textproduct: Western and Central Wyoming

KEY MESSAGES

- Gusty winds continue this afternoon up to 40-50 mph through the wind corridor ahead of a frontal boundary from South Pass to Casper. Gusty winds over 50 mph possible for Casper Mountain and right behind the front through Johnson County as well.

- Above average temperatures continue this afternoon and for much of the work week (5 to 15 degrees).

- Precipitation chances skirt across northern parts of the state (30-40%) Monday night into Tuesday.

- Mainly dry for most but next chance for a more widespread system will come by week's end and into next weekend.

UPDATE

Issued at 1200 PM MST Sun Nov 2 2025

Midday WV imagery shows the broadening upper level trough and associated finger of the PFJ pushing across northern parts of the CWA and into Montana. As such, IR shows increasing mid to upper level cloud cover for these areas with some isolated shower activity across the northern Bighorn Basin. This will subside further behind the frontal boundary now making its way further south into the Basin and into Natrona County. However, the tricky part will be when and where it stalls and retreats northeastward overnight into Monday. Winds have increased ahead of the frontal push seeing gusts up to 40 to 50 mph from South Pass to Casper, and even some isolated gusts over 50 to 55 mph as well to include post-frontal around the Buffalo and Powell areas.

Otherwise, expect winds to diminish as the afternoon progresses and especially towards sunset and overnight. Breezy winds but not near as strong Monday and Tuesday with the next subtle shortwave that will skirt across northern parts of the CWA once again. Most of the energy will be in Montana more along and north of the main finger of the PFJ. Behind this Tuesday, ridging continues with above average temperatures for much of this next work week. The next bigger system is expected to push through by week's end but much uncertainty on how this unfolds at this point in time. Stay tuned for updated forecasts in the coming days.

DISCUSSION

Issued at 1241 AM MDT Sun Nov 2 2025

Wind is the main forecast element today. Gusty winds 30 to 55 mph are ongoing across the Absaroka and eastern Wind River Ranges, with some isolated gusts above 50 mph in the Absarokas, around the Clark area. These winds continue into Sunday morning, but should decrease some after sunrise from north to south. Gusts 20 to 40 mph then occur through the rest of the day, finally coming to an end Sunday night.

The other windy location is the Wind Corridor from around South Pass to Casper. Generally wind gusts are 30 to 40 mph, though wind prone locations (like Red Canyon of South Pass and Outer Drive in Casper) are seeing stronger winds to around 50 or 55 mph. These winds continue longer than over the mountains, through mid-afternoon. The gusty winds end Sunday night. Elsewhere, gusty winds will occur today, with many lower elevations seeing gusts 15 to 30 mph this morning and afternoon.

A little moisture, aided by some shortwave energy, could bring a few light snow/rain showers over northwest Wyoming (and the Bighorn Mountains) today, primarily between 9am and 11pm MST, though some could linger in the Yellowstone area a few hours longer.

Monday brings increasing gusty winds again, though will be less than today. Dry air will also limit any chances for precipitation. Another embedded shortwave moves through for Tuesday, continuing the breezy conditions and bringing rain/snow chances (20%-45%) across northwest Wyoming. This system is quick and relatively unimpactful. Wednesday is a transition day as a quick moving ridge passes over, keeping the mild temperatures over the area. A more potent system arrives as early as late Wednesday, though could slow down more into Thursday. This system looks to mainly bring snow to the western mountains Thursday and Friday, though also brings low rain chances across the area for Friday.

AVIATION /00Z TAFS THROUGH 00Z TUESDAY/

Issued at 357 PM MST Sun Nov 2 2025

The surface cold front moving south through areas east of the Continental Divide has swept through KCPR and is nearing KRIW late Sunday afternoon. A period of northerly wind 12-22kts occurs in the wake of the cold front into early Sunday evening before slowing by 03Z/Monday. Earlier mid-cloud deck across northwest Wyoming has been slowly fading, leaving a clearing VFR sky overnight for all terminals except KBPI. Hi-res ensembles continue to favor IFR/MVFR fog (50 percent or more) at KBPI late tonight and early Monday morning (10Z-16Z/Monday). The best chance for fog at KBPI arises between 12Z-15Z/Monday, and may bleed northeast toward KPNA. Occasional mountain top obscurations until 03Z/Monday, then localized foothill obscurations in the vicinity of KBPI and KPNA 10Z-17Z/Monday. Surface wind is less Monday, with KCPR and KJAC the most likely terminals to see 12-22kt southwest wind in the afternoon.

Please see the Aviation Weather Center and/or CWSU ZLC and ZDV for the latest information on smoke, icing, and turbulence forecasts.

RIW WATCHES/WARNINGS/ADVISORIES

None.