textproduct: Cheyenne

KEY MESSAGES

- Widely scattered showers and thunderstorms expected on Saturday. An isolated severe storm could be possible.

- Mostly dry and warmer weather will prevail for Sunday through Thursday, with breezy conditions in the afternoons and evenings.

SHORT TERM /THROUGH SUNDAY/

Issued at 221 PM MDT Fri May 8 2026

A quiet afternoon continues across the area with seasonably warm temperatures and fair weather cumulus. A few light pop up showers are moving into the northern Nebraska panhandle from South Dakota, but given the dry low-levels, not more than a sprinkle is expected. Any showers will dissipate by this evening, leading to an uneventful overnight.

An upper-level shortwave will push into the CWA on Saturday, bringing precipitation chances and a cool front with it. The front will likely move across the forecast area during the afternoon, providing lift for storms to develop. A majority of storms will not be severe, however an isolated severe storm could be possible, mainly east of the Interstate 25 corridor. The environment here could support hail with MUCAPE up to 800 J/kg, as well as severe wind gusts with DCAPE nearing 1000 J/kg. PWATs with this system look pretty good so locations that do receive one of the scattered storms are likely to see accumulating precipitation. Storms will move from northwest to southeast across the CWA, with storms entering the forecast area by the afternoon. Storms will move across the area, reaching the southern half of the forecast area by mid to late afternoon. Most storm activity will dissipate after the evening hours, with a few lingering showers possible through midnight.

A warming and drying trend is expected for Sunday as the upper-level shortwave moves out and is replaced by a strong ridge. Warmer and dryer air will move in aloft, leading to a mostly sunny day for Mother's Day. Temperatures will be near average in the 60s and 70s with minimal chances for precipitation. A pleasant day to be outside!

LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/

Issued at 221 PM MDT Fri May 8 2026

Sunday night/Monday...The next shortwave trough aloft moves across eastern Montana and the Dakotas, sending its associated cold front into southeast Montana. Dry conditions should prevail due to dry low and mid levels. Moderate confidence in breezy to windy conditions as the low and mid level gradients strengthen for Monday afternoon. Prefrontal lifting and 700 mb temperatures near 13 Celsius will produce summer like maximums.

Tuesday...Brisk northwest flow aloft continues, and dry conditions remain with scarce low and mid level moisture availability. Cooler temperatures in the post cold frontal sector as upslope north and northeast winds develop.

Wednesday...Another warming trend ensues as 700 mb temperatures reach 14 Celsius, yielding highs in the upper 70s to near 90 degrees. The dry northwest flow aloft prevails, and with warm mid level temperatures producing enough convective inhibition, also known as CIN, no showers or thunderstorms are anticipated.

Thursday...The ridge aloft moves further east over western Wyoming. Some pseudo like monsoonal moisture will affect Wyoming and Colorado, and there is a moderate likelihood that isolated to scattered afternoon and evening showers and thunderstorms will develop in a swath from Chadron to Cheyenne, across much of the forecast area. Model solutions have been changing, lowering confidence, so will keep it dry for now to blend in with our neighboring offices at Denver/Boulder, Grand Junction, Riverton, Rapid City and North Platte, though this day promises hope for some beneficial rainfall.

Friday...Negatively tilted and fast moving shortwave trough aloft progged to move across Wyoming, sending a Pacific origin cold front to a Lusk to Cheyenne line by late afternoon. This trough aloft will be moisture scant, thus only isolated showers and thunderstorms are anticipated.

AVIATION /06Z TAFS THROUGH 06Z SUNDAY/

Issued at 1145 PM MDT Fri May 8 2026

Generally, VFR conditions will prevail across all terminals for most of this TAF period. However, there will be the threat of strong to severe thunderstorms by 18Z Saturday. These storms will primarily be wind producers along with bringing ample lightning. Hail is not out of the realm of possibility, but we are not expecting severe hail. So, expect VIS and CIGs to briefly dip if a storm comes close to or goes over a terminal. Otherwise, -SHRA will impact most of the sites, reducing VIS ever so slightly for most of the day.

CYS WATCHES/WARNINGS/ADVISORIES

WY...None. NE...None.