textproduct: Salt Lake City

KEY MESSAGES, Issued 102 PM MDT Sat Aug 8 2026

- Dangerous heat will persist across most of Utah today and across the north on Sunday. Those without access to cooling or proper hydration will be most at risk for heat-related illness. With temperatures remaining elevated overnight, there will be little recovery. Heat stress is cumulative.

- A marginal risk of excessive rainfall remains outlooked across southern Utah today, shifting north and east for Sunday and Monday. Periods of heavy rainfall will pose a flash flooding threat, particularly to rain sensitive basins.

- A monsoonal pattern looks to persist into the upcoming week, offering daily shower and thunderstorm chances, and potential for localized excessive rainfall.

DISCUSSION, Issued 102 PM MDT Sat Aug 8 2026

High pressure centered near the Four Corners region through the early part of next week will allow monsoonal moisture to continue to spread into the forecast area. The latest PWAT analysis shows around 1 inch across far southwest Utah, decreasing north and east to around 0.5 inches across far northeast Utah and southwest Wyoming. However, model trends show PWATs to gradually increase through the day, with west-central Utah seeing PWATs closer to 0.9 inches by 00z (though eastern Utah remains much drier at around 0.6-0.7 inches).

Isolated to scattered convection can be expected this afternoon and evening, mostly along/near the spine of Utah and across southwest through west-central Utah. Pockets of moderate rainfall were noted across southwest Utah the past couple of days, so can expect locally moderate to heavy rain to develop today across portions of southern Utah. Farther north, drier low levels will limit precipitation rates/amounts today and allowing for more of a wind threat across portions of central Utah.

Tomorrow, with PWATs closer to 0.9-1.0 inches reaching northern and portions of eastern Utah, more widespread and increasingly wet showers and thunderstorms can be expected. Diurnal scattered to numerous convection can then be expected through the coming week with moisture remaining in place. With this increase, the threat of heavy rain and flash flooding will increase. For today, there is a Marginal Risk of Excessive Rainfall in southwest Utah. This risk spreads north and east for tomorrow and Monday.

Temperatures today will remain quite hot, with many valleys seeing high temperatures near to above 100 degrees. However, the increase in moisture will aid cooler temperatures going forward. Many valleys are forecast to see highs only in the 80s for the latter part of next week. By Thursday, the NBM only has a 32% chance of SLC reaching 90 degrees, and that chance only decreases into next weekend.

AVIATION

KSLC...VFR conditions will persist through the period. Northerly winds will transition to a light southerly drainage wind between 02- 04Z.

REST OF UTAH AND SOUTHWEST WYOMING...Mostly VFR conditions will continue for the entire airspace through the period. Showers and thunderstorms across southwestern Utah will bring ceilings around 6000-8000 ft AGL, reduced visibility and gusty and erratic microburst winds up to 55 mph through around 02Z. Locally reduced visibility in smoke will occur near several large wildfires including near Richfield, near Cedar City, near Morgan, and between Ephraim and Huntington.

FIRE WEATHER, Issued 152 PM MDT Sat Aug 8 2026

With high pressure centered near the Four Corners area, monsoonal moisture will continue to increase over the area, spreading north and east tonight before lingering in place through the coming week. This will lead to diurnal showers and thunderstorms across the area. Showers and thunderstorms will become more widespread across the area tomorrow. Storms across southern Utah will continue to become increasingly wet tomorrow, while across the north, some storms near the northern/eastern edge of the moisture surge may initially begin on the drier side tomorrow. As humidities increase, wetting rain potential will increase areawide through the coming week. Gusty outflow winds in excess of 45 mph will remain possible with showers and thunderstorms through at least tomorrow. Outside of showers and thunderstorms, winds are expected to remain relatively light and terrain-driven.

SLC WATCHES/WARNINGS/ADVISORIES

UT...Extreme Heat Warning until midnight MDT Sunday night for UTZ101- 102-104-105-115-120-121.

Heat Advisory until midnight MDT Sunday night for UTZ103-106-107- 114-116.

Heat Advisory until 9 PM MDT this evening for UTZ118-119-122-126- 127.

Extreme Heat Warning until 9 PM MDT this evening for UTZ123-124- 128>131.

WY...None.