textproduct: Salt Lake City

KEY MESSAGES, Issued 1002 PM MDT Fri Jul 10 2026

- A significant widespread heatwave will develop this weekend into early next week, with temperatures challenging daily, monthly, and even all-time high temperature records.

- Monsoonal moisture will spread into the area during the early part of the upcoming week, remaining in place for much of next week. This will bring an elevated threat of flash flooding across southern Utah.

DISCUSSION, Issued 1002 PM MDT Fri Jul 10 2026

A strong ridge centered over southern California continues to make its way east this evening. Under the influence of this feature, skies are mostly clear with generally light winds. Maxes have trended upward, averaging 5-8F above seasonal normals.

The ridge will continue its eastward trek over the weekend as it continues to strengthen, bringing a significant heat wave to the area, peaking on Sunday. Just about all valley locations will see high temperatures at least at or above 100F for Saturday into Sunday, with maxes running up to 15F above normal, the greatest anomalies being found over northern Utah and southwest Wyoming. These temperatures will challenge many daily records, and in the case of northern portions of the area will challenge monthly and all time records as well. Logan continues to see a 75 percent chance in the latest model guidance of surpassing its all-time record high of 103F, and Evanston continues to have over a 60 percent chance to surpass its all time record of 95F. Farther south, the chances of breaking the all time record have gone down, with guidance now indicating a 10 percent chance of tying or breaking the all-time record of 107F in Salt Lake City.

Regardless, temperatures this hot will bring a significantly increased risk of heat-related illness to the general population in most valley and mountain valley locations through the weekend and in the case of the northern valleys, through Monday as well. To keep safe from the heat, those with outdoor activities planned should move them away from the hottest parts of the day if possible and stay hydrated. The best way, however, to prevent heat-related illnesses would be to stay inside in cooled areas if possible.

By Sunday, the center of the ridge is expected to move east of the area, putting Utah and southwest Wyoming under a southerly flow aloft. Confidence remains high that this flow will start advecting monsoonal moisture into the state from the south as early as Sunday night, with at least some convection developing over southern Utah by Monday afternoon and across much of the forecast area by Tuesday. By the middle of the week, it is looking increasingly likely that the flow aloft will become more light and variable in between weather features to the west and east. This will limit the increase of moisture over the area, but will also keep the existing anomalously high moisture in place. Thus, the threat of convection and thus flash flooding, particularly for southern Utah, is expected to continue for much of the upcoming week.

AVIATION

KSLC...VFR conditions will prevail through the TAF period. Southeasterly winds this morning will transition to northwesterly during the 18-19Z timeframe, before returning to southeasterly around 03Z this evening.

REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions will prevail through the TAF period. Winds will remain terrain driven at all terminals throughout the day.

FIRE WEATHER, Issued 513 AM MDT Sat Jul 11 2026

High pressure will build across the region through the weekend resulting in record challenging high temperatures, along with single digit RH and poor overnight recovery. This strong daytime heating will result in unstable conditions both this afternoon and again Sunday afternoon. With this high in place winds will remain largely terrain driven across the area. This high will move east early next week, allowing monsoon moisture to begin spreading into the region. Monday will remain hot and dry across the north, with increased RH and a chance for showers and thunderstorms across the south. As this moisture increases toward midweek, daily showers and thunderstorms along with elevated daytime RH and improved overnight recoveries can be expected.

SLC WATCHES/WARNINGS/ADVISORIES

UT...Extreme Heat Warning from noon today to 6 AM MDT Tuesday for UTZ101>108-114-116-118>121.

Extreme Heat Warning from noon today to 6 AM MDT Monday for UTZ115-122-128>131.

WY...Extreme Heat Warning from noon today to 9 PM MDT Monday for WYZ021.