Thatcher, Idaho Weather Forecast Discussion

281
FXUS65 KPIH 222331
AFDPIH
Area Forecast Discussion
National Weather Service Pocatello ID
531 PM MDT Mon Sep 22 2025
.KEY MESSAGES...
- Dry conditions through Sunday.
- High pressure returns with above normal temperatures Wednesday
  through the weekend.
- High pressure keeps precipitation away until next Monday.
&&
.SHORT TERM /THROUGH TUESDAY NIGHT/...
Issued at 1251 PM MDT Mon Sep 22 2025
Minimal impacts through Tuesday night. Do have a frost advisory
for the Snake River Plain zones overnight as lows will be in the
33 to 36 degree range in most areas but do not expect a
widespread freeze to occur. Showers will end before sunset in
the eastern mountains. No precipitation will occur later tonight
through Tuesday night as high pressure builds in with no wind
impacts. Lows tonight in the 20s mountains and 30s to around 40
in valleys. Highs Tuesday 50s and 60s mountains and upper 60s to
lower 70s valleys. Tuesday night will be warmer with lows in the
30s mountains and upper 30s to mid 40s valleys.
&&
.LONG TERM /WEDNESDAY THROUGH MONDAY/...
Issued at 1251 PM MDT Mon Sep 22 2025
Wednesday through Sunday will be very warm and dry with a return
to near summer like conditions. High temperatures will be in the
mid 60s to mid 70s mountains and upper 70s to lower 80s valleys.
The gridded data has a chance of showers returning on Monday. No
wind impacts expected under high pressure through the long term
period.
&&
.AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/...
Issued at 526 PM MDT Mon Sep 22 2025
A system is just exiting southeast Idaho with lingering light
showers, mainly along the Wyoming border. Clouds are starting
to clear with high pressure building in from the west. Winds
have dropped off as well and look to remain light through the
period. Only other concern might be potential stratus
development into PIH and IDA toward sunrise. Left a hedge cloud
deck in place but retained VFR for now.
&&
.FIRE WEATHER...
Issued at 1251 PM MDT Mon Sep 22 2025
Last gasp of showers moving through Zone 413 early this afternoon.
There is still a non-zero chance to see a stray shower or
thunderstorm this afternoon generally 410/411/413, otherwise dry
conditions are already shifting into the region. Ridge of high
pressure builds into the west for the week. While the ridge still
appears to weaken heading into the weekend, the flow generally stays
dry until potentially early next week. Daytime surface humidities
rapidly dry out through midweek, likely lowest late in the week with
a few areas across the Snake Plain trending back toward marginally
critical around 15%.
&&
.PIH WATCHES/WARNINGS/ADVISORIES...
Frost Advisory from 4 AM to 9 AM MDT Tuesday for IDZ052>054.
&&
$$
SHORT TERM...GK
LONG TERM...GK
AVIATION...TW
FIRE WEATHER...DMH

NWS PIH Office Area Forecast Discussion