textproduct: Western and Central Wyoming

KEY MESSAGES

- High clouds continue to push through from the south and east with the upper level low over Colorado making its slow eastward progression overnight. Isolated (<10%) showers across Sweetwater County but rest of CWA will be dry with seasonable overnight low temperatures.

- Another weak shortwave pushes in from the Southwest with isolated showers (<10%) west of the Divide, mainly higher elevations Thursday afternoon. Overall, most will be dry with seasonable temperatures continuing.

- Overall dry conditions and light winds with seasonable temperatures continue through the rest of the week. Above average temperatures expected starting Sunday into the middle of next week.

UPDATE

Issued at 1139 AM MST Wed Nov 4 2026

A quick-moving low is traversing eastwards across Utah and Colorado today. Clouds associated with this system are seen on current satellite over the southern half of Wyoming, as high pressure to the north keeps moisture suppressed. Some very light returns are seen on radar from Afton to Rock Springs, with little to no impacts. This system is the extent of weather for the next 24 hours, as otherwise dry and seasonal conditions are in place.

DISCUSSION

Issued at 121 AM MST Wed Nov 4 2026

Conditions remain quiet this morning, as high clouds have moved over areas west of the Divide in the last several hours since Tuesday evening. These are due to a closed low pressure system that is moving over northern UT currently and will continue to track eastward through the day today. Isolated light rain showers will be possible along and south of a Afton-to-Rock Springs line this afternoon as this system moves over CO. Little to no impacts will occur due to a lack of instability and any possible measurable precipitation is likely to occur closer to the low center over southern Sweetwater County. Otherwise, conditions will be benign across the CWA with seasonal temperatures and light winds. These conditions will be in place again Thursday as an area of high pressure shifts over eastern MT/the western Dakotas. Above normal temperatures will return for much of Johnson County as a result.

A trough will move over the region on Friday, shifting the area of high pressure over the Dakotas and Upper Midwest. No significant impacts are expected with the passage of the trough, however the GFS is progging a low chance for rain over northern portions. A broad ridge will then build over much of the Intermountain West and extend over the Northern Rockies by Saturday keeping conditions dry. Temperatures then trend above normal across the CWA by Sunday and remain in place through the middle of next week as the ridge folds over. Conditions also look to stay dry through this period, with a weak trough possibly moving over the area on Tuesday.

AVIATION /00Z TAFS THROUGH 00Z FRIDAY/

Issued at 400 PM MST Wed Nov 4 2026

VFR conditions are expected through the period. Late-afternoon isolated showers will decrease after sunset. This activity is also associated with a broken cloud deck that will be seen at KRKS. Otherwise, mostly high scattered to clear skies are expected through Thursday morning. Clouds will begin to increase across western Wyoming after 18Z as a weak wave moves in. This will bring in light mountain snowfall, though terminal impacts are not expected at this time other than a broken lower VFR cloud deck at KJAC. Southwest winds will increase at KCPR after 15Z Thursday.

Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for the latest information on smoke, icing, and turbulence forecasts.

RIW WATCHES/WARNINGS/ADVISORIES

None.