textproduct: Cheyenne

KEY MESSAGES

- A High Wind Warning is in effect for the usual southeast Wyoming wind prone area, Arlington and Bordeaux. Wind gusts of 55 to 65 MPH are possible.

- Drier and milder weather expected this weekend into early next week.

SHORT TERM /THROUGH SUNDAY NIGHT/

Issued at 237 AM MDT Sat Oct 17 2026

This weekend will be rather dry but seasonable. An upper level ridge begins to build over us suppressing any weather concerns this weekend. An area of high pressure will be setting up near the Northwest corner of Colorado increasing the pressure gradient over the mountains and higher elevations. There is a high wind warning out starting at 6am and will end at 7pm today for the wind prone areas near Arlington along I-80 and Bordeaux along I-25. Looking at the global omega fields, they still resemble a weak mountain wave like structure with downward omegas over the wind prones throughout the day. Westerly winds will aide in drying out the layer near the surface especially in the southern half of the forecast area. RH values will plummet into the teens during the late morning and afternoon, however the winds won't necessarily be there in the areas with critical fuels. Upward omegas will act as shield preserving the strong inversion that set up over the lower elevations east of I-25, likely leading to lighter winds that dont meet or exceed 25 MPH. Downward motion doesn't really set up over the lower elevations until 21z looking at model guidance by which the areas will already be starting to recover and may not be in critical territory anymore. So a Red Flag warning was not issued for our southern half of the forecast area. Looking at Mid-level water vapor a constant mix of water vapor and dry air will be advecting into the Intermountain West keeping RH values possibly out of Red Flag criteria especially since the winds won't be as strong Sunday. 700mb temperatures will be ranging from 6 to 11c which translates to surface temperatures in the 60's and low 70's this weekend giving us a nice fall like feeling with these clear skies. Overnight temperatures won't crash out like they did last night due to our westerly downsloping winds keeping the temperatures in the crisp 30's and 40's with the possibility of reaching 50 degrees in some areas.

LONG TERM /MONDAY THROUGH FRIDAY/

Issued at 325 PM MDT Fri Oct 16 2026

Mostly benign conditions to start the work week in the long term, but this pattern should begin to be broken up by a deep Pacific system that will encroach our region by the end of the forecast period. Monday starts with high pressure ridging mostly holding control of our forecast area, but a weakening upper level low will move across the Four Corners region and then just to our southeast through Tuesday afternoon. While mostly non- impactful, this feature will at least bring a very low end chance of some high elevation precipitation, along with a small bump in moisture. This influx of moisture will continue through the rest of the week as our upper level flow turns southwesterly while we sit between high pressure controlling the southeastern US and a deep Pacific system that will move inland by later Wednesday into Thursday. This feature will be the next noteworthy system to impact the forecast area as we see precipitation begin overspreading late Thursday into Friday and start another cooling trend that should persist into the weekend. For this forecast period, expect mostly similar temperatures day to day as highs will be around 6 to 12 degrees above normal, generally in the 60's to 70's, with lows similarly warm in the 40's. Any drop in temperatures would occur just beyond the long term after the Pacific system moves in, and the most impactful precipitation chances similarly just beyond this forecast time as well. Overall it should be a quiet period, but that will be ending by the weekend after next.

AVIATION /12Z TAFS THROUGH 12Z SUNDAY/

Issued at 533 AM MDT Sat Oct 17 2026

Max wind gusts around 30 knots are expected after 15z for KRWL but are expected to die down after 06z due to the tight pressure gradient from a surface high developing over Northwest Colorado. After 18z winds are expected to start gusting for KCYS and the Nebraska Terminals. Wind gusts over 20 knots aren't expected for these areas. Some low level wind shear may be present near KEAN and KTOR around 2,000 ft due to the high winds along I-25 south of KEAN. No other weather hazards are expected today with VFR conditions expected for the next 48 hours.

CYS WATCHES/WARNINGS/ADVISORIES

WY...High Wind Warning until 7 PM MDT this evening for WYZ106-110. NE...None.