textproduct: Western and Central Wyoming

KEY MESSAGES

- Today will be the hottest day of the week with isolated thunderstorms mainly in southern and western Wyoming, with a 15-20% chance of a couple isolated storms pushing down the Wind River Basin after 4-5PM.

- Monsoonal moisture increases on Saturday with more numerous showers and thunderstorms, some may produce heavy rain and local flooding. Marginally severe weather looking more possible in the afternoon across Natrona/Johnson Counties, with damaging winds and small hail the main threats at this time.

- Lingering moisture will bring a daily chance of showers and thunderstorms into early next week, with temperatures more seasonable for this time of year pushing towards the end of August.

AVIATION /12Z TAFS THROUGH 12Z SATURDAY/

Issued at 429 AM MDT Fri Aug 21 2026

Mainly VFR conditions are expected through 12Z Saturday. After a mainly dry start there will be another day of isolated showers and thunderstorms. We kept the PROB30 groups at all TAF sites that had them before (KRIW, KLND, KJAC, KBPI and KPNA). With recent model trends we also added a group to KRKS starting at 20Z this afternoon. Most showers and storms will have little rain. However, wind gusts of 40 knots will be possible in and around any shower or thunderstorm. Most showers should end by 04Z. A few showers may linger in vicinity of KJAC, KBPI and KPNA overnight, but with chances generally 20 percent or less, we left them out of the TAFs for now. Most locations should see winds generally less than 11 knots except near any showers or thunderstorms. An exception will be in vicinity of KCPR where gusts to 20 knots will be possible.

Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for the latest information on icing and turbulence forecasts.

AVIATION /12Z TAFS THROUGH 12Z SATURDAY/

Issued at 430 AM MDT Fri Aug 21 2026

Mainly VFR conditions are expected through 12Z Saturday. After a mainly dry start there will be another day of isolated showers and thunderstorms. We kept the PROB30 groups at all TAF sites that had them before (KRIW, KLND, KJAC, KBPI and KPNA). With recent model trends we also added a group to KRKS starting at 20Z this afternoon. Most showers and storms will have little rain. However, wind gusts of 40 knots will be possible in and around any shower or thunderstorm. Most showers should end by 04Z. A few showers may linger in vicinity of KJAC, KBPI and KPNA overnight, but with chances generally 20 percent or less, we left them out of the TAFs for now. Most locations should see winds generally less than 11 knots except near any showers or thunderstorms. An exception will be in vicinity of KCPR where gusts to 20 knots will be possible.

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.