textproduct: Cheyenne

KEY MESSAGES

- Areas of fog will continue into Sunday morning. A Dense Fog Advisory remains in effect until 900 AM MST for areas along and east of the I-25 corridor, including the Cheyenne Ridge in the southern Nebraska Panhandle. - A slightly more active pattern is expected into the middle of next week, with low precipitation chances returning Wednesday into Thursday.

- Strong gusty winds are looking more likely for late Tuesday night and Wednesday for the Wind Prone areas of southeast Wyoming. Windy conditions expected elsewhere as a cold front moves into the high plains.

SHORT TERM /THROUGH TUESDAY/

Issued at 145 AM MST Sun Nov 15 2026

Current KCYS radar loop shows the sprinkles and flurries last night dissipating early this morning as the poorly organized Pacific storm system redevelops over the Texas and Oklahoma panhandle...with any remaining energy with the northern portion of the shortwave trough dissipating as well. Fog is still observed across the high plains, mainly along the I-25 corridor and the Cheyenne Ridge as it extends eastward into Kimball and Sidney Nebraska. Otherwise, some light drizzle is possible in this area, but should brief and end well before sunrise. Surface winds are already starting to shift into the southwest over Cheyenne with increasing winds out of the southwest expected for the I-25 corridor from 100 AM to sunrise. Fog and low CIGS will gradually lift with low clouds and fog remaining over the Nebraska Panhandle and far eastern Wyoming until mid morning. Kept the Dense Fog Advisory out for now, but may need to tweak the areal coverage with fog expected to lift along I-25. Will continue to monitor and adjust as need this morning.

For today and Monday, models show lingering morning cloud cover early Sunday before give way to mostly sunny skies by the afternoon with high temperatures trending back into the 50s to low 60s. Portions of the western Nebraska Panhandle will likely remain in the low 50s due to lingering low clouds. Even warmer for Monday as a Pacific shortwave ridge axis translates eastward into the Intermountain West and amplifies over the Front Range Monday morning. Surface winds will remain out of the south as the ridge axis moves into the Front Range, which is enough low level upslope to hold onto some low clouds, and possibly fog, Sunday night over Box Butte, Morrill, and Cheyenne Counties. Further west, should be enough of a westerly wind component and dry air intrusion to prevent fog development. Added some fog into early Monday morning from Sidney to Alliance. Otherwise, pleasant mid-November day expected with highs in the upper 50s to mid 60s.

All models show the next Pacific storm system rapidly moving onshore, producing rainfall as far south as southern Calif and mountain/Great Basin snowfall Tuesday. This will be our next weather maker which is forecast to impact the region late Tuesday and Wednesday. As of right now, models are not indicating a closed storm system and still show an open wave trough ejecting northeast over Wyoming and Montana. This storm track favors mountains snow, cooler temperatures, and windy conditions across southeast Wyoming (strong winds possible across the wind prone areas). Will continue to monitor this system over the next few days.

LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/

Issued at 129 PM MST Sat Nov 14 2026

The majority of the long term will feature relatively benign weather with a return to more seasonable temperatures and breezy conditions.

A pattern change will arrive on Wednesday as a trough swings into the Rockies. A cold front will move across the area, late Tuesday night or early Wednesday morning, leading to high temperatures in the 40s and 50s--roughly average for this time of year. This front will be mostly dry, with predominately west winds promoting a dry downslope environment. The mountains, however, could see a quick shot of snow, with the Sierra Madre Range picking up a few inches of accumulation. The Snowys will likely be shadowed and not see much in the way of accumulations. The bigger concern with the frontal passage will be strong winds. Marginal high winds will be possible as MSLP gradients compress from the front. Winds aloft will increase up to about 50 kts with decent subsidence, so cannot rule out 60 MPH gusts during the day in the typical southeast Wyoming wind prones.

Seasonal temperatures will stick around on Thursday with little to no weather impacts expected. Some lingering breezy conditions are still likely west of the Laramie Range on Thursday, but the rest of the forecast area will see a quiet day. Friday into the weekend, things could get interesting with a potential impactful winter storm. Of course, its still over a week away with plenty of time for models to come to a solution, but there is a chance for accumulating snow and windy conditions.

AVIATION /12Z TAFS THROUGH 12Z MONDAY/

Issued at 510 AM MST Sun Nov 15 2026

Upslope flow associated with a redeveloping storm system over Texas and Oklahoma will continue this morning across southeast Wyoming and western Nebraska. Low stratus clouds and fog will persist, especially over western Nebraska through this afternoon with slow clearing further west across the southeast Wyoming plains later this morning.

HAZARDS/WEATHER TRENDS: IFR to LIFR conditions will continue early this morning at KCYS, KSNY, and KAIA. KBFF and KCDR will be on the edge of these low clouds and will see periods of MVFR or near IFR CIGS. Otherwise, fog and low CIGS are forecast to lift between 12z and 16z for KCYS, and later this morning and this afternoon (16z to 20z) for KSNY and KAIA. VFR will continue for KRWL and KLAR over the next 24 hours with breezy conditions this afternoon. All terminals should return to VFR by 21z.

Another round of fog and low CIGS possible at KSNY and KAIA tonight after 06z.

CYS WATCHES/WARNINGS/ADVISORIES

WY...Dense Fog Advisory until 9 AM MST this morning for WYZ101-102- 107-108-118-119. NE...Dense Fog Advisory until 9 AM MST this morning for NEZ054-055.