textproduct: Cheyenne

KEY MESSAGES

- A heat wave will build into the area through Monday, producing near record high temperatures for Sunday.

- Elevated to critical fire weather conditions are expected Sunday and Monday.

- Some relief of the heat is possible during the middle of next week as a Canadian cold front moves towards the Front Range.

SHORT TERM /THROUGH MONDAY NIGHT/

Issued at 101 AM MDT Sun Aug 2 2026

The main weather headline for Sunday will be a dominate ridge, bringing benign weather along with soaring temperatures. So for today, expect highs to flirt with records highs, possibly all- time records such in Chadron with downsloping winds off of Pine Ridge. Most of the temperatures across the area are at or near the 99th percentile and/or all time maximum high temperatures. We are expecting the hottest temperatures to occur in Sioux, Dawes and, Box Butte Counties in the Nebraska Panhandle where highs top out in the low to mid 100s. Here in Cheyenne and across eastern Wyoming, highs will climb into the upper 90s to low 100s. With these forecast high temperatures and dry air, a Heat Advisory has been issued for a good portion of the CWA during the afternoon hours on Sunday. The other thing that we are monitoring with the southerly winds across the Nebraska Panhandle are the increased fire weather concerns as min RH values dip to and below 10 percent. Therefore, Red Flag Warnings are in effect for this afternoon across the Nebraska Panhandle while a two-day Red Flag Warning is out for our far western fire zones of Carbon County as there will be poor overnight RH recovery. Hi-res guidance continues to indicate a very low risk of a shower or two coming off of the mountains this afternoon, but with the current state of the environment, these showers will be nothing more than VIRGA and only produce gusty winds at the surface.

Some changes are in store at the start of the work week as the ridge that dominated weather over the weekend pushes off to the east, allowing a cold front to dive south across the region by Monday afternoon. This will bring a cooler air mass which allows temperatures to tank ever so slightly from the day prior. Many locations west of the I-25 corridor will see highs top out in the mid to upper 80s while highs to the east top out in the low to mid 90s. The other thing of note will be the possibility of gusty winds Monday as the surface gradient tightens, so expect gusts up to 30 mph for many location across southeast Wyoming and the Nebraska Panhandle. Due to these gusty conditions coupled with dry fuels and ongoing lack of widespread precipitation, elevated fire weather concerns will continue into Monday.

LONG TERM /TUESDAY THROUGH SATURDAY/

Issued at 101 AM MDT Sun Aug 2 2026

Will keep this long term discussion short a sweet as there is not much to talk about with the synoptic set-up that will take hold over the region. Starting off the long term period, Tuesday marks a day that we get a shot of cooler air as an upper-level trough digs south. This will allow a surge of cooler air to infiltrate the CWA, resulting in highs only topping out in the mid to upper 70s. A nice break from the relentless heat that we have been experiencing. But, don't get to excited with a cooler day and if it will continue, this is short-lived as we begin to heat right back up mid-week as ridging begins to build back into the region. As ridging takes a hold, we will remain dry with heat building into Thursday as highs will top out in 90s east of the I-25 corridor and mid to upper 80s to the west. The trend heading into next weekend continues as the ridge becomes well established, we look to remain dry and hot. Possibly breaking more temperature records, so stay tuned...

AVIATION /18Z TAFS THROUGH 18Z MONDAY/

Issued at 1128 AM MDT Sun Aug 2 2026

VFR conditions will prevail through the TAF period. Another hot and dry day is expected across SE Wyoming and the Nebraska Panhandle with a few high-based cumulus along with some high clouds aoa 20 kft. The main hazard these next 24 hours will be gusty winds, primarily for the Nebraska terminals after 02Z thanks to the onset of a 40-45 knot SE low-level jet, which will gradually veer to SW throughout the night as the boundary layer decouples and we continue to stabilize. Added the mention of low-level wind shear around 2 kft at KCDR, KBFF, and KAIA to account for this. Confidence in LLWS is lower at KSNY so did not include in the TAFs at this time. Otherwise, expect prevailing southerly flow at the surface before a cold front moves through the area around 14Z Monday, which will shift the winds out of the northwest.

CYS WATCHES/WARNINGS/ADVISORIES

WY...Heat Advisory until 9 PM MDT this evening for WYZ101-102-104- 107>109-111-118-119. Red Flag Warning until 9 PM MDT Monday for WYZ421>423. NE...Heat Advisory until 9 PM MDT this evening for NEZ002-003- 019>021-054-055-095-096. Red Flag Warning until 9 PM MDT this evening for NEZ434>437.