Mills, Wyoming 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

371
FXUS65 KRIW 260910
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
310 AM MDT Sun Jul 26 2026

.KEY MESSAGES...

- Yet another day of isolated to widely scattered showers and
  thunderstorms across northwest Wyoming. A few thunderstorms
  could be strong, with locally gusty winds reaching 50 mph.

- Another day of hot temperatures across the state, with highs
  reaching the mid 90s to low 100s. Heat Advisories remain in
  effect for portions of central and northern WY.

- This pattern remains steady through the upcoming week, with
  above normal temperatures and monsoon showers and
  thunderstorms each afternoon.

&&

.DISCUSSION...
Issued at 249 AM MDT Sun Jul 26 2026

The overall pattern across the western US remains relatively
unchanged today, with the H5 ridge centered over the Four
Corners, and WY along the northern periphery of the ridge. Above
normal temperatures remain in place across the state under the
ridge, with record to near-record highs again expected today.
The Heat Advisory remains in place for the lower elevations of
central and northern WY for the continued heat and the very warm
overnight temperatures. Monsoon moisture continues to wrap
around the northern edge of the ridge into NW WY, which will
bring another round of showers and thunderstorms. Storms again
will initially form on the higher elevations of western
mountains and move to the northeast. Storms will have good
forward motion again, so this will minimize the overall flooding
threat. Strong Inverted-V profile indicates main thunderstorm
threat will be gusty winds, possibly gusting above 50 mph,
especially across northern WY where the T-Td spread will be
greatest.

Longer term models show nearly no change in this pattern the
entire week, with the H5 ridge holding fast across the southern
Rockies. This will keep the heat in place, with the daytime
thunderstorms each afternoon for NW WY. An embedded shortwave
races around the northern edge of the ridge on Wednesday, which
could bring an enhancement of the thunderstorms for more of the
state.

&&

.AVIATION /06Z TAFS THROUGH 06Z MONDAY/...
Issued at 1000 PM MDT Sat Jul 25 2026

Enough mid-level moisture remains overnight to allow for
continued isolated showers over the northwest-quadrant of the
state into early Sunday morning. Convection will develop over
the western mountains after 18Z, quickly becoming widespread by
20Z/21Z and pushing east into the central basins. PROB30 groups
have been added to KBPI/KPNA and KRIW/KLND and KWRL as a
result, with KJAC and KCOD still under threat from these
afternoon showers and thunderstorms. Gusty outflow wind 35-45kt
will again be the primary hazard. Confidence remains too low to
include a PROB30 group at KRKS at this time, but could be added
in a future forecast.

Showers and thunderstorms will be ending/moving east out of the
forecast area after 00Z Monday through sunset. Model trends are
depicting scattered showers moving northward over southern
portions after 03Z Monday.

Please see the Aviation Weather Center and/or CWSU ZDV and ZLC
for the latest information on smoke, icing and turbulence
forecasts.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
Heat Advisory until 9 PM MDT this evening for WYZ003>006-010-
011-017-018-020.

&&

$$

DISCUSSION...Straub
AVIATION...CNJ/LaVoie