textproduct: Salt Lake City

KEY MESSAGES, Issued 249 PM MDT Thu Aug 6 2026

- Dangerous heat will impact much of the state through Saturday across southern Utah, Sunday the remainder of the Utah. 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.

- Critical fire weather conditions will develop across southern Utah Saturday as widely scattered thunderstorms develop after a long duration period of very dry, very hot conditions. This will spread north and east across much of the remainder of southern Utah Sunday.

- A marginal risk of excessive rainfall has been outlooked across southern Utah Saturday, shifting north and east Sunday.

DISCUSSION, Issued 249 PM MDT Thu Aug 6 2026

High pressure will gradually shift east over the next several days...allowing for an influx of moisture around the west side of the ridge. While initially, thunderstorms may be somewhat high-based, a quick progression to heavy rainfall is expected Saturday. This may also bring an increased risk of flash flooding, with WPC outlooking portions of southern Utah in a marginal risk for excessive rainfall as early as Saturday, shifting to much of the state Sunday.

There isn't much indication this pattern will break down in the next 7-10 days. The strongest thunderstorms and heaviest rain will likely be tied to subtle shortwave troughs or MCVs embedded in the flow. Something that will need to be monitored moving forward.

Through Saturday across southern Utah and Sunday across the remainder of Utah, Extreme Heat Warnings and Heat Advisories remain in effect. No changes were made to these products with this package. A reminder, with low temperatures remaining elevated, there will be little recovery for those without adequate cooling or hydration. Heat stress is cumulative and the threat of heat- related illness will increase with time.

Fire Weather Watches may be needed for the increasing threat of convection by Saturday. See the fire weather discussion for more details.

AVIATION

KSLC...A slight increase in mid level moisture and clouds expected Friday as high pressure shifts, but precipitation chances remain minimal (less than 10%). Outside a similar chance of outflow gusts, winds expected to remain light (generally less than 10 kts) with direction shifts at typical diurnal times. VFR conditions anticipated to prevail, with potential for brief modest VIS reductions near sunset and sunrise due to sun angle combined with smoke.

REST OF UTAH AND SOUTHWEST WYOMING...High pressure will begin to start shifting southeast, allowing a slight increase in moisture. At northern terminals this will largely be midlevel, bringing an increase in cloud cover accordingly. Precipitation and outflow chances remain low (10% or less), with winds otherwise expected to follow a typical diurnal pattern. VFR conditions anticipated to prevail, with potential for brief periods of slight VIS reductions near sunrise and sunset due to smoke and sun angle. At southern terminals where a bit moisture is noted, more cloud cover will build in. Many southern terminals will see around a 10-30% chance of afternoon showers and thunderstorms, along with gusty erratic outflow wind gusts. Winds otherwise will favor a diurnally normal direction pattern.

FIRE WEATHER, Issued 249 PM MDT Thu Aug 6 2026

High pressure will gradually shift eastward, drawing mid-level moisture into Utah later Friday into Saturday. By Saturday afternoon, widely scattered thunderstorms will impact southwestern Utah. This will combine with a long duration of very hot, very dry conditions to bring the threat of critical fire weather conditions. As moisture draws further north and east, most of southern Utah will see a risk of widely scattered thunderstorms bringing the potential critical fire weather conditions to much of southern Utah Sunday.

By Monday, humidities will continue to increase, especially across the higher terrain. This monsoon surge will continue through at least midweek.

SLC WATCHES/WARNINGS/ADVISORIES

UT...Extreme Heat Warning from noon Friday to midnight MDT Sunday night for UTZ101-102-104-105-115-120-121.

Heat Advisory from noon Friday to midnight MDT Sunday night for UTZ103-106-107-114-116.

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

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

WY...Red Flag Warning until 9 PM MDT this evening for WYZ277.