textproduct: Salt Lake City

KEY MESSAGES, Issued 1030 PM MDT Tue Aug 11 2026

- A marginal risk of excessive rainfall will continue across much of Utah through at least Friday. This risk expands further north on Thursday and Friday.

- Temperatures will decrease 10-15 degrees by the end of the week with slightly drier air pushing into the area by the weekend.

DISCUSSION, Issued 1030 PM MDT Tue Aug 11 2026

Widely scattered rain showers with isolated embedded thunderstorms will continue overnight, mainly across portions of northwest and southeast Utah where two decaying mesoscale convective systems are currently tracking through. Showers will continue to slowly move northeast across these areas into Wednesday morning.

Monsoon moisture remains in place across the region through Friday. A stronger influx of moisture is expected today as the ridge shifts eastward in response to a deepening trough along the west coast. PWATs are expected to rise to around 1.0-1.1" areawide Wednesday as a result, though nocturnal shower activity may hinder convective development Wednesday afternoon in some areas if conditions remain cloudy and stable. If storms are able to develop Wednesday afternoon, they will be capable of producing widely scattered showers and thunderstorms that bring an increased risk for flash flooding, especially across southern and central Utah.

The aforementioned trough brings more substantial cooling aloft Thursday and Friday as it continues to deepen across the West, resulting in increased instability across much of Utah and southwest Wyoming through this period. Increasing upper level flow will also produce more notable amounts of shear that will allow for more organized, widespread convection through this period. As such, the flash flood threat becomes more widespread across most of Utah and southwest Wyoming given deep monsoon moisture still in place. A welcome change arrives in the form of much cooler temperatures Thursday and Friday, given the increased cloud cover and cooling aloft from this system. Highs will run about 10-15 degrees cooler through this period.

A drier airmass works into the region under southwesterly flow this weekend. Very limited instability will also work to limit convective activity, with storms mainly remaining confined to the high terrain. The trough that brings drier southwest flow this weekend is expected to retrograde westward off the west coast early next week, with our typical monsoonal ridge redeveloping once again in its place.

AVIATION...KSLC

The SLC terminal will see VFR conditions throughout the day. Northwesterly winds are expected to return to the south by 14Z before shifting back to the south between 18Z and 20Z. There is a 20 percent chance winds stay northerly or light and variable during the morning. Scattered showers and thunderstorms will develop once again, with a 30 percent chance of storms impacting the terminal, primarily during the late afternoon and early evening.

REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions are expected across the airspace today with generally light and terrain driven winds from thunderstorms. Convective activity is expected to dissipate over the next couple of hours across northern Utah, with scattered showers and thunderstorms again developing across the area this afternoon, persisting into the evening. Any storms that develop will be capable of producing gusty and erratic winds, bringing a low chance of mountain obscurations and temporary MVFR conditions due to heavy rainfall.

FIRE WEATHER, Issued 431 AM MDT Wed Aug 12 2026

High pressure remains over the Four Corners region this morning, keeping monsoon moisture in place. This will bring another round of showers and thunderstorms during the afternoon into the early evening. There will be a low chance of wetting rain with any storms that develop, but also the threat of lightning as well as gusty and erratic thunderstorm winds. The ridge will move east starting tonight, allowing a storm system to move through Thursday into Friday. This system will bring noticeably cooler temperatures and an uptick in forcing, bringing more widespread coverage of showers and thunderstorms. Behind the storm system, the airmass will gradually becoming drier and warmer over the weekend, decreasing coverage of convection.

SLC WATCHES/WARNINGS/ADVISORIES

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