textproduct: Cheyenne

KEY MESSAGES

- Elevated to critical fire weather conditions continue today due for Low RH and marginal winds.

- A Cool Airmass will descend over the Intermountain West for cooler temperatures Tuesday.

- Warming resumes Wednesday as a ridge builds back in, with similar temperatures next weekend as this past weekend.

SHORT TERM /THROUGH TUESDAY NIGHT/

Issued at 210 PM MDT Mon Aug 3 2026

An upper level low is traversing the Canadian Providences sending a weak trough and cold front through the Intermountain West. This cold front will drop the temperature a few degrees as it pushes through this afternoon and is expected to stall out in Northern Colorado this evening. Due to the summer sun the effect of the cold front won't really be felt until the overnight period as temperatures drop into the 40's and 50's. A cooler airmass will settle over the area tonight dropping 700mb temperatures to about 6/7C by Tuesday morning. This cooler airmass will slowly heat up leaving the high temperature for the Intermountain West in the 70's Tuesday and 70's and 80's Wednesday. The main upper level ridge will slowly rebound during this time as well advecting in those warmer temperatures and drier air into the region during this time as well. This cooler airmass also raises the afternoon RH values into the 20's and 30's with the exception of Carbon county which will still remain our driest region with RH values between 10 and 15 percent. This area of low RH values will expand eastward into Albany and Converse county as the warmer temperatures also slowly rise. Finally, the smoke thats currently overhead will slowly push eastward as the day progress and slowly clear out over the next couple days. An Air Quality Alert (AQA) was issued by the Wyoming Air Quality Division for the Southeast Wyoming area. Nebraska AQ division is holding off as the models have little to no smoke mixing down to the surface tomorrow.

LONG TERM /WEDNESDAY THROUGH MONDAY/

Issued at 210 PM MDT Mon Aug 3 2026

The long term will be largely uneventful as we see high pressure building back in, bringing warm and dry weather alongside a risk of critical fire weather conditions. Wednesday starts with some lingering precipitation in the Nebraska Panhandle as the trough is departing the region, but this will be quickly escaping and bringing in a dry spell that will last through the remainder of the long term. That being said, Wednesday should still be quite a fair late summer day, with temperatures in the 70's to 80's across our area thanks to the cold front that's currently passing over the region. But a high pressure ridge will build back in, dominating into the weekend with highs gradually rising back into the 90's to triple digits for most of our CWA outside of the mountains. Along with this will come dry air, with daytime relative humidity values into the single digit to teens each day. Because of this, expect an elevated fire weather environment, with the potential to become critical with any increase in winds. This could be notably possible over the weekend when the ridge flattens due to troughing to our north, causing an enhanced pressure gradient primarily for our northern zones bringing breezy winds. Otherwise, summer has no intention of leaving early as our streak of warm temperatures continues.

AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/

Issued at 540 PM MDT Mon Aug 3 2026

VFR conditions are expected through the TAF period as we remain under NNE flow behind the passage of a cold front this afternoon which has since stalled out just south of the Colorado border. There is quite a bit of smoke aloft, however visibilities are anticipated to remain well above MVFR criteria. CIGs may briefly lower to 5-10 kft around sunrise mainly for KCYS and the Nebraska terminals under moist, easterly upslope flow before the shallow moist layer mixes out by mid-morning and cloud heights rise. Peak gusts of 20-25 knots out of the NE should taper off overnight in the Nebraska Panhandle, before winds gradually veer to more ESE by tomorrow morning.

CYS WATCHES/WARNINGS/ADVISORIES

WY...Red Flag Warning until 9 PM MDT this evening for WYZ417-418- 420>423-425-427-430>433. Air Quality Alert until 11 AM MDT Tuesday for WYZ101>119. NE...Red Flag Warning until 9 PM MDT this evening for NEZ434>437.