textproduct: Western and Central Wyoming

KEY MESSAGES

- Light snow lingers from Muddy Gap to Casper that will diminish and push east by sunrise Saturday morning.

- Colder, more seasonable temperatures into the weekend with mainly dry conditions Saturday.

- The next weather system will affect the state Sunday through Wednesday with minor impacts expected.

- Dry conditions and a warming trend for the end of the week and into next weekend.

DISCUSSION

Issued at 130 AM MDT Sat Apr 25 2026

IR currently depicts the deep upper level low near the Montana/Canada border with elongating troughing dipping southwest in a positively tilted fashion. The shortwave from Friday continues to progress through eastern portions of the state into the High and Great Plains. Radar shows some lingering light snow showers from Muddy Gap to Casper that will diminish and push east into the early morning hours before daylight Saturday. With that, a brief lull for Saturday will occur with dry slotting evident on WV as the bottom of the upper level trough flattens ahead of the next shortwave into Sunday morning. More sun and seasonable temperatures will be had for Saturday but attention turns to Sunday and beyond through mid week with the next low to affect the CWA.

Sunday looks to be the most active day in terms of precipitation with more PVA anomalies with the southwest flow aloft. The L/W trough deepens with the increased divergence aloft that will be more focused for areas east of the Divide with this wave for the lower basins. Mountain snow will still occur across the entire CWA, with highest impacts to the western Winds and western Bighorns due to the aforementioned southwest flow down to the mid levels. South Pass to the passes in the Bighorns will see the highest of impacts as the most likely snowfall totals at this point in time of 6 inches or more (30-50%). Green River Basin to the Wind River Basin looks to see a rain/snow mix during the day Sunday turning to a light snow accumulation overnight into Monday, but overall the impacts look to be minor at best into the early parts of next week.

Monday and Tuesday will see another couple rounds of lighter precipitation as the trough fills with decreased upper level divergence as the EC continues to be on point pushing it out by late Wednesday. The more seasonable to slightly cooler temperatures will continue through Wednesday and even for Thursday morning low temperatures. Weak ridging looks to build back in for the end of the work week and into next weekend with a slight warming trend and mainly dry conditions to be had heading into the new month of May. Here is to hoping these end of April showers bring those early May flowers....

AVIATION /06Z TAFS THROUGH 06Z SUNDAY/

Issued at 940 PM MDT Fri Apr 24 2026

West of the Divide...KJAC/KRKS/KPNA/KBPI Terminals

Skies continue to thin out from the northwest, with mostly SKC skies to start the forecast period. Similar conditions are expected to reach KRKS by 10Z. There is a less than 10% chance for fog near KPNA and KJAC through 15Z. Wind gusts around 20kt will develop at KRKS, KBPI and KPNA between 18Z and 20Z and subside by 01Z. BKN-OVC FL120-180 clouds will increase from the south after 00Z.

East of the Divide...KCPR/KCOD/KRIW/KLND/KWRL Terminals

Main issue through 16Z will be low clouds and fog for KCPR/KRIW/KLND. KCPR/KLND will be IFR/LIFR thresholds below 1000 feet most of the night, with KCPR possibly seeing very light snowfall as well through the night. Added moisture from snowmelt may also bring some sfc fog to these regions as well, especially KLND. Clearing skies by 16Z with VFR conditions, along with light winds, expected at 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.