textproduct: Salt Lake City

KEY MESSAGES, Issued 1024 PM MDT Sat Jul 11 2026

- The heat wave over the area will peak on Sunday, with many daily, monthly, and all-time records being challenged, particularly over northern portions of the area.

- Temperatures will gradually become less hot during the upcoming week as monsoonal moisture moves into the area. This will increase the threat of precipitation and thus flash flooding, particularly over southern Utah, for much of next week.

DISCUSSION, Issued 1024 PM MDT Sat Jul 11 2026

A strong ridge parked over Utah and southwest Wyoming is bringing dry and very hot conditions. Maxes averaged up to 10F above seasonal normals, which means most valleys got close to or exceeded 100F for their high temperature today. Though the ridge will shift east tomorrow, some additional hot air will continue to advect in, with guidance indicating 700 mb temps in the +20 to +22C range during the afternoon, among the highest 700mb temperatures that have been observed over the area. Predictably, this will likely lead to many daily records being broken, particularly over northern portions of the area where the airmass is most abnormally warm. Locations like Logan and Evanston have a 60-75 percent chance of exceeding their all-time record high temperatures. There is a lower chance of this happening in farther south locations like Salt Lake City and Park City, more like a 10-30 percent chance. Still, temperatures this high will bring an increased threat of heat related illness to most valley and mountain valley locations across the area, and Extreme Heat Warnings remain in effect.

For Monday, the Extreme Heat Warnings will continue for northern portions of the area. Monsoonal moisture will start to advect northward Sunday evening, and this increase in moisture will impact temperature more significantly over southern Utah. Though northern Utah will be a bit less hot, the heightened threat of heat related illness remains. The return of moisture will also bring increasing coverage of showers and thunderstorms through the first part of the week. This is mostly good news for the wildfire situation across the state, but will bring an increased threat of flash flooding, particularly to southern Utah. Though the flow will most likely become light for the middle and latter part of the week, limiting the advection of additional moisture, the deep moisture already over the area will remain in place, with high confidence it will stay in place for the remainder of the upcoming week.

AVIATION

KSLC...VFR conditions prevail through the TAF period. Southerly winds will persist into the early afternoon before transitioning to northwesterly during the 20-21Z timeframe. There is a 20% chance this wind shift occurs as early as 19Z.

REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions will prevail through the TAF period areawide with south to southwesterly winds developing by late morning. Across southern terminals, there is a 10- 12% chance of a shower or thunderstorm impacting KCDC after 22Z. By this evening outflow from showers and thunderstorms over Arizona will produce periods of gusty winds at KSGU and KCDC, most likely during the 02-05Z timeframe.

FIRE WEATHER, Issued 506 AM MDT Sun Jul 12 2026

High pressure centered across the region will maintain a very hot and very dry airmass today, with afternoon temperatures challenging all-time records across northern and central Utah. Poor to non-existent overnight recovery will allow RH values to fall near or below 10 percent by midday. The exception will be southwest Utah where some hints of monsoon moisture will keep RH values near 15 percent. The combination of very hot and very dry conditions will result in deep mixing and an unstable airmass this afternoon.

Monsoon moisture will finally begin to spread into the area Monday, bringing an increase in daytime RH across southern and perhaps central Utah along with a chance of showers and thunderstorms. Although temperatures will cool slightly across northern Utah Monday, the airmass will remain hot, dry and unstable. This moisture will spread northward through midweek, bringing an increased chance of showers and thunderstorms capable of wetting rains across the state by Tuesday, along with elevated daytime RH and improved overnight recovery.

SLC WATCHES/WARNINGS/ADVISORIES

UT...Extreme Heat Warning until 6 AM MDT Tuesday for UTZ101>108-114- 116-118>121.

Extreme Heat Warning until 6 AM MDT Monday for UTZ115-122- 128>131.

WY...Extreme Heat Warning until 9 PM MDT Monday for WYZ021.