textproduct: Cheyenne

KEY MESSAGES

- Hot, dry, and breezy conditions continue through Monday.

- Monsoonal moisture will attempt to return be Tuesday, leading to increased precipitation chances through much of the week.

SHORT TERM /THROUGH MONDAY NIGHT/

Issued at 210 AM MDT Sun Jul 19 2026

With the upper-level ridge still firmly in place over Wyoming, hot conditions are expected to continue into the day Sunday. Partly to mostly sunny skies across a majority of the CWA will help temperatures climb about 5 to 10 degrees above normal for this time of year. Locations east of the Laramie Range will see high temperatures in the 90s to low 100s, hence the presence of a Heat Advisory. Some moisture will be present across the CWA as the monsoon strengthens over the Desert Southwest and pushes northward. A weak disturbance moving through the ridge will take advantage of the elevated moisture, leading to showers and thunderstorms developing during the afternoon hours. Hi-Res guidance shows storms initially forming over the high terrain before pushing east throughout the evening. Storms will dissipate by about midnight, with the rest of the night expected to be quiet.

Monday will be virtually the same as Sunday with hot temperatures continuing and another chance of showers and storms. Highs east of the Laramie Range on Sunday will be a few degrees warmer compared to Sunday, leading to a continuation of the the Heat Advisory through the afternoon. There will be a little less moisture around on Monday, however, Hi-Res guidance still shows the potential for a few isolated showers and storms during the afternoon hours. Given that less moisture is present, showers and storms will likely end around sunset.

LONG TERM /TUESDAY THROUGH SATURDAY/

Issued at 1240 PM MDT Sat Jul 18 2026

Tuesday...A decent pattern change ensues with the ridge flattening somewhat, helping monsoonal moisture to spread across our western counties, spawning scattered to numerous showers and scattered thunderstorms in the afternoon, primarily focused west of I-25.

Wednesday...Beneficial rains will become more in areal coverage with s decent increase in low level dewpoints and mid level monsoonal moisture and upslope mechanical southeast winds advecting low level moisture into our counties. Will see scattered to numerous afternoon and evening shower and thunderstorm coverage, most prevalent along the I-25 corridor where lift and orographic lift will be maximized corresponding to the deepest moisture supply.

Thursday...Somewhat drier air infiltrates our counties as the flow aloft turns westerly with some dry air intrusion at low and mid levels, as the surface trough or dryline moves to central Nebraska.

Friday...Ridging aloft becomes more pronounced, though with enough mid level moisture, will see typical isolated to scattered showers and some thunderstorms in the afternoon and evening, mainly west of I-25 and concentrated over the mountains.

Saturday...The ridge becomes less pronounced along with an increase in low and mid level moisture, and with more monsoonal moisture present, afternoon and evening shower and thunderstorm coverage will likely need to be increased as we approach day seven, providing more beneficial rains.

AVIATION /12Z TAFS THROUGH 12Z MONDAY/

Issued at 530 AM MDT Sun Jul 19 2026

Minimal aviation concerns are expected during the day with mostly sunny skies. VFR conditions will prevail with normal diurnal wind gusts of 20 to 25 kts possible during the afternoon hours. There is a chance of scattered showers and storms during the afternoon and evening hours. Storms could contain gusty winds.

CYS WATCHES/WARNINGS/ADVISORIES

WY...Heat Advisory from noon today to 6 PM MDT Monday for WYZ101- 102-108. NE...Heat Advisory until 6 PM MDT Monday for NEZ002-095. Heat Advisory from noon today to 6 PM MDT Monday for NEZ003- 019>021-096.