textproduct: Western and Central Wyoming

KEY MESSAGES

- Temperatures climb to well above normal this weekend, with widespread highs in the 50s and 60s. Johnson County is forecast to see temperatures around 70s degrees on Sunday.

- Mostly dry weather, occasional afternoon breezy winds, and widespread highs in the 50s and low 60s are forecast Monday through Friday.

DISCUSSION

Issued at 111 AM MST Sat Nov 7 2026

A pleasant November day is in store for the area today. 1AM water vapor imagery shows a positively tilted upper level ridge extending from northern California to the Northern Rockies. The only feature of note, although largely insignificant, is a weak vorticity maximum over western Montana. This feature will traverse over northwestern and northern Wyoming late morning through the early afternoon bring increased high level clouds to the area and some breezy winds. Breezy winds are forecast to occur in the Upper Wind River Basin, around Cody and the Absarokas, across Natrona County, and northern Johnson County. Otherwise, high temperatures range from the upper 40s to mid 50s for locations west of the Continental Divide and 50s to low 60s east of the Continental Divide.

On Sunday, flow aloft becomes more zonal and strengthens as the aforementioned ridge folds over and flattens. Overall warmer temperatures are expected due to a surface high shifting into the Intermountain West, 700mb temperatures in the 3C to 9C degree range, and breezy southwest winds ahead of a weak Sunday evening cold front. These 700mb temperatures translate to 50s for areas west of the Continental Divide and upper 50s to 60s for most locations east of the Continental Divide. Johnson County will be the warmest with highs in the low 70s. There is a 90% chance that winds will exceed 30 mph across the Absarokas, eastern Wind River Mountains, and from South Pass to Casper and into southeast Johnson County. Winds are forecast to be rather light elsewhere. Given the abnormally warm temperatures, gusty winds, and relative humidity values around 20% (80% to 90% chance) across Johnson County, elevated fire weather conditions are expected Sunday afternoon.

The Sunday evening cold front will be inconsequential, with only slightly cooler temperatures forecast for Monday. There is high confidence in fairly strong zonal flow (60 to 80kts) aloft on Monday. This means that breezy winds with gusts around 20 to 25 mph are expected in the same locations as Sunday in addition to across Yellowstone National Park and near Dubois. There is consensus amongst model guidance that a shortwave will trek across the area on Tuesday. There looks to be just enough mid-level moisture for light precipitation to occur across northwest Wyoming. However, chances of anything greater than 0.01" of liquid tops out at 40%. Another ridge is forecast build across the western CONUS Wednesday and shift into the Intermountain West for Thursday and Friday. This means that the overall dry conditions and much above normal temperatures is forecast to persist into mid-November.

AVIATION /06Z TAFS THROUGH 06Z SUNDAY/

Issued at 1021 PM MST Fri Nov 6 2026

VFR conditions are expected through the period with no precipitation in the area. KCOD will see a frequent breezy downsloping wind overnight. Otherwise, wind remains light at terminals until a southwest wind picks up at KCPR after 16Z. High clouds are expected to move in tonight, clearing from west to east by late Saturday morning.

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

None.