Flash Flood Warning 41, NWS Salt Lake City, UT

Area Forecast Discussion
National Weather Service Salt Lake City UT
1034 PM MDT Tue Jul 21 2026

.KEY MESSAGES, Issued 1001 PM MDT Tue Jul 21 2026...

- The threat for severe weather, specifically gusty winds in
  excess of 58 mph, is waning across the region late this evening,
  though nocturnal convection may still produce gusty and erratic
  winds through early Wednesday morning.

- Scattered showers and thunderstorms are expected to develop
  across much of UT and southwest WY each afternoon within this
  forecast as monsoonal moisture lingers.

- The risk for flash flooding remains elevated through Wednesday,
  with much of UT outlined within a slight risk (2/4) of exceeding
  flash flood guidance.

&&

.DISCUSSION, Issued 1001 PM MDT Tue Jul 21 2026...
The threat for severe winds we've observed across
much of northern and eastern Utah this evening will wane through
the remainder of tonight as instability decreases across the area.
High-res models hint at the potential for some gusty, downsloping
outflow winds into the Uinta Basin into early Wednesday morning,
but are likely to stay sub-severe (<58 kts) given an increasingly
unfavorable environment as DCAPE decreases across the area.
Nocturnal showers with isolated thunderstorms will continue
overnight across much of the region through around mid-to-late
morning.

Widely scattered showers and thunderstorms are expected to develop
once again along the high terrain Wednesday afternoon, with a
potentially more efficient heavy rainfall threat across much of
the region, as supported by a Slight Risk (level 2/4) for
excessive rainfall from WPC across much of Utah and southwest
Wyoming. Weaker flow aloft will create favorable conditions for
storms to become anchored to terrain, which exacerbates the flash
flood risk for tomorrow. As usual, areas of highest concern
include normally dry washes, slot canyons, and recent burn scars.
Those planning to head outdoors in these areas tomorrow should
reconsider plans. Those living in a location vulnerable to flash
flooding should have multiple ways to receive warnings.

Thursday onward, we'll see a gradual downtrend in monsoonal
moisture areawide as an upper-level trough off the coast of the
PacNW introduces drier southwesterly flow across the region.
However, ample amounts of moisture will linger across the region
through the weekend, with PWATs in the 0.7-1.0" range. As we
remain under the influence of the broad ridging pattern into at
least the early weekend, daily chances for showers and
thunderstorms continue through this period, though with lower
flash flooding risk and better potential for potentially strong
to severe storms.

&&

.AVIATION...

KSLC...Monsoonal pattern continues. Outside of precipitation
influences, winds will favor a diurnally normal pattern. Gusty and
erratic outflow winds will be especially possible near
thunderstorms, with more modestly gusty conditions with showers.
There will be around a 20-30% chance of showers/thunderstorms
overnight. Thunderstorm chances then increase late morning through
Wednesday afternoon and evening. VFR conditions favored to persist,
but any heavier cell over the terminal may result in brief periods
of reduced CIGS/VIS.

REST OF UTAH AND SOUTHWEST WYOMING...An active weather pattern will
persist as monsoonal moisture remains. Isolated to scattered shower
and thunderstorms will persist across the area overnight. Area wide
thunderstorm activity then will begin to once again increase in
coverage late morning on through Wed evening. This activity will
bring periods of heavy rainfall, lightning, gusty and erratic
outflow winds, and potentially small hail. Outside of precipitation
and outflow influences, winds at area terminals will favor a
diurnally normal pattern and direction. VFR conditions are also
favored to generally prevail, but any stronger cell directly atop a
terminal will bring potential for periods of reduced CIGS/VIS.

&&

.FIRE WEATHER, Issued 116 PM MDT Tue Jul 21 2026...
Monsoonal moisture remains in place throughout UT
increasing humidities and chances for showers / thunderstorms across
the state, helping moderating fire weather conditions statewide.
Chances for showers and thunderstorms see a notable uptick across
the entirety of the state today as a stronger monsoonal push arrives
this afternoon. Expect showers and thunderstorms to develop along
higher terrain parallel to I-15 each afternoon over the next several
days around 1200-1400 with gusty outflow winds, heavy rainfall, and
lightning. Some storms this afternoon, particularly across northwest
UT and southeast UT may feature severe wind gusts in excess of
58mph. Winds will generally remain light terrain driven
/ diurnal over the next several days other than thunderstorm
influenced winds and gusts.
&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Flood Watch until 3 AM MDT Wednesday for UTZ113-115>131.

WY...None.
&&

PUBLIC...Whitlam
AVIATION...Warthen
FIRE WEATHER...Worster

For more information from NOAA's National Weather Service visit...
http://weather.gov/saltlakecity

Special Weather Statement
National Weather Service Salt Lake City UT
846 PM MDT Tue Jul 21 2026

UTZ104-105-108-110-220330-
Salt Lake Valley UT-Wasatch Back UT-Northern Wasatch Front UT-
Wasatch Mountains I-80 North UT-
846 PM MDT Tue Jul 21 2026

...A strong thunderstorm will impact portions of southwestern Weber,
northwestern Salt Lake, Davis and west central Morgan Counties
through 930 PM MDT
...

At 846 PM MDT, Doppler radar was tracking a strong thunderstorm over
Salt Lake City International Airport moving north at 20 mph.

HAZARD...Wind gusts of 50 to 55 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Salt Lake City, Ogden, Layton, Bountiful, Farmington, Hill Air Force
Base, Roy, Clearfield, Kaysville, Syracuse, Clinton, South Ogden,
North Salt Lake, Centerville, Woods Cross, Washington Terrace,
Riverdale, Hooper, South Weber, and West Bountiful.

This storm will be capable of producing strong gusty winds on the
Great Salt Lake. This will lead to a sudden increase in waves and
very choppy waters which will result in hazardous boating conditions.
Boaters are urged to seek safe harbor if possible.

This includes the following highways...
 Interstate 15 between mile markers 311 and 341.
 Interstate 84 between mile markers 82 and 93.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4082 11180 4077 11220 4116 11230 4123 11181
TIME...MOT...LOC 0246Z 190DEG 19KT 4079 11196

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

BW

Preliminary Local Storm Report
National Weather Service Salt Lake City UT
908 PM MDT Tue Jul 21 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0840 PM     Tstm Wnd Gst     Salt Lake City Weather  40.77N 111.95W
07/21/2026  M63 MPH          Salt Lake          UT   Public

            Measured wind gust of 63 mph I-215 at I-80
            mesonet sensor (UT215).

&&

STW

Preliminary Local Storm Report
National Weather Service Salt Lake City UT
910 PM MDT Tue Jul 21 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0854 PM     Tstm Wnd Gst     1 W Salt Lake City Weat 40.77N 111.97W
07/21/2026  M61 MPH          Salt Lake          UT   ASOS

            Measured gust of 61 mph at Salt Lake City
            International Airport ASOS (KSLC).

&&

STW

Special Weather Statement
National Weather Service Salt Lake City UT
927 PM MDT Tue Jul 21 2026

UTZ101-103-104-108-110-220415-
Wasatch Back UT-Eastern Box Elder County UT-
Northern Wasatch Front UT-Wasatch Mountains I-80 North UT-
Great Salt Lake Desert and Mountains UT-
927 PM MDT Tue Jul 21 2026

...A strong thunderstorm will impact portions of central Weber, east
central Box Elder, northeastern Davis and west central Morgan
Counties through 1015 PM MDT
...

At 926 PM MDT, Doppler radar was tracking a strong thunderstorm near
Layton, moving north at 50 mph.

HAZARD...Wind gusts of 50 to 55 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Ogden, Layton, Farmington, Brigham City, Hill Air Force Base, Roy,
Clearfield, Kaysville, Syracuse, Clinton, North Ogden, South Ogden,
Washington Terrace, Riverdale, Hooper, South Weber, Perry, Willard,
Marriott-Slaterville, and Uintah.

This storm will be capable of producing strong gusty winds on the
Great Salt Lake. This will lead to a sudden increase in waves and
very choppy waters which will result in hazardous boating conditions.
Boaters are urged to seek safe harbor if possible.

This includes the following highways...
 Interstate 15 between mile markers 324 and 361.
 Interstate 84 between mile markers 82 and 91.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4098 11182 4095 11225 4143 11245 4150 11190
TIME...MOT...LOC 0326Z 175DEG 43KT 4106 11201

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

BW

Special Weather Statement
National Weather Service Salt Lake City UT
1007 PM MDT Tue Jul 21 2026

UTZ101-103-104-107-108-110-220445-
Wasatch Back UT-Eastern Box Elder County UT-
Northern Wasatch Front UT-Wasatch Mountains I-80 North UT-
Cache Valley/Utah Portion UT-Great Salt Lake Desert and Mountains UT-
1007 PM MDT Tue Jul 21 2026

...A strong thunderstorm will impact portions of western Weber, west
central Cache, southeastern Box Elder, north central Davis and
northwestern Morgan Counties through 1045 PM MDT
...

At 1007 PM MDT, Doppler radar was tracking a strong thunderstorm over
Clinton, or over Hill Air Force Base, moving north at 15 mph.

HAZARD...Wind gusts of 50 to 55 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Ogden, Brigham City, Tremonton, Hill Air Force Base, Roy, Clinton,
North Ogden, South Ogden, Washington Terrace, Riverdale, Hooper,
South Weber, Perry, Wellsville, Willard, Marriott-Slaterville,
Uintah, Bear River City, Mantua, and Corinne.

This storm will be capable of producing strong gusty winds on the
Great Salt Lake. This will lead to a sudden increase in waves and
very choppy waters which will result in hazardous boating conditions.
Boaters are urged to seek safe harbor if possible.

This includes the following highways...
 Interstate 15 between mile markers 336 and 381.
 Interstate 84 between mile markers 39 and 90.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4114 11185 4110 11234 4169 11264 4175 11198
TIME...MOT...LOC 0407Z 176DEG 14KT 4114 11204

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

BW

Special Weather Statement
National Weather Service Salt Lake City UT
1204 AM MDT Wed Jul 22 2026

UTZ125>127-220645-
Upper Sevier River Valleys UT-Bryce Canyon Country UT-
Southern Mountains UT-
1204 AM MDT Wed Jul 22 2026

...A strong thunderstorm will impact portions of northwestern
Garfield, southern Piute and southeastern Beaver Counties through
1245 AM MDT
...

At 1204 AM MDT, Doppler radar was tracking a strong thunderstorm 9
miles southwest of Antimony, or 17 miles south of Junction, moving
west at 15 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Panguitch and Circleville.

This includes US Route 89 between mile markers 127 and 158.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3813 11201 3783 11198 3777 11247 3820 11245
TIME...MOT...LOC 0604Z 096DEG 15KT 3800 11210

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

BW