textproduct: Salt Lake City

KEY MESSAGES

- Somewhat drier air will move into the area through the weekend, decreasing the threat of showers and thunderstorms. However, moisture is expected to increase again by Tuesday. - Hot temperatures as high as the lower 100s can be expected for the valleys of northwest Utah as well as the Uinta Basin through Monday, with highs in the upper 100s for portions of southern Utah, including Zion National Park. Overnight lows will remain in the 70s to around 80, limiting the potential for overnight relief from the heat.

DISCUSSION

Broad high pressure centered east of the Four Corners area along with a weak shortwave trough lifting across the PacNW has brought a drier southwesterly flow to Utah. This has reduced PWATs to around 0.9 inches in southern and central Utah, although a pocket of 1-1.2 inches exists across northwest Utah. Convection across southern Utah remained fairly isolated across southern Utah today as a result. Across northwest Utah, however, the moisture pocket and associated instability combined with increased shear owing to the proximity of the upper jet has allowed more scattered convection along with stronger storms today. These storms will continue to cross north-central Utah through late this evening before dissipating. An outflow boundary associated with these storms will continue to bring enhanced winds to portions of northern Utah until shortly after midnight.

The drier southwesterly flow will continue through Sunday and into early Monday. PWATs below 1 inch will spread into northern Utah Sunday. While this will bring a decreased threat of convection to northern Utah, a vort max rotating around the high is progged to lift across southeast Utah. This will aid in bringing increased convection to portions of southern and central Utah once again.

Despite the drying, enough moisture will be around to keep low temperatures elevated. In the valleys, this means that many valley locations will stay in the 70s to around 80 overnight with high temperatures rising above 100F, with the lack of relief contributing to an increased risk for heat related illness. As a result, heat highlights remain in place through Monday.

As the ridge amplifies, expect the flow aloft to turn more southerly, drawing moisture into the area once again late Monday or Tuesday. As such, a period of more active convection is expected to return, but this should be relatively brief. The high pressure will start to drift westward mid/late week, ending up near southwest UT/northwest AZ for the weekend. This will bring a drier airmass into the area, with the drying trend beginning as early as Thursday, and could potentially continue through at least the early part of next week.

AVIATION

KSLC...Outflows from thunderstorms moving through northern Utah will continue to bring enhanced northwesterly winds late this evening and delay the southerly wind shift until 06-07z. Generally light diurnal winds can be expected for Sunday. Expect VFR conditions throughout the TAF period.

REST OF UTAH AND SOUTHWEST WYOMING...Isolated showers and thunderstorms will continue to diminish after midnight tonight. Strong and gusty outflow winds will remain possible near these showers, with outflows across northern Utah impacting terminals across the northwestern third of Utah with gusty and erratic winds through 06-08z. VFR conditions will likely prevail, though a heavier shower could produce a temporary VIS reduction across far northern Utah through late tonight. For Sunday, scattered showers and thunderstorms will develop across southern and central Utah while northern Utah and southwest Wyoming will trend drier.

FIRE WEATHER, Issued 120 PM MDT Sat Jul 25 2026

Drier air will continue to move into Utah through Monday, causing a gradual decrease in coverage of showers and thunderstorms. On Sunday, these storms will likely be limited to southern and eastern Utah as a weak wave passes through. In general, storms this weekend will be capable of producing gusty and erratic outflow winds up to 45 mph, the exception being today across northwest Utah where gusts could exceed 60 mph through the early evening.

With this drier air moving in, portions of western and southern Utah are expected to see minimum relative humidity values near critical values both Sunday and Monday afternoons. While forecast confidence is still fairly low across northern and western Utah, moisture is likely to increase again across the rest of the state beginning Tuesday, with moisture remaining in place for much of the remainder of the upcoming week.

SLC WATCHES/WARNINGS/ADVISORIES

UT...Heat Advisory until midnight MDT Monday night for UTZ101>107-114- 124-128-130.

Extreme Heat Warning until midnight MDT Monday night for UTZ131.

WY...None.