textproduct: Western and Central Wyoming

KEY MESSAGES

- Winds and shower activity has diminished and mainly come to an end into early Tuesday morning.

- Chilly temperatures by Tuesday morning under improved skies allowing for mid 20s to mid 30s by sunrise.

- Warming trend and mainly dry conditions for the remainder of the week and into the weekend with only limited shower activity each afternoon for northern mountains.

- Elevated fire weather conditions persist east of the Divide with low humidity values but only slight breeze throughout each afternoon/early evening.

DISCUSSION

Issued at 100 AM MDT Tue Jun 30 2026

IR currently depicts the main upper level low pushing northeast into the upper Great Plains as the troughing in its wake fills with decreased divergence aloft. WV continues to show distorted fingers of the PFJ, mainly into Canada now with little support to the aforementioned upper level low. Radar activity has diminished for the overnight hours as skies have improved in its wake. This will allow for one more cold morning Tuesday allowing for western valleys to see mid 20s to mid 30s with minor frost likely for areas of the upper Green River for the usual suspects between Pinedale to Bondurant.

Otherwise, southwest flow continues aloft Tuesday and Wednesday with a couple minor shortwaves clipping the northern counties but mainly into Montana. Each afternoon and evening will see some limited coverage in shower activity for the northern mountains (10-20%) with a rumble of thunder even less likely <10% due to weak CAPE values less than 100 J/kg. This pattern continues for the remainder of the work week as a warming trend and mainly dry trend extends through the weekend. A more zonal pattern by the weekend as the high to the south builds in further north increasing convergence aloft and weaker flow. Afternoon high temperatures back to the 80s east of the Divide and 70s to the west for the holiday weekend with no significant winds even to speak of. Each afternoon/early evening will see slight breezes up to 20-25 mph for wind prone areas east of the Divide but otherwise calm for Wyoming standards. Even with low relative humidity values, fire weather concerns will be limited to elevated throughout the week and weekend. This upper level high continues to build in from the south into next week with some longer term model ensembles showing some record heat coming by mid to end of next week, welcome to July....

AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/

Issued at 1100 PM MDT Mon Jun 29 2026

VFR conditions across nearly all terminals for the start of the TAF period. The one exception to this is KJAC where light rain shower have lingered through the evening. Ceilings have gradually lifted but are likely to linger through much of Tuesday morning. That being said a brief period of MVFR ceilings cannot be ruled out at times. Winds will continue to decrease across all terminals with a light breeze through the overnight. Winds are expected to increase some to 15 to 25 knots around 14Z mainly at KCPR and KCOD. Showers begin developing after 18Z Tuesday mainly across western and southwestern WY. Coverage begins to spread farther north and east after 00Z Wednesday with slight chances possible at KLND, KRIW, KWRL, and KCPR. Overall showers are expected to be light with minimal impacts but a few gusty outflow winds cannot be ruled nearby any developing showers. Dry conditions return after 03Z for all terminals and prevailing into the end of the TAF period. Mountains are likely to be obscured especially across western WY with conditions improving during the day Wednesday.

RIW WATCHES/WARNINGS/ADVISORIES

None.