textproduct: Salt Lake City

KEY MESSAGES, Issued 117 PM MDT Sun Sep 20 2026

- An upper level low dropping into the Great Basin late Monday will spark widespread showers and thunderstorms persisting through early Wednesday.

- Moisture becomes confined to eastern/southeastern Utah for the remainder of the week.

DISCUSSION, Issued 117 PM MDT Sun Sep 20 2026

Dry and stable conditions remain across the region with temperatures running 5-7 degrees cooler than normal across northern Utah and near normal across southern Utah. Moisture starts to advect back into Utah and SW Wyoming tomorrow as an upper-level low swings into the Great Basin. This low will initiate convection across southern Utah late Monday with moisture spreading north and into northern Utah by Tuesday. PWATs approach the 90th percentile for this time of year, but storm motion will be fast enough to limit flooding impacts except for areas that experience any training storms. Steep lapse rates and 30-50 kts of shear will help storms mature and stay mature. Some isolated strong thunderstorms will be possible.

As the low tracks to the east conditions will become quieter across most of Utah, but moisture will remain elevated across southeastern Utah through much of the week. This late monsoon moisture tap will keep diurnal storm chances each day across areas of southeastern Utah.

AVIATION

KSLC...VFR conditions will persist at KSLC through the TAF period. Expect clear skies overnight with increasing mid-to-high level clouds throughout Monday. Winds remain generally light with typical diurnal shifts, with the next wind shift to southeasterly around 04z.

REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions are expected to persist across all terminals through the TAF period with diurnal wind shifts. Mid-to-high level clouds stream in from the southwest overnight into Monday. Isolated ain showers are possible after 22z for southwest Utah terminals, but impacts will be limited.

FIRE WEATHER, Issued 117 PM MDT Sun Sep 20 2026

Cool, dry, and stable conditions will continue areawide until Monday evening when showers and storms move into southern Utah thanks to an area of low pressure moving into the Great Basin. These storms will be moving from south to north, arriving in northern Utah on Tuesday. These storms will be fast moving, but rainfall rates will be high enough to quickly produce wetting rains. Some strong storms will be embedded within the complex which will be capable of strong and erratic winds, frequent lightning, and some hail. Conditions become mostly dry and stable by Wednesday, except for areas of eastern Utah that hold on to moisture, with near normal conditions persisting through the remainder of the week.

SLC WATCHES/WARNINGS/ADVISORIES

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