textproduct: Salt Lake City

KEY MESSAGES, Issued 1101 PM MDT Sat Aug 8 2026

- Dangerous heat will persist across portions of northern Utah and the low desert of southern Utah into Sunday.

- A marginal risk of excessive rainfall will continue across portions of Utah through the next five days.

- The threat of flash flooding will be most significant across slot canyons, normally dry washes, slick rock areas and recent burn scars.

DISCUSSION, Issued 1101 PM MDT Sat Aug 8 2026

High pressure over the Four-Corners region will continue to support a monsoon surge into Utah over the next 5-7 (or more) days. Evening analysis indicates that a potential MCV is developing over central Arizona. This may rotating around the ridge into Utah Sunday...potentially increasing the threat of flash flooding. This will be something to watch Sunday.

Looking at CAMS this evening, fairly widespread convection is forecast across much of the region. HREF suggest peak rainfall rates Sunday will be between 0.25 to 0.50 inches per hour, however, looking at ground truth today, stronger storms were capable of rates a bit higher than 0.50 inches per hour given slow storm motions.

Adjusted heat headlines based on latest trends. With lows struggling to fall below 80 degrees for the lower deserts of southern Utah, extended the Excessive Heat Warnings for lower Washington County, Zion National Park and Glen Canyon National Recreation Area. Even though highs will be slightly cooler Sunday, the lack of any meaningful relief overnight will continue to create cumulative heat stress...especially for those without adequate cooling and/or hydration.

With cooler temperatures forecast across central Utah, cancelled going heat products for these areas.

Expect convection to continue each afternoon and evening with an attendant flash flooding threat through at least the next 5 to 7 days.

AVIATION...KSLC

The SLC terminal will see VFR conditions through the day with some scattered clouds. Southerly winds are expected to shift to the northwest between 18Z and 20Z. There is a 30 percent chance that outflow from thunderstorms will bring periods of gusty and erratic winds to the terminal, primarily during the late afternoon and early evening.

REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions will prevail across the airspace throughout the day. Scattered showers and thunderstorms will develop this afternoon, primarily focused over the higher terrain. Any storms that develop could produce gusty and erratic winds and ceilings that could result in temporary mountain obscurations. 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 326 AM MDT Sun Aug 9 2026

High pressure centered over the Four Corners will allow monsoon moisture over southern and western Utah to spread north and east today across the remainder of the state. This will bring increasing coverage of showers and thunderstorms, primarily focused over the higher terrain, along with improved relative humidity values. Any storms that develop will have a chance of producing wetting rainfall, but will also bring lightning and periods of gusty and erratic winds. The ridge is expected to move little for much of the week, keeping the moisture in place and bringing a daily threat of showers and thunderstorms.

SLC WATCHES/WARNINGS/ADVISORIES

UT...Extreme Heat Warning until midnight MDT tonight for UTZ101-102- 104-105.

Heat Advisory until midnight MDT tonight for UTZ103-106-107-116.

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

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