Green River, Wyoming 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

312
FXUS65 KRIW 012300
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
400 PM MST Sun Feb 1 2026

.KEY MESSAGES...

- Warmer than average temperatures continue through the next
  week with mainly dry conditions.

- Minimal snow chances (10-20%) for the northern Bighorns and
  points east Monday evening with a weak system with the main
  impact of increased clouds and temperatures not quite as warm
  Tuesday.

&&

.UPDATE...
Issued at 108 PM MST Sun Feb 1 2026

The topsy-turvy winter continues across Wyoming, with
temperatures running about 10 degrees warmer here than in
central Florida this afternoon. Weather remains steady through
the next 24 hours, staying well above normal temperatures and
lighter winds. The next weather system still expected Monday
night, with an inch or two of snow for the northern Absarokas
and Bighorns, otherwise passing by with just mid to high clouds.

&&

.DISCUSSION...
Issued at 1200 AM MST Sun Feb 1 2026

More of the same for the forecast with warmer than average
temperatures up to 20 degrees east of the Divide and mainly dry
conditions for at least another week. IR continues to depict
cirrus spilling over the strong upper level ridge over much of
the western United States, and will only increase in coverage
later on Sunday and into Monday. With the northwest flow aloft,
expect a stronger drainage wind for the Wind River Basin even
in the overnight hours seeing gusts over 20 mph through much of
the day Sunday and even into Monday as well, picked up mostly by
the ever reliable FV3. Otherwise, breezy winds at the usual
suspect areas for the wind corridor of Sweetwater to Natrona
Counties, even extending into parts of Johnson as well for
Sunday.

The main finger of the PFJ remains well north into Canada before
dipping into far northeastern parts of the country keeping the
colder air north of the border. The aforementioned ridge does
break down a bit as convergence weakens aloft that will allow
for a weak shortwave to push by to the northeast Monday
afternoon and evening. This will drop a "cold" front through the
area that will knock temperatures a few degrees for Tuesday but
still above average for this time of year to start the month of
February. Minimal snow shower chances across the Bighorns Monday
night into Tuesday morning dropping to Johnson County possibly
but low confidence on anything significant (10-20%) at this
time. Once this pushes through, the upper level ridge builds in
stronger with increasing convergence aloft. This will keep the
warmer than average temperatures, dry conditions, and breezy
winds in the wind corridor through the week and weekend.

Longer term model solutions, in particular the EC, depict a
stronger system to affect the area come early the following
week. The PFJ dips south allow for a strong westerly flow aloft
that will likely bring western mountain snow as it normally does
with the northwest Pacific moisture pushing in. With this,
points east of the Divide will likely remain mostly dry but
colder temperatures should be had for all if this comes to
fruition. This is the only hope for a winter sighting in the
long term forecast.

&&

.AVIATION /00Z TAFS THROUGH 00Z TUESDAY/...
Issued at 359 PM MST Sun Feb 1 2026

VFR conditions through the period with high pressure in place. High
clouds persist into this evening, but are on a decreasing trend into
Monday morning, with a mainly clear to clear sky by late Monday
morning. Otherwise, winds follow typical diurnal trends, decreasing
this evening and increasing for Monday afternoon.

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

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

UPDATE...Straub
DISCUSSION...Lowe
AVIATION...Wittmann