textproduct: Cheyenne

KEY MESSAGES

- Strong ridging aloft will produce a dry and hot period for today through Wednesday, with the primary challenges being the above normal heat and fire weather conditions.

- Expect a very slow cooling trend for maximum temperatures from Wednesday through Monday. Monsoonal moisture will slowly increase late this week and over the weekend and on Monday, helping to produce a slow increase in late day shower and thunderstorm coverage each day.

SHORT TERM /THROUGH TUESDAY NIGHT/

Issued at 140 PM MDT Mon Jul 13 2026

No major changes to the forecast package this afternoon as overall conditions remain dry and hot through the short term. An upper level ridge over the northern plains will remain firmly centered over the northern portion of the country, with some swaying possible towards the Great Lakes but ultimately ending right back where it began by Wednesday morning. This small shift should allow for highs on Tuesday to drop ever so slightly, but don't expect much relief as temperatures hold steady in the upper 80's to low triple digits much like today, continuing our heat advisory through the middle of the week. At the surface, a trough across the Rockies will continue producing an enhanced surface pressure gradient that, while not strong enough to worry about high wind hazards, will continue to fuel our critical fire weather environment through at least the middle of the week. Our summer dry heat continues to persist into the middle of the week, but moving into the long term we may finally see some moisture return at least.

LONG TERM /WEDNESDAY THROUGH SUNDAY/

Issued at 140 PM MDT Mon Jul 13 2026

Wednesday...Monsoonal moisture starts to approach our western counties from the south and west, though should remain over western Wyoming and western Colorado, thus dry.

Thursday...Looks like some monsoonal mid level moisture may advect across our western zones like Carbon County, producing isolated afternoon and evening thunderstorms. Dry elsewhere.

Friday...Ridging aloft remains entrenched over our region, while there should be a slight increase in mid level monsoonal moisture, helping to produce isolated to widely scattered showers and thunderstorms in the afternoon and evening, primarily west of I-25.

Saturday...With the ridge aloft remaining parked over Wyoming, and warm mid level temperatures producing enough CIN, convective inhibition, will limit areal coverage to isolated showers and thunderstorms.

Sunday...Low, and especially mid level monsoonal moisture increases somewhat, thus we anticipate a corresponding increase in late day shower and thunderstorm coverage, especially over and near the Snowy, Sierra Madre and Laramie Ranges.

Monday...Monsoonal moisture at mid levels increases further, aiding in another increase in late day shower and thunderstorm coverage, with coverage increasing to scattered, 30 to 60 percent POPS, with the greatest coverage over and near our mountain zones.

AVIATION /18Z TAFS THROUGH 18Z TUESDAY/

Issued at 1129 AM MDT Mon Jul 13 2026

The region will remain on the western periphery of an east to west oriented ridge aloft. Nearly clear skies will prevail through the TAF period.

Wyoming and Nebraska TAFS...Clear skies and VFR prevail. Expect gusty winds of 25 to 35 knots until late afternoon or early evening, except for light winds at Rawlins, then winds will subside overnight.

CYS WATCHES/WARNINGS/ADVISORIES

WY...Red Flag Warning until 8 PM MDT Wednesday for WYZ417>420-423- 427-430>433. Heat Advisory until midnight MDT Wednesday night for WYZ101- 102-107-108-118-119. NE...Red Flag Warning until 8 PM MDT Wednesday for NEZ434>437. Heat Advisory until midnight MDT Wednesday night for NEZ002- 003-019>021-054-055-095-096.