at BYI, PIH and IDA
with gusts 25 to 35 knots. DIJ and SUN will also increase after
18Z to 10 to 20 knots sustained and gusts 20 to 30 knots. Did
put predominant showers in at DIJ after 18Z with vicinity
thunderstorms. For the most part just VCSH elsewhere. Should
have clearing skies overnight with winds diminishing but still
holding around 10 knots. Will have widespread dry conditions
tonight through Wednesday night with skies clearing overnight
tonight.

&&

.FIRE WEATHER...
Issued at 125 AM MDT Tue May 20 2025

Temperatures today will still be cooler than normal because of
yesterday`s low pressure system. The next trough brings isolated
to scattered showers today. Isolated thunderstorms are possible
mainly for our eastern areas along the Wyoming border. Winds
will be breezy today with a trough moving through. Expect
afternoon gusts of 20 to 40 mph. Expect another quick system on
Thursday and another weak system late Friday into early
Saturday. Temperatures will gradually become above normal by
late week and continue warmer than normal through the weekend
into early next week. High pressure will bring overall dry
conditions late Saturday through most of next Monday.

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
Lake Wind Advisory from noon today to 8 PM MDT this evening
for IDZ054.

&&

$$

SHORT TERM...TW
LONG TERM...GK
AVIATION...GK
FIRE WEATHER...TW