textproduct: Cheyenne

KEY MESSAGES

- Cold Temperatures this morning with low temperatures in the single digits and lower teens. Some below zero readings are possible.

- Gradual warming trend today through Wednesday with periods of very windy conditions across the wind prone areas of southeast Wyoming. Remaining dry for most of the area outside the mountains through Thursday.

SHORT TERM /THROUGH TUESDAY NIGHT/

Issued at 240 AM MST Mon Dec 29 2025

Cold temperatures and mostly clear skies were observed early this morning with temperatures in the single digits and teens. Gusty west to northwest winds have kept temperatures a little higher near the mountains, but expect these winds to diminish further outside of the wind prone areas through sunrise. Wind chill temperatures haven't been too cold so far with a few areas across western Nebraska and the more sheltered valleys of southeast Wyoming showing wind chill readings slightly below zero. A few areas may see readings around -10 to -15, so not expecting to issue a Cold Weather Advisory at this time.

Slow warming trend begins today as an upper level ridge builds into the area from the eastern Pacific and 700mb temperatures climb above -5c. High will still be near or slightly below average day for the day with afternoon temperatures in the 30s to low 40s. Warming trend will continue into Tuesday as 700mb temperatures climb above -2c and afternoon highs return to the low 50s across most of the high plains.

Primary forecast concerns will be another round of locally strong winds for a few of the wind prone areas of southeast Wyoming...mainly the Arlington area and the I-80 Summit. Models backed off on high wind potential yesterday, but have now trended more aggressive, including in-house wind guidance. 700mb subsidence looks a lot more favorable as well with some mountain wave activity detected across Carbon and Albany counties...possibly extending eastward into Laramie County early Tuesday morning. Considering we are seeing gusts up to 52 MPH early this morning from subpar gradients and limited subsidence near Arlington...decided to issue a High Wind Watch for the Arlington zone and I-80 Summit/southern Laramie Range. Brief strong wind gusts are possible across the southern Laramie Range foothills and the Bordeaux area, but conditions aren't quite as favorable in those locations leading to lower than average confidence. With 700mb winds peaking to near 55 knots, decided to extend the High Wind Watch into early Tuesday afternoon due to possible boundary layer mixing and another wind max before winds diminish during the afternoon.

LONG TERM /WEDNESDAY THROUGH SUNDAY/

Issued at 325 PM MST Sun Dec 28 2025

Weather, what weather, not so much to talk about in the long term as ridging slides in and dominates conditions across the CWA for most of the upcoming work week. So, keep those sunglasses out as that globe in the sky will be ever so bright under mainly clear skies. Also, those shorts and flip-flopps might come in handy with highs soaring into the 40s and 50s, even the low 60s for a few locations across eastern Wyoming and the Nebraska Panhandle. Nighttime lows, as a whole, are expected to only dip into the 20s through extended. All this is due to upper level ridging that slides across the Intermountain West into our region by Wednesday, weakening a bit Thursday as energy moves in from the west. This upper level energy will increase cloudiness and chances of precipitation, with the greatest threat across our western forecast zones late Thursday through Friday morning. The bulk of the precipitation will not make it to or much past the I-25 corridor. Then, ridging makes a triumphant return once again late Friday into Saturday morning, ending any threat of precipitation. Finally, heading into next weekend, the potential for another system to impact our CWA, once again primarily west of the I-25 corridor, increases. In-house guidance have differing solutions of timing and placement of the precipitation, so there is plenty of time between now and then to fine tune the forecast. Winds, which have been hammering our known wind prone areas over the previous several weeks, will continue to be weaker and we get a reprieve from any major events for the duration of the long term period.

AVIATION /18Z TAFS THROUGH 18Z TUESDAY/

Issued at 1030 AM MST Mon Dec 29 2025

VFR conditions expected over the next 24 hours. Skies mostly clear, perhaps an occasional high cloud in the NE Panhandle. Winds generally 10-12 knots or less outside of an occasional gust but overall winds expected around or under 20 knots through the period.

CYS WATCHES/WARNINGS/ADVISORIES

WY...High Wind Watch from this evening through Tuesday afternoon for WYZ110-116. NE...None.