textproduct: Salt Lake City

KEY MESSAGES, Issued 954 PM MDT Mon Aug 24 2026

- Showers and thunderstorms will become more restricted to the higher terrain and adjacent valleys Tuesday through Thursday.

- Temperatures will increase Wednesday into Thursday bringing an increased risk of heat related illness, particularly across the lower elevations of southern Utah.

- Another round of more widespread showers and thunderstorms is increasing in likelihood for Friday into early next weekend.

DISCUSSION, Issued 1242 PM MDT Mon Aug 24 2026

Utah and southwest Wyoming remain on the western periphery of a fairly stagnant ridge centered over NM/CO, with a bit of lingering mid-level moisture resulting in scattered showers and thunderstorms this afternoon. The main threats will be a mix of gusty outflow winds and moderate-heavy rainfall, thus an isolated flash flood threat still exists. Compared to yesterday, there is a bit less shear and instability, thus the severe thunderstorm wind threat is lower. Still, storms will be capable of producing outflow winds in excess of 50-60 mph, particularly across northern Utah and southwest Wyoming.

Tomorrow, as this mid-level moisture slowly decreases, shower activity will be lower, with a lower flash flood threat accordingly. Storms will largely form and remain over higher terrain through the week, though drier conditions on Thursday and maybe Friday could limit this potential.

Model guidance is trending towards some increase in moisture as early as Friday as southwesterly flow increases across the area. Deterministic guidance suggests a grazing shortwave trough potentially bringing a cold front as far south as northern Utah late this weekend, though ensemble guidance as a whole isn't as forward with the trough. If this does occur, this could increase the chances for severe thunderstorms, flash flooding, and/or fire weather concerns, depending on how exactly it plays out and how much moisture increases across the area.

AVIATION

KSLC...VFR conditions will persist for the KSLC terminal through the period. Variable winds associated with nearby showers will continue through 12Z before conditions dry and a light southerly flow returns. Isolated thunderstorms redevelop this afternoon, but there is <30% chance of impacts to the terminal. Winds will primarily be light and northerly during the afternoon.

REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions will persist for the entire airspace through the period. A few showers across the northern airspace continue to decrease in coverage. Isolated storms develop this afternoon with <30% chance of impacting most terminals. Winds will be light and diurnally driven aside from gusty and erratic winds near storms that develop.

FIRE WEATHER, Issued 426 AM MDT Tue Aug 25 2026

High pressure will remain fairly stationary across the Four Corners region through the weekend with isolated to scattered thunderstorms each afternoon and gradually weakening and decreasing overnight. Given some slightly drier air near the surface these storms have been producing strong gusty outflow winds that can travel long distances away from weakening storms.

Southwesterly winds start to increase towards the end of the week as a low pressure system moves into the PNW. This will also coincide with some lower relative humidity that could result in locally critical fire weather conditions. Moisture does remain draped across the area through the weekend and into early next week.

SLC WATCHES/WARNINGS/ADVISORIES

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