textproduct: Salt Lake City

KEY MESSAGES, Issued 1056 PM MDT Sat Jul 25 2026

- Isolated to scattered convection can be expected across northern Utah on Monday with more isolated convection across southern Utah. Moisture will increase again by Tuesday, bringing an increased threat of flash flooding, before decreasing substantially from Thursday onward. - 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

High pressure remains centered over the OK/TX Panhandles and northeast NM this evening. Utah saw a slight influx of moisture today, with PWATs across southern Utah climbing to 1-1.2 inches while northern Utah remained under 1 inch. Aided by this increased moisture and a subtle vort lobe rotating around the high and lifting through Utah, increased shower and thunderstorm activity was noted today. While thunderstorms are waning with the loss of daytime heating, rain showers, generally light, will continue to spread into northern Utah tonight as the vort lobe continues to lift north, while they taper off across southern Utah. These showers will continue through the day on Monday across northern Utah, along with isolated thunderstorms in the afternoon. Southern Utah should see generally isolated showers and thunderstorms on Monday.

By Tuesday, the high pressure will shift closer to the Four Corners region, bringing a more southerly flow to southern Utah and Arizona, which should help spread more moisture into the area and allowing for increased convective coverage. However, this renewed moisture surge will be brief, as the high will continue to gradually shift westward through the week. Towards the end of the week, the high pressure will be centered too far west to favor the monsoon pattern, leading to drier conditions. This drying trend should begin on Thursday or Friday and will likely extend through at least the first half of next week. Cluster analysis of global ensembles are in good agreement on the general large-scale evolution.

Otherwise, hot temperatures will remain in place areawide through the week, with most valley areas seeing highs hovering near or above 100F. Conditions will be exacerbated tonight through Monday with cloud cover helping to maintain warm overnight lows. Increasing precipitation midweek is expected to cool the airmass enough to reduce HeatRisk to mostly Moderate in the valleys, but when the airmass dries out again late week with strong high pressure overhead, HeatRisk will increase again, with widespread areas of Major to Extreme HeatRisk noted.

AVIATION

KSLC...VFR conditions will persist for the KSLC terminal through the period. Mid level clouds with intermittent sprinkles/light rain will continue through the overnight period before drying out during the day. Convection will redevelop late tomorrow afternoon/early evening with ~30% chance of storms impacting the terminal. Mostly southerly winds overnight with intermittent gusty and variable as showers move by, and northerly winds establish during the afternoon.

REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions will persist for the entire airspace through the period. Mid level clouds will bring moisture up through the central and northern airspace overnight with only light rain showers expected along with some intermittent gusty and erratic winds. Conditions dry by morning with convection redeveloping across the central and northern airspace in the late afternoon. Background winds will remain light and diurnally driven.

FIRE WEATHER, Issued 1258 PM MDT Sun Jul 26 2026

With moisture remaining in place across the central and southern portions of Utah, expect daily shower and thunderstorm activity each day through at least Wednesday. For northern Utah, moisture content is already beginning to decrease, bringing low chances for showers and thunderstorms for areas roughly north of the I-80 corridor. Past Wednesday, the environment will dry substantially which will allow for a downtrend in relative humidity from Thursday through Saturday. For much of Utah, afternoon relative humidity will fall back into the single-digits to low-teens. In addition to to dry afternoon conditions, very little, if any, humidity recovery is anticipated in northwestern and west-central Utah starting Thursday night. A resurgence of heat is also expected through the latter half of the week.

SLC WATCHES/WARNINGS/ADVISORIES

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

Heat Advisory until 6 AM MDT Monday for UTZ116-118>120.

Extreme Heat Warning until midnight MDT Monday night for UTZ131.

WY...None.