textproduct: Salt Lake City

KEY MESSAGES

- 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

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, Issued 646 PM MDT Fri Jul 10 2026

KSLC...Light northerly winds prevail through the remainder of the daylight hours for the KSLC terminal alongside largely clear skies. Northerly winds will shift to a southerly drainage wind shortly after sunset, remaining in place through the late-morning on Saturday. VFR conditions prevail through the forecast period.

REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions are expected areawide through the valid TAF period. Isolated showers in far northeastern Utah and Uinta County, Wyoming will diminish by 02Z, with skies clearing in this area thereafter. Light diurnally driven flows are expected across all terminals this evening and overnight. Largely clear skies and light diurnally driven flows are expected areawide on Saturday.

FIRE WEATHER

High pressure currently over southern California will track east over the weekend as it strengthens. This will continue to bring a drying trend to an already critically dry state. However, under the influence of the ridge, the flow over Utah will be light, limiting the potential of critical fire weather conditions. Weekend temperatures will be quite anomalously hot, particularly for northern Utah where monthly and all-time high temperature records could be broken. Monsoonal moisture will start to make its way into the state from the south beginning Sunday night, with the moisture remaining in place for much of the upcoming week. This will bring higher relative humidity values and better overnight recovery along with less hot temperatures. This will also bring an increasing chance of wetting rains as well as flash flooding.

SLC WATCHES/WARNINGS/ADVISORIES

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

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

Red Flag Warning until midnight MDT tonight for UTZ495-496-498.

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