textproduct: Salt Lake City

KEY MESSAGES, Issued 1056 PM MDT Tue Sep 29 2026

- Wrap-around rain showers continue across far southeast Utah tonight before moving out of the region Wednesday morning.

- High pressure develops across the western US through the latter half of the week, resulting in a gradual warming trend through the weekend.

- While chances remain low at this time (~20% or less), there is potential for moisture to return to southern Utah early next week.

DISCUSSION, Issued 1056 PM MDT Tue Sep 29 2026

An upper-level low continues to progress eastward across Arizona this evening, eventually phasing with Hurricane Polo overnight into Wednesday morning. As these system phase together, a deformation axis develops across the Four Corners region, combining with wrap-around moisture to result in an invigoration in rain showers across this area. High resolution guidance indicates most of the activity will be focused along and southeast of Glen Canyon. A general lack of instability will likely keep rainfall in this area more stratiform in nature, though isolated embedded heavier cores are possible especially in areas near the Arizona border early Wednesday morning.

Northwesterly flow developing on the heels of the exiting system ushers in a much drier airmass across Utah and southwest Wyoming on Wednesday. A high pressure ridge is expected to strengthen across the western US through the remainder of the week, resulting in limited precipitation chances and a gradual warming trend through the weekend and into early next week. Highs are expected to peak on Monday around 10 degrees above seasonal averages.

A bit more uncertainty in the forecast exists early next week, with around 20% of ensemble members suggesting the potential for a shortwave digging into the region to bring increased moisture across southern Utah that could bring more active weather. The Eastern Pacific remains very active with several tropical disturbances and systems already in place; the eventual progression of these systems will heavily impact how our forecast evolves over the next week.

AVIATION

KSLC...Light northwesterly winds will increase through the day before switching back to the south around 03-05Z.

REST OF UTAH AND SOUTHWEST WYOMING...Rain showers will impact terminals across southeastern Utah, roughly south and east of a line from KNB to HVE. Occasional MVFR conditions will occur in these rain showers through the day.

FIRE WEATHER

As the upper level low and associated tropical moisture pull away from the region, expect a drying and warming trend to continue through the weekend. The next chance for any precipitation looks to be Monday into Tuesday next week.

SLC WATCHES/WARNINGS/ADVISORIES

UT...None. WY...None.