textproduct: Cheyenne

KEY MESSAGES

- Dry conditions expected through Friday alongside critical Fire Weather conditions.

- Moisture and cooler temperatures return for the weekend, with another shot of cooler air to start next week.

SHORT TERM /THROUGH SATURDAY NIGHT/

Issued at 235 PM MDT Thu Sep 10 2026

Another dry, warm and windy day continues across the area. Red Flag Warnings remain in place for the Laramie Range and westward for relative humidity in the single digits and wind gusts up to 40 MPH. These conditions will continue through the evening hours until the Red Flag Warning expires at 8 PM. Humidity recoveries overnight are expected to be poor across most of the forecast area. A shortwave entering Wyoming will increase winds overnight, contributing to greater downslope, keeping surface humidity from rising. For most of the CWA, the maximum humidity overnight will stay under 30 percent.

Fire weather conditions continue into Friday, but shift further east into the Nebraska panhandle. The aforementioned shortwave will actually usher in a bit of mid-level moisture, raising relative humidity enough to get clouds and maybe even a very light shower early in the morning per Hi-Res guidance. Relative humidity out west will stay above critical thresholds, however relative humidity in the Nebraska panhandle will remain around 15 percent as the dry air stays in place one more day. Red Flag Warnings are in effect for the Nebraska panhandle for Friday afternoon. Windy conditions are expected across the forecast area as zonal flow still persists. On top of fire weather concerns, cannot rule out a few isolated showers and thunderstorms developing later in the afternoon ahead of an incoming cold front.

A cold front will move across the area Friday night, raising relative humidity and bringing an end to fire weather conditions for Saturday. Highs on Saturday will be cooler behind the front as 700 mb temperatures drop about 6C. Instead of highs in the upper 80s and 90s, most cities will have pleasant temperatures in the 70s. Once again, cannot rule out some minor precipitation chances behind the front, however instability and moisture are lacking.

LONG TERM /SUNDAY THROUGH THURSDAY/

Issued at 235 PM MDT Thu Sep 10 2026

On Sunday an upper level system makes its way into the PNW. Guidance is showing the potential for storms with this return flow ahead of the upper level system's passage. The main risk area for these storms is east of I-25. Sunday night into Monday morning shows a cold front passing over the CWA. After this front moves out, a ridge starts to build, bringing cooler temperatures and dryer air. Some storm and shower activity is possible Tuesday evening with return flow. A shortwave passes through on Thursday evening, allowing the ridge to continue to build. 700mb temperatures are in the 10-15C range in this long term period. Temperatures start to cool off and feel more like fall as the week progresses.

AVIATION /00Z TAFS THROUGH 00Z SATURDAY/

Issued at 1021 PM MDT Thu Sep 10 2026

VFR will remain in place through the TAF period with just a few mid and upper-level clouds overnight. Westerly winds will ramp up shortly after sunrise with gusts as high as 30 knots, before a cold front moves through late Friday evening, resulting in lighter and variable winds ranging from 10-15 knots, primarily for the Wyoming terminals. There is a low chance for high-based showers and thunderstorms late in the afternoon and early evening which will be capable of producing gusty and erratic winds. Overall coverage is expected to be low, and confidence isn't high enough to include a PROB30 group at this time.

CYS WATCHES/WARNINGS/ADVISORIES

WY...Red Flag Warning from 11 AM to 7 PM MDT Friday for WYZ433. NE...Red Flag Warning from 11 AM to 7 PM MDT Friday for NEZ434>437.