238
FXUS65 KPIH 301859
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
1259 PM MDT Wed Sep 30 2026

.KEY MESSAGES...

- Prolonged Quiet Weather Period: High pressure and dry air
  will keep eastern Idaho completely dry with minimal cloud
  cover through the workweek, upcoming weekend, and into early
  October. Zonal flow aloft will hold daytime highs near late-
  September averages in the upper 60s to lower 70s across lower
  elevations through Wednesday.

- Unseasonable Late-Week Warmth: An amplifying Great Basin
  ridge will boost lower-elevation temperatures into the upper
  70s and lower 80s starting Thursday and continuing through the
  weekend.

- No Fall-Like Weather in Sight: High confidence exists for
  above-normal temperatures and suppressed precipitation
  extending through the first full week of October.

&&

.DISCUSSION...
Issued at 1259 PM MDT Wed Sep 30 2026

High pressure in control over East Idaho through the weekend,
keeping conditions warm and dry. Daytime highs across most lower
elevations look to remain in the upper 70s to lower 80s.
Overnight lows remain in the upper 30s to lower 40s. Operational
models continue to depict a weak low shifting through the Great
Basin Monday into Tuesday, which MAY have some potential to
produce isolated showers or thunderstorms. Ensembles wash out
this feature, and even the 90th percentile QPF Monday into
Tuesday remains very light, so confidence is extremely low at
this time for any meaningful break in the pattern.

&&

.AVIATION /18Z TAFS THROUGH 18Z THURSDAY/...
Issued at 1136 AM MDT Wed Sep 30 2026

VFR expected through the period with mainly clear skies. Could
see some afternoon wind gusts at times pushing 15 kts in the
valley terminals but winds will again become light and variable
overnight and into Thursday AM.

&&

.FIRE WEATHER...
Issued at 1259 PM MDT Wed Sep 30 2026

Dry weather is likely through the weekend and into much of next week
as high pressure will remain in control across eastern Idaho. A few
gusts to 15 to 20 mph are possible the next few afternoons, mainly
across lower elevations. Winds become even light over the weekend as
high pressure amplifies over the area keeping things dry and
temperatures on the warmer side of normal into next week.

&&

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

&&

$$

DISCUSSION...DMH
AVIATION...McKaughan
FIRE WEATHER...McKaughan