textproduct: Cheyenne

KEY MESSAGES

- Above average temperatures and dry conditions are expected to continue through Friday night.

- Chances of precipitation increase over the weekend for the mountains, but remain low for the plains.

- A more active pattern is expected into the middle of next week, with precipitation chances returning Wednesday into Thursday.

SHORT TERM /THROUGH SUNDAY/

Issued at 200 AM MST Fri Nov 13 2026

Forecast remains on track into this weekend, so not many changes made to the previous forecast package with relatively quiet weather lingering through Sunday. This morning, surface observations and current 10.3-3.9 fog product loop shows low clouds and fog starting to roll into western Nebraska at this hour with Alliance now down to 4 miles VIS with low stratus near 400 feet AGL. Fog product shows this area of low clouds/fog slowly drifting westward and will likely impact most of western Nebraska, in some form, through 800 AM Friday morning...and may event impact Torrington and the lower elevations of Goshen and possibly Platte County by sunrise. Increased the coverage of fog to for most areas near and east of the Wyoming/Nebraska border this morning. Fog should lift and clear out between 8 and 10 AM. Not expecting persistent dense fog at this time, so may handle any locally dense fog with a Special Wx Statement early this morning if visibilities lower any more than a half mile.

For the rest of today (Friday), the high amplitude upper level ridge axis will move overhead this morning along with increasing high cloudiness. Should be a pleasant afternoon with high temperatures remaining in the upper 50s to mid 60s across most of the area, coolest temperatures could actually be over the western Nebraska panhandle depending on how quick the low clouds dissipate. Mildest temperatures will likely be located along and just east of the I-25 corridor.

For this weekend, models remain in good agreement, showing the next Pacific storm system moving across the Great Basin Region Friday night and gradually into the central Front Range on Saturday. With a dominate southern branch of the upper level jet, expect this system to split and likely remain south of us into Saturday night with the northern portion weakening over Montana. Another round of fog and/or low clouds likely across most of western Nebraska and far eastern Wyoming Friday night and early Saturday due to increasing upslope southeast winds ahead of this storm system, so continued to increase coverage of fog across the eastern half of the forecast area. Some precipitation can't be ruled out for the I-80 corridor, but chances are pretty low with maybe a few inches of snow for the Sierra Madre and Snowy Ranges Saturday evening. Temperatures will begin to lower on Saturday with a cooler airmass working its way into the region. High temperatures in the upper 40s to mid 50s expected due to cloud cover and upslope south to southeast winds. The Pacific storm system will gradually weaken and eject eastward on Sunday, leading to a slightly warmer day with dry conditions and light west to southwest winds.

LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/

Issued at 1206 PM MST Thu Nov 12 2026

Monday...The flow aloft backs to southwest, inducing surface lee troughing across our forecast area, and producing a continued warming trend as 700 mb temperatures rise to near 6 Celsius. Continued dry with limited low and mid level moisture.

Tuesday...Looks like a breezy to windy day as the flow aloft strengthens in advance of an approaching shortwave trough aloft from Utah and Arizona. Low and mid level moisture still looks too scant for any precipitation to reach the ground.

Wednesday...A progressive negatively tilted shortwave trough aloft will move across our counties, spreading chances for showers from west to east, with somewhat drier conditions by late afternoon in the wake of the shortwave trough aloft.

Thursday...Fast southwest flow aloft develops again ahead of the closed low aloft across Idaho and Nevada. Looks like enough synoptic and mesoscale lift and adequate moisture to produce showers spreading from west to east, until the late afternoon when subsidence behind the shortwave trough aloft will make it drier. 700 mb temperatures suggest temperatures will be somewhat similar when compared to Wednesday.

AVIATION /18Z TAFS THROUGH 18Z SATURDAY/

Issued at 1047 AM MST Fri Nov 13 2026

Synoptically, a well pronounced ridge aloft will move slowly to the western High Plains today, extending from western North Dakota to the Texas Panhandle. Southerly flow aloft will strengthen tonight for our region as a high amplitude trough aloft slides across the Great Basin states.

This will continue the moist low level, southerly flow and winds across our aviation area, with another repeat of low clouds and fog expected late tonight and early Saturday morning along and east of the Laramie Range, and the Interstate 25 corridor. The fog will likely be more pronounced across the Nebraska Panhandle and the low lying locations, especially Alliance, Scottsbluff and Sidney.

Wyoming TAFS...Confidence is high in VFR through the period. Expect periods of scattered to broken high clouds near 15000 feet. The exception, or caveat, will be at Cheyenne, where you can expect MVFR ceilings and visibilities in low clouds and fog from 06Z to 16Z. Confidence in low clouds is high and moderate for visibilities restrictions at KCYS. Low clouds will end or erode at Cheyenne by 16Z. Decent surface pressure gradients and mix down winds will produce wind gusts to 30 knots at the terminals through early this evening.

Nebraska TAFS...Visible satellite imagery shows low clouds eroding quickly from just south of Chadron, to Alliance and to Lodgepole, in far eastern Cheyenne County, late this morning. High confidence in VFR prevailing this afternoon with scattered to broken clouds near 15000 feet. Widespread LIFR, with ceilings below 500 feet AGL and visibilities in fog below one mile, is expected at Alliance, Scottsbluff and Sidney from near 06Z to 15Z or 16Z. with MVFR ceilings and visibilities at Chadron from 10Z to 15Z. Visibilities in fog and ceilings will improve by late Saturday morning. Decent pressure gradients at the surface and mix down winds from aloft will produce wind gusts to 30 knots at the terminals through early this evening, with some locations staying gusty through the evening hours due to the brisk southerly low level flow.

CYS WATCHES/WARNINGS/ADVISORIES

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