textproduct: Cheyenne

KEY MESSAGES

- Dry conditions expected through Thursday alongside critical Fire Weather conditions. Cooler on Wednesday with temperatures warmer again on Thursday and Friday.

- Moisture and cooler temperatures return Friday through the weekend, with another shot of cooler air to start next week.

SHORT TERM /THROUGH FRIDAY NIGHT/

Issued at 200 AM MDT Wed Sep 9 2026

Next couple of days of the forecast look to be mostly benign aside from critical fire weather conditions under dry zonal flow aloft that will transition to a transient ridge on Thursday. With the cold front having passed through the region, look for temperatures near normal with highs in the 70's to low 80's, a nice respite from the continuous summer we've been experiencing. Meanwhile surface pressure gradients will promote breezy winds, mostly in the western sections of our CWA, and with daytime RH values descending into the teens to single digits, a Red Flag Warning has been issued for many of these zones. And with overnight recoveries very low, only peaking in the 20-30% range, this warning extends overnight into Thursday, where RH values should be even lower and more widespread (low single digits to low teens). Our winds may also be a bit more widespread as compared to today, so these products may need to be extended further tomorrow. With transient ridging over the area, look for temperatures to jump back up as well to coincide with the dry conditions, as highs reach back into the 80's to 90's, particularly east of the Laramie Range. Friday we'll see flow begin to turn back westerly to southwesterly with a pair of surface troughs moving across the region and a cold front knocking on our doorstep. This will begin to return moisture to the area, with a few showers and storms likely firing off of these boundaries during the late afternoon and into the evening. Favorable instability will remain just east of the CWA, and with conditions remaining mostly dry at the surface, most of this will likely be dry in nature producing virga and the attendant gusty showers or dry storms, supported by inverted V profiles. But this should be the the precursor to our weekend, when further moisture returns and we cool off yet again.

LONG TERM /SATURDAY THROUGH TUESDAY/

Issued at 200 AM MDT Wed Sep 9 2026

Moving into the weekend, a cold front will drop across the area on Saturday, lift back up as a warm front into Sunday, and then drop right back through by Monday. This will be in response to a deep low aloft moving over the PacNW and then across our area through early next week. With flow remaining southwesterly, monsoonal moisture will continue to increase with PWAT values 125-150% of normal, possibly even nearing 175% for portions of the Nebraska Panhandle Sunday into Monday. Better instability and shear will also support stronger storm activity and may signal the return of strong to severe storms. Into Monday moisture will begin to exit along with these systems, but we should experience the coolest day we've seen since the start of summer, with highs not expected to peak outside of the 60's to 70's, a sign of fall to come. But into Tuesday ridging will begin to rebound, this time across the southeastern US, with a slight warming trend to end the long term.

AVIATION /12Z TAFS THROUGH 12Z THURSDAY/

Issued at 502 AM MDT Wed Sep 9 2026

VFR conditions expected over the next 24 hours. Winds may be breezy this morning through the afternoon most sites at 15-25 knots, but will decrease again this evening and overnight, becoming 10 knots or less all sites. Skies may have an occasional mid to high level cloud, but otherwise expect SKC.

CYS WATCHES/WARNINGS/ADVISORIES

WY...Red Flag Warning from 11 AM this morning to 8 PM MDT Thursday for WYZ419>422-425-427. NE...None.