textproduct: Western and Central Wyoming
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
KEY MESSAGES
- Slightly cooler today, but still mild with highs in the upper 50s and lower 60s.
- A weak weather system to the south will bring increased clouds across southern Wyoming this evening, with a very low chance (5%) of a virga shower overnight.
- Another weak system moves across western Wyoming on Tuesday, with a slightly better chance (30-40%) of a shower during the afternoon.
DISCUSSION
Issued at 220 AM MDT Sun Oct 18 2026
Ridging begins to flatten today as the next coastal trough begins to dive southward along the West Coast. Light north to northeast winds behind yesterday's weak front and the decrease in the ridge will keep temperatures much closer to normal today, with highs mainly in the upper 50s to mid 60s. A weakening trough tucked in ahead of the larger west coast trough will move into western Colorado this afternoon, spreading a few more clouds into southern WY. There may be just enough moisture to spark a shower or two, but surface humidity remains particularly dry still, so likely will only see a few virga showers this evening across Sweetwater County.
Monday will see an increase in moisture, but with little to no upper level support, not expecting anything more than a few clouds across SW WY during the afternoon.
Tuesday with the trough stalling off the California Coast, southwest flow aloft will continue to bring some more Pacific moisture into western WY. There may be enough diffluence aloft for a few showers for the western mountain ranges during the afternoon, but wringing any moisture out of these will be a hard task.
The coastal trough finally ejects northeast into the Rockies by Thursday. Still varying differences in model solutions regarding where it finally goes, but in any case, there will be some precipitation Thursday into Friday, mainly for areas west of the Divide.
AVIATION /12Z TAFS THROUGH 12Z MONDAY/
Issued at 522 AM MDT Sun Oct 18 2026
VFR conditions continue through the next 24 hours, with only high cirrus varying through the day. Winds will be light for all locations except KCPR, where a few gusts 15 to 20kts are expected through the day.
RIW WATCHES/WARNINGS/ADVISORIES
None.
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