Severe Thunderstorm Warning 39, NWS Salt Lake City, UT

961 
WWUS55 KSLC 090503
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
1103 PM MDT Mon Sep 8 2025

UTC045-090545-
/O.CON.KSLC.SV.W.0039.000000T0000Z-250909T0545Z/
Tooele UT-
1103 PM MDT Mon Sep 8 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM MDT
FOR NORTH CENTRAL TOOELE COUNTY...

At 1103 PM MDT, a severe thunderstorm was located 7 miles northeast
of Clive, or 29 miles northwest of Grantsville, moving northeast at
15 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Delle.

This includes Interstate 80 in Utah between mile markers 54 and 71.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4100 11290 4100 11286 4083 11261 4067 11291
      4080 11310
TIME...MOT...LOC 0503Z 224DEG 14KT 4076 11298 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CRK

799 
WWUS55 KSLC 090516
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
1116 PM MDT Mon Sep 8 2025

UTC045-090545-
/O.CON.KSLC.SV.W.0039.000000T0000Z-250909T0545Z/
Tooele UT-
1116 PM MDT Mon Sep 8 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM MDT
FOR NORTH CENTRAL TOOELE COUNTY...

At 1116 PM MDT, a severe thunderstorm was located near Delle, or 22
miles northwest of Grantsville, moving northeast at 30 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Delle.

This includes Interstate 80 in Utah between mile markers 59 and 71.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4100 11290 4100 11286 4083 11261 4072 11282
      4083 11304
TIME...MOT...LOC 0516Z 216DEG 24KT 4082 11279 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CRK

199 
WWUS55 KSLC 090526
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
1126 PM MDT Mon Sep 8 2025

UTC045-090545-
/O.CON.KSLC.SV.W.0039.000000T0000Z-250909T0545Z/
Tooele UT-
1126 PM MDT Mon Sep 8 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM MDT
FOR NORTH CENTRAL TOOELE COUNTY...

At 1126 PM MDT, a severe thunderstorm was located near Delle, or 17
miles northwest of Grantsville, moving northeast at 15 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Delle.

This includes Interstate 80 in Utah between mile markers 65 and 71.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4072 11282 4077 11290 4092 11274 4083 11261
TIME...MOT...LOC 0526Z 221DEG 15KT 4078 11270 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CRK

158 
WWUS55 KSLC 090537
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
1137 PM MDT Mon Sep 8 2025

UTC045-090546-
/O.EXP.KSLC.SV.W.0039.000000T0000Z-250909T0545Z/
Tooele UT-
1137 PM MDT Mon Sep 8 2025

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL TOOELE COUNTY
WILL EXPIRE AT 1145 PM MDT...

A new severe thunderstorm warning has been issued for this storm and 
additional thunderstorms developing to the south and east through 
1215 AM.

LAT...LON 4072 11282 4077 11290 4092 11274 4083 11261
TIME...MOT...LOC 0536Z 224DEG 14KT 4079 11269 

$$

CRK

Area Forecast Discussion
National Weather Service Salt Lake City UT
358 PM MDT Mon Sep 8 2025

.SYNOPSIS...Southwest flow will build into the region through at
least Thursday ahead of an upper level disturbance. Chances of
accumulating precipitation increase Friday across northern and
central Utah, with temperatures falling around 5 to 10 degrees
below normal. Drier conditions will build into the area for next
weekend.

&&

.SHORT TERM (Through 12Z/6AM Wednesday)...Afternoon satellite
analysis shows a more interesting upper-level pattern than we've
experienced lately. A low pressure system is currently churning
just off the coast of CA/OR, with a ridge continuing to shift to
our east. Overhead, westerly flow is gradually becoming more
southwesterly through the column, with a broad area of upper-level
diffluence over the region. Showers and thunderstorms have
remained isolated at best so far this afternoon given modest
moisture despite some synoptic lift ahead of the aforementioned
low.

This evening, RAP analysis suggests a relatively small area of
enhanced PW moving from southwest to northeast, crossing the
Wasatch Front around or just after midnight. An area of showers
and gusty outflow winds may develop along this feature, though
high-res models are struggling with the exact placement; some CAMs
favor a placement through the Salt Lake Valley, others favor a
track further north near the UT-ID border, while others favor a
weak feature overall.

Tuesday appears to be a similar day to today, with isolated
convection developing during the afternoon, mainly across northern
Utah/southwest Wyoming. The main difference will be increasing
southwesterly winds during the afternoon, with surface wind gusts
approaching 30-35 mph across portions of western Utah, namely
western Millard and Iron counties...with gusts to 20-30 mph
elsewhere.

.LONG TERM (After 12Z/6AM Wednesday), Issued 314 AM MDT...With
the upper level trough now approaching the Reno area Wednesday,
drier air will work into the state, with 700mb winds increasing to
35kts or so. Humidities will once again fall to near 15% or below
across western Utah. This will bring another period of locally
critical fire weather conditions.

By Friday, ensemble systems represent a range of solutions that
largely support an upper level low shifting into the Great Basin
by Friday afternoon. One of the bigger questions is how quickly
dry air will work into Utah. Around 20% of the members are much
quicker to bring this dry air into Utah, thus reducing the threat
of widespread precipitation across northern and central Utah. The
remaining 80% of members suggest this drier air will hold off
sufficiently to allow for more widespread precipitation across
northern and central Utah as the upper level low ejects across the
region.

Given unstable conditions in the colder airmass behind this upper
level system, additional convection will be possible Saturday
afternoon, particularly across northern Utah. Temperatures will
average around 5-10 degrees below normal by Friday, closer to
around 5 degrees or so below normal over the weekend.

While a shortwave ridge will build into Utah once again next
weekend, the next upper level trough will already be approaching
the Pacific Coast.

&&

.AVIATION...KSLC...Northerly winds just now in place are expected to
hold into this evening prior to increased wind variability, this due
to an increasing trend of shower and/or thunderstorm potential
(namely after 02z). A 30% chance continues to exist for showers and
variable winds within the 02-07z timeframe, but now also seeing a
20% of a more developed thunderstorm between 02-05z. Post,
southeasterly winds will prevail later tonight through Tuesday with
speeds likely exceeding 26kts by Tuesday afternoon.

.REST OF UTAH AND SOUTHWEST WYOMING...In large VFR conditions will
dominate the airspace this valid TAF period, with southwest winds
trending to increase on Tuesday (western valleys >30kts pm hours.
Said, isolated showers and thunderstorms are expected in northern
Utah and southwest Wyoming during the first half of tonight, with
redevelopment over and downstream of mountain areas east of I-15
Tuesday. The primary impacts from any of these isolated storms will
primarily be from brief gusty/erratic winds and potential reductions
to MVFR as storms pass.

&&

.FIRE WEATHER...As a low pressure system slowly approaches and high
pressure shifts to our east, expect a subtle drying trend and increasing
southwesterly flow through Wednesday. With minimum RH in the mid-
teens and wind gusts of 30-35 mph on Tuesday afternoon and 30-40
mph on Wednesday afternoon across western valleys, pockets of
critical fire weather conditions are possible in areas with
sufficiently dry fuels. Overnight RH recoveries will be poor in
these areas, but marginal to good elsewhere. Although the air mass
is relatively dry, isolated to scattered showers will still be
possible across higher terrain each afternoon, particularly over
northern Utah.

As the low pressure system moves closer later in the week, winds
will weaken, chances for wetting rain will increase, and
temperatures will gradually fall. Precipitation chances are
expected to be highest on Friday, but there is some uncertainty
with how quickly drier air moves in and if there is locally
enhanced precipitation along a weak cold front.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...None.
WY...None.
&&

Cunningham/Kruse/Merrill

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

Special Weather Statement
National Weather Service Salt Lake City UT
1045 PM MDT Mon Sep 8 2025

UTZ101-090530-
Great Salt Lake Desert and Mountains UT-
1045 PM MDT Mon Sep 8 2025

...A strong thunderstorm will impact portions of southern Box Elder
and north central Tooele Counties through 1130 PM MDT
...

At 1045 PM MDT, Doppler radar was tracking a strong thunderstorm over
Clive, or 32 miles west of Grantsville, moving northeast at 15 mph.

HAZARD...Wind gusts up to 50 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Clive and Delle.

This includes Interstate 80 in Utah between mile markers 45 and 72.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4058 11305 4071 11322 4103 11293 4083 11260
TIME...MOT...LOC 0445Z 224DEG 14KT 4070 11307

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH

CRK