textproduct: Cheyenne

KEY MESSAGES

- A High Wind Warning has been issued for the Arlington and Bordeaux areas into Sunday.

- Areas of blowing snow will impact travel conditions in the typical wind prone locations.

- After a potential short lull, high winds return Sunday night into Monday for the wind prone areas.

- A long duration, high-end, wind event is increasingly likely in the Tuesday through Thursday time period. Areas of snowfall will be possible too, but the details remain uncertain.

SHORT TERM /THROUGH SUNDAY NIGHT/

Issued at 300 PM MST Sat Dec 6 2025

High wind warnings have been allowed to expire or cancelled early as winds have widespread weakened across the region this afternoon. However, a fresh high wind warning has been issued for our usual wind prone locations (Arlington and Bordeaux), but this event looks a bit more marginal than the previous as in house guidance shows probabilities only around 40-50%, but knowing how the region can over perform combined with a favorable Craig to Casper pressure gradient near the surface, our gap locations should at least see a brief 58-60 mph wind gust before the afternoon. Otherwise we had some over performing snow this afternoon as a quick and stout band moved across the region, bringing a brief inch or so of snow into Cheyenne alongside some quick visibility reductions. As for our ongoing winter products, the advisory for Arlington will likely be allowed to expire in a few hours, with another few inches in the mountains this evening before those warnings are allowed to expire as well.

Into Sunday, brief ridging should help to bring the quieter conditions to the region aside from some light mountain snow and the aforementioned wind potential, but this just sets the stage for the more complex setup we'll be seeing next week as this ridging fights an arctic airmass that will lead to high winds and some lower elevation snow potential.

LONG TERM /MONDAY THROUGH SATURDAY/

Issued at 300 PM MST Sat Dec 6 2025

It looks like we are still on track for a prolonged high-end wind event in the long term that starts Monday, continuing into Thursday. However, there remains some uncertainty due to the placement of an amplifying ridge, or not, that builds across the West Coast. The latest deterministic runs paint a similar picture, all have a stout ridge building across the West Coast through Thursday, any variance in placement and strength will be key in this afternoon's forecast package. If said ridge becomes more amplified, pushing north, this will keep the strong upper level northwest flow pouring into our CWA which will help keep the strong winds at the surface. Not only this, but this scenario will maintain milder temperatures and drier conditions. If this ridge at 500mb is less amplified, an arctic front will dive south, promoting cooler temperatures along with a break in the strong winds. With a surge of cooler temperatures with an arctic front, if there is any precipitation that falls will be in the form of snow. So, with this all being said, the forecast is pretty tricky in the extended and for this afternoon's package, minimal changes/edits will be done in the long term to keep continuity. So, with the needle pointing to the amplified scenario, expect highs to top out in the 40s and 50s, cooler west of I-25. So, lets get to the main story in the extended, a prolong high-end wind event from Monday into Wednesday, possibly Thursday. Monday appears windy, but by the nighttime hours, the winds really ramp up. A strong upper level ridge will slide south, tightening the pressure gradient. Ensemble members still have a 65 knot 700mb jet across southeast Wyoming building into Tuesday. With these winds aloft, negative Omega (GFS) will mix them down to the surface and expect gusts to top out in the 70 to 80 mph range, strongest in the typical wind prone areas across southeast Wyoming. Winds slowly wind down through Wednesday and by Thursday they will rapidly diminish in the afternoon hours. Like with anything, things can change and so can model solutions, so stay tune for future updates.

AVIATION /06Z TAFS THROUGH 06Z MONDAY/

Issued at 1040 PM MST Sat Dec 6 2025

A backdoor cold front has pushed low CIGs and patchy fog into the Nebraska panhandle, which will lead to periods of LIFR and IFR conditions into Sunday morning. In addition, isolated snow showers still linger over the area, and a quick drop in VIS cannot be ruled out through Sunday morning. Drier conditions will work into the area midday Sunday, but gusty west to northwest winds will continue.

CYS WATCHES/WARNINGS/ADVISORIES

WY...High Wind Warning from 2 AM to 2 PM MST Sunday for WYZ106-110. Winter Storm Warning until 5 AM MST Sunday for WYZ112-114. NE...None.