textproduct: Cheyenne

KEY MESSAGES

- Near record high temperatures are expected to begin Saturday and continue through Monday.

- Widely scattered high-based showers and thunderstorms with potential for strong gusty winds are expected Saturday and Sunday.

- Another surge of monsoon moisture will arrive Monday, increasing rainfall chances for the early part of the work week.

SHORT TERM /THROUGH MONDAY NIGHT/

Issued at 322 PM MDT Sat Jul 25 2026

A hot day continue across much of the forecast area with high temperatures east of the Laramie Range skyrocketing above 100 degrees. A Heat Advisory remains in place through Monday evening for this area as little relief can be expected over the several days. Northern Sioux and Dawes Counties will be the hottest locations, with temperatures nearing 110 degrees. Due to this, these counties are under an Extreme Heat Warning. Some locations have been lucky enough to see a brief reprieve from the heat this afternoon. Scattered showers and thunderstorms have developed early this afternoon and continue to pop up across the CWA. Some cloud cover and rain has cause some locations to see a 5 to 10 degree drop in temperatures. Hi-Res guidance shows these showers and storms continuing well into the evening hours thanks to a subtle shortwave passing through the ridge in place. Cannot rule out an isolated severe storm or two across the High Plains this afternoon and evening. The primary concern would be severe wind gusts. Model soundings show strong inverted-V profiles thanks to the dry surface from hot temperatures and ample moisture in the mid-levels from the influence of the monsoon. This creates an environment with DCAPE values over 1500 J/kg, which could lead to severe wind gusts. Small hail will also be possible in storms, but is not the primary concern. PWATs are also 1.00+ inch meaning heavy rain will be possible in storms. Storms are also pretty slow moving, but flooding will likely not be an issue with these high based storms. Heading into the overnight hours, most storm activity will be done by midnight, but a few lingering showers could be possible after that. Temperatures overnight will be abnormally warm, with a few locations likely to set record high low temperatures. This will not provide much relief from the heat as it allows temperatures to warm up quicker on Sunday.

Sunday will be virtually the same as Saturday, with continued hot temperatures and the chance for scattered showers and storms. Temperatures will have the potential to be a degree or two warmer due to decreased cloud cover. In turn, coverage of precipitation will likely be lower than Saturday due to a weaker disturbance moving through the ridge. Hi-Res guidance keeps most of the shower and storm activity around the Interstate 80 corridor. Timing of storms will be similar to today with convection developing early in the afternoon and continuing into the evening hours. Storms may go past midnight as Hi-Res guidance shows convection maintaining well into the overnight hours. Like today, wind and moderate to heavy rain will be the main concern in storms with the dry low-levels and monsoon in place.

As the ridge aloft ever so slightly weakens on Monday, temperatures will begin to "cool". High temperatures on Monday will fall about 5 degrees compared to Sunday. A stronger shortwave moving through the ridge will likely lead to increased cloud cover as well as additional chances for showers and storms.

LONG TERM /TUESDAY THROUGH SATURDAY/

Issued at 322 PM MDT Sat Jul 25 2026

Tuesday and Wednesday afternoon look to be our best chances for rainfall. The ensembles are still in fairly decent agreement of higher PW values for our rainfall chances Tuesday and Wednesday. Temperatures are looking to remain quite warm in the lower elevations, with near seasonal temperatures for the higher elevations. This moisture does bring chances for marginal severe storms throughout the week, where a few gusts around 60mph cannot be ruled out. As the week progresses the ridge starts to weaken. This will decrease the amount of moisture trapped underneath it. PW values decrease as the week progresses as well, which lowers the chances for thunderstorms and showers each day.

AVIATION /18Z TAFS THROUGH 18Z SUNDAY/

Issued at 1146 AM MDT Sat Jul 25 2026

The main aviation concern today will be scattered showers and thunderstorms with potentially moderate to heavy rain at times. Storms will develop during the afternoon and evening hours. Slow moving storms may drop heavy rain that could reduce visibility down to MVFR or IFR criteria. Strong and erratic wind gusts will also be possible in and around storms.

CYS WATCHES/WARNINGS/ADVISORIES

WY...Heat Advisory until 9 PM MDT Monday for WYZ101-102-107-108-118- 119. NE...Extreme Heat Warning until 9 PM MDT Monday for NEZ002-095. Heat Advisory until 9 PM MDT Monday for NEZ003-019>021-054-055- 096.