Rock Springs, Wyoming 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

290
FXUS65 KRIW 131728
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
1028 AM MST Tue Jan 13 2026

.KEY MESSAGES...

- Above average temperatures through Thursday about 10 to 20
  degree for this time of year.

- A weak frontal boundary pushes through east of the Bighorns
  Tuesday afternoon brining gusty winds for Johnson and Natrona
  Counties, along with some light snow showers for the northern
  Bighorns to even Casper Mountain.

- A stronger cold front pushes through Thursday that will bring
  temperatures to more seasonable for Friday, but another
  warming and dry trend for the weekend and into next week.

&&

.DISCUSSION...
Issued at 1200 AM MST Tue Jan 13 2026

Upper level ridging continue to dominate much of Western CONUS
centered around a high over northern California. As such, the
main finger of the PFJ remains to the north before it dives
south into the Great Plains and Missouri River Valley. IR
depicts ample high clouds spilling over the aforementioned ridge
across the state with no weather concerns for the foreseeable
future impact wise.

A weak mid level disturbance propagates south down the ridge
that will drop a weak frontal boundary east of the Bighorns for
Tuesday afternoon. Winds will be gusty up to 40 to 45 mph plus
for Johnson and Natrona Counties through about sunset.
Otherwise, some light snow showers expected for the northern
Bighorns earlier in the afternoon to even Casper Mountain by
evening time. Little to no accumulations expected due to the
warmer temperatures ongoing with no impacts expected.
Temperatures will remain 10 to 20 degrees warmer than average,
especially east of the Divide through Thursday ahead of the
next system.

This disturbance looks to be a bit more potent than Tuesday but
still limited in impacts. Outside of some gusty winds and cooler
temperatures, minor snow showers expected for the same general
areas of the Bighorns to Casper Mountain. Temperatures the only
impact to be felt with more seasonable temperatures for mid
January Friday at worst. Ensemble data keeps this consistent
behind the FROPA late Thursday into early Friday morning.
Otherwise, ridging builds back in even stronger for the weekend
and into much of next week. Warming and dry trend continues with
longer term outlooks seeing more of the same for the remainder
of the month.

&&

.AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/...
Issued at 1023 AM MST Tue Jan 13 2026

Dense cirrus overcast continues across the state today, but cigs
for most location s should stay well above MVFR limits through
the next 24 hours. Main issue today will be winds, with most
areas seeing gusts through the day. Most areas see gusts 20 to
30kts through the afternoon, with higher gusts at KCPR and KBYG.
A weak front moves through areas east of the Divide late this
afternoon and evening, turning winds from the north, but not
bringing any significant gusts. The front will bring a deck of
lower clouds and possible light rain to KCPR after 00Z, with
main chances for rain and low clouds between 02Z and 07Z. By
Wednesday morning, the high cirrus and any low clouds will be
thinning quickly, with likely SKC for Wednesday afternoon for
all sites.

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.

&&

$$

DISCUSSION...Lowe
AVIATION...Straub