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.

- Isolated high-based thunderstorms possible on Thursday through Saturday mainly near the mountains. Arrival of the monsoon possible later in next weekend.

LONG TERM /WEDNESDAY THROUGH SUNDAY/

Issued at 121 PM MDT Sun Jul 12 2026

The weather over the medium to long range will be dominated by the quasi-stationary upper level high. This upper level high forecast to remain over the south-central to central United States, including the Rocky Mountain region. Therefore, not expecting conditions to change too much through next week with hot temperatures. However, record high actually appear unlikely at this time since we are heading into the warmest week of the year, climatologically speaking. For early in the week, center of the 600dm upper level high will be generally located in the central Rocky Mountain region extending east into the central Great Plains. Forecast high temperatures will remain in the 90s for most of southeast Wyoming, including the high valleys west of the Laramie Range. For western Nebraska, 95 to 105 expected each day. South to southeasterly winds should continue each day with increasing confidence in a decent breezy for the late morning hours and the afternoon. This should result in slightly cooler temperatures across the south facing ridges and hills due to localized upslope, but we're talking about a difference between 91 an 96 degrees, so the overall cooling will be minimal.

As we head into later in the week and the weekend, models are now showing different solutions in regards to the position of the upper level high. The 12z ECMWF maintains the upper level high over Wyoming, Utah, and northern Colorado...similar to yesterday while the GFS and Canadian now show the center of the high drifting southeast into the south central plains. The key difference between both solutions in not necessarily the temperatures, which is still expected to be very warm to hot across the forecast area, but precipitation chances. GFS and Canadian show the Monsoon plume over Colorado and Wyoming by the weekend with increasing thunderstorm chances. Will keep an eye on this trend over the next few days, with a mention thunderstorms along and west of the Interstate 25 corridor for now.

AVIATION /06Z TAFS THROUGH 06Z TUESDAY/

Issued at 1132 PM MDT Sun Jul 12 2026

Breezy conditions are expected at most of the Nebraska panhandle terminals this evening and tonight as a low-level jet develops. Wind gusts up to 25 kts will be possible. Southeast Wyoming terminals can expect lighter winds. Similar conditions are expected tomorrow with mostly sunny skies and diurnal afternoon wind gusts.

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.