textproduct: Western and Central Wyoming

KEY MESSAGES

- A weather system moving through the region tonight keeps it cool and mostly cloudy conditions.

- Tonight's precipitation will be focused over the mountains and western valleys, but basins in central and northern Wyoming will see hit- or- miss scattered showers as well. - Accumulating snow is likely in the higher elevation mountains tonight through Sunday, mainly above 10000 to 11000 feet.

- After the current weather system exits Sunday night, dry conditions prevail with temperatures gradually warming up over the first half of the work week.

DISCUSSION

Issued at 1235 AM MDT Sun May 31 2026

As expected, areas west of a Cody-to-Rock Springs line had the highest amounts of precipitation since 7am Saturday ranging between 0.15" to 0.70". Roughly add another 0.20" to include the precipitation that was occurring earlier Saturday morning/Friday night. Showers will be mainly confined to western and northern portions of the CWA early this morning as the upper low continues to slowly track toward the northeast. An area of showers will continue over southern portions of the Jackson Valley/northern portions of Star Valley and into the Upper Green River Basin, with additional showers from southern MT moving over YNP and the rest of the Jackson Valley around 10Z this morning. Showers and thunderstorms developed over far northern portions of Johnson County around 05Z and have been backbuilding toward Kaycee through 06Z. This activity will continue to track westward over the Bighorns through 12Z this morning.

Showers will become concentrated over northern portions after sunrise this morning as the upper low moves over the Black Hills and pivots over far eastern MT through the day. Any showers over the Wind River Basin and Natrona County will be isolated and conditions will remain dry elsewhere in the CWA. Precipitation amounts will be much lower with these showers, ranging between 0.10" and 0.20" through the day. Snow levels will stay around 9000-10000ft, with lower levels around 7500 over YNP and the Absarokas. A brief heavy downpour cannot be ruled out, especially in the Bighorn Basin, but is not expected. Precipitation will end from west to east through the evening. Otherwise, wind will be the main feature today with gusts of 25 to 35 mph developing over areas west of the Divide after 15Z and spread into Natrona County by 18Z. Similar winds will develop near Dubois and Crowheart after sunrise and spread down the basin toward Riverton. These winds will decrease across the area in the evening, lingering the longest in the Wind River Basin (which should finally end around 07Z Monday).

Isolated showers and thunderstorms will be possible Monday, as a shortwave moves over the Cowboy State. Winds aloft will be southwesterly as a trough develops over the Northern Rockies from the remnants of the upper low. Most of the convection looks to be isolated across the CWA, occurring along and east of a line from the Bighorns to western Sweetwater County. An additional area of isolated showers will be possible over far northwestern portions. Wind gusts up to 45 mph will be the main threat, as instability will be pretty modest between 200-500 J/kg. Tuesday and Wednesday look to stay mainly dry, with west-southwest winds aloft keeping any potential convection over far eastern portions of the state. Showers and thunderstorms will be possible again Thursday, with dry conditions returning for Friday. Temperatures will be above normal from Tuesday to Friday, with highs in the upper 70s into the 80s. Hot and dry conditions look to return for next weekend.

AVIATION /06Z TAFS THROUGH 06Z MONDAY/

Issued at 1024 PM MDT Sat May 30 2026

The center of the weather system is passing through central Wyoming currently. As it slides northeast tonight into Sunday, rain and isolated thunderstorms will continue, mainly for KJAC, KCOD, and KWRL. Conditions will drop to MVFR/IFR at KJAC tonight and at other terminals impacted by heavier showers and storms. Precipitation chances end for remaining terminals Sunday evening, with KWRL being the last impacted before the weather system moves out of the area.

Wind will increase Sunday morning at most terminals with 10-20 knots and gusts of 20-30 knots through Sunday afternoon. Stronger wind will occur at KRKS, with gusts up to 40 knots possible Sunday afternoon. Wind will decrease substantially by 02Z-03Z Monday across the area. Frequent mountain obscuration continues across western and northern portions of the area through Sunday morning, with improving conditions Sunday afternoon into Sunday evening.

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.