753
FXUS65 KRIW 251114
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
514 AM MDT Sat Jul 25 2026

.KEY MESSAGES...

- Another round of showers and thunderstorms develops across
  western WY today, mainly on higher elevations of western
  mountains. A few thunderstorms could be strong, with locally
  gusty winds reaching 50 mph.

- Areas away from thunderstorms will be hot today, with highs in
  the 90s and low 100s. Heat Advisories are in effect for
  portions of central and northern WY today and Sunday.

- Very warm conditions will continue through the upcoming week,
  with highs each afternoon in the 90s. Monsoon moisture remains
  in place, bringing isolated mountain thunderstorms each
  afternoon.

&&

.DISCUSSION...
Issued at 307 AM MDT Sat Jul 25 2026

Not much pattern change expected during the next week, as the H5
ridge remains firmly anchored on the Four Corners. This will
keep very warm temperatures in place across most of the state,
with highs each afternoon in the 90s. Today will be the warmest
of these days, with some 100 degree readings for the Bighorn
Basin and along the I-25 corridor.

Even with the ridge holding hot temperatures in place, the
placement of the ridge will still allow monsoon moisture to draw
northeast into the western half of the state. This will bring
daily chances for showers and thunderstorms building along
the higher elevations of the western mountain ranges, then
drifting northeast around the ridge into Montana. Shower chances
will be enhanced by any small-scale shortwaves wrapping around
the ridge. One of these will sweep through this afternoon across
NW WY. Combine this enhancement with higher temperatures today
to bring some strong thunderstorms. With dewpoint depressions
approaching 50 degrees, very gusty winds would be the main
impact, with wind gusts in excess of 50 mph possible. As these
storms are moving northeast at a reasonable rate, localized
flooding concerns are decreased today. Daytime thunderstorm
chances will continue through the week, building during the
afternoon before decreasing at sunset.

&&

.AVIATION /12Z TAFS THROUGH 12Z SUNDAY/...
Issued at 509 AM MDT Sat Jul 25 2026

A few morning showers continue to drift through southwest WY
currently, but have only brought cigs down to around 10000 feet
and no significant wind gusts. Once daytime heating picks up,
some showers and thunderstorms will form again, mainly for NW
WY. Confidence remains good for PROB30s for most sites this
afternoon, so did some timing adjustments to those for the
afternoon. Only site with no precip mention is KCPR, but
isolated showers could also approach there late afternoon. Any
thunderstorms that do develop could produce gusty winds,
reaching at least 35kts, possibly as high as 50kts during peak
heating. Once heating decreases, showers will quickly dissipate,
with mostly clear skies for the overnight hours. Another day of
isolated thunderstorms expected again on Sunday.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
Heat Advisory from noon today to 9 PM MDT Sunday for
WYZ003>006-010-011-017-018-020.

&&

$$

DISCUSSION...Straub
AVIATION...Straub