Alert archive / Utah / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 26, NWS Salt Lake City, UT

July 22, 2021Salt Lake County, Utah County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 22, 2021, 7:07 PM MDT for Salt Lake County, Utah County, Utah. It was in force for 23 min. 6 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 22, 2021, 7:07 PM MDT (01:07 UTC)
Expired: Jul 22, 2021, 7:30 PM MDT
In force: 23 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Salt Lake County, UT, Utah County, UT

The radar

The Salt Lake City radar (KMTX), 86 km from the middle of the area, began a volume at 01:06 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Jul 22, 7:15 PM MDT	TSTM WND DMG	1 N Cottonwood Heights, UT	A LARGE TREE HAS UPROOTED AND CRASHED INTO A HOME, PLACING A HOLE IN THE ROOF. DAMAGE TO AN AWNING IS ALSO NOTED. TIME ESTIMATED FROM RADAR.
Jul 22, 7:15 PM MDT	TSTM WND DMG	1 N Taylorsville, UT	BROKEN TREE LIMBS CAUSED DAMAGE.
Jul 22, 7:15 PM MDT	HAIL 0.75	4 Sse Slc Intl Arpt, UT	REPORTED FROM ABC 4 STUDIOS.
Jul 22, 7:30 PM MDT	TSTM WND DMG	1 N Murray, UT	POWER LINES BROKEN. MULTIPLE LARGE TREES HAVE BEEN UPROOTED THROUGHOUT TOWN. REPORTS OF CARPORT AND CAR DAMAGE, DAMAGE TO BUSINESS SIGNS AND ROOFTOPS.
Jul 22, 7:30 PM MDT	TSTM WND DMG	Midvale, UT	MULTIPLE DOWNED TREES ON HOMES IN THE MIDVALE AREA, SNAPPED FULL SIZED TREES, POWER OUTAGES.
Jul 22, 7:30 PM MDT	TSTM WND GST 60	1 N Herriman, UT	60 MPH WIND GUST AT HOME SENSOR IN DAYBREAK, STORM DRAINS OVERWHELEMED BY HEAVY RAINFALL.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 00:00Z, 1.1 hours before the alert went out and 23 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 775 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 2884 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

280 
WUUS55 KSLC 230107
SVRSLC
UTC035-049-230130-
/O.NEW.KSLC.SV.W.0026.210723T0107Z-210723T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
707 PM MDT Thu Jul 22 2021

The National Weather Service in Salt Lake City has issued a

* Severe Thunderstorm Warning for...
  Southern Salt Lake County in northern Utah...
  North central Utah County in northern Utah...

* Until 730 PM MDT

* At 706 PM MDT, a severe thunderstorm was located over Midvale, or
  over Murray, moving east at 15 mph.

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

  SOURCE...Trained weather spotters have reported wind gusts to 60 
           mph.

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations impacted include...
  Salt Lake City, West Valley City, Sandy, Murray, West Jordan,
  Taylorsville, South Jordan, Draper, Riverton, Cottonwood Heights,
  Midvale, Holladay, South Salt Lake, Herriman, Alpine, Bluffdale,
  Little Cottonwood Canyon, Millcreek, Kearns and Magna.

This includes the following highways...
 Interstate 15 between mile markers 288 and 305.
 Interstate 80 in Utah between mile markers 123 and 130.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4050 11217 4074 11213 4072 11163 4045 11168
TIME...MOT...LOC 0106Z 278DEG 12KT 4062 11192 

HAIL...0.75IN
WIND...60MPH
 
$$

ND

2 follow-up statements

735 
WWUS55 KSLC 230118
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
718 PM MDT Thu Jul 22 2021

UTC035-049-230130-
/O.CON.KSLC.SV.W.0026.000000T0000Z-210723T0130Z/
Salt Lake UT-Utah UT-
718 PM MDT Thu Jul 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM MDT
FOR SOUTHERN SALT LAKE AND NORTH CENTRAL UTAH COUNTIES...

At 717 PM MDT, a severe thunderstorm was located over Midvale, or
over Murray, moving east at 15 mph.

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

SOURCE...Trained weather spotters. 

IMPACT...Expect damage to roofs, siding, and trees. 

Locations impacted include...
Salt Lake City, West Valley City, Sandy, Murray, West Jordan,
Taylorsville, South Jordan, Draper, Riverton, Cottonwood Heights,
Midvale, Holladay, South Salt Lake, Herriman, Alpine, Bluffdale,
Little Cottonwood Canyon, Millcreek, Kearns and Magna.

This includes the following highways...
 Interstate 15 between mile markers 288 and 305.
 Interstate 80 in Utah between mile markers 123 and 130.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4050 11217 4074 11213 4072 11163 4045 11168
TIME...MOT...LOC 0117Z 278DEG 12KT 4061 11187 

HAIL...0.75IN
WIND...60MPH
 
$$

ND

742 
WWUS55 KSLC 230128
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
728 PM MDT Thu Jul 22 2021

UTC035-049-230138-
/O.EXP.KSLC.SV.W.0026.000000T0000Z-210723T0130Z/
Salt Lake UT-Utah UT-
728 PM MDT Thu Jul 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN SALT LAKE AND NORTH
CENTRAL UTAH COUNTIES WILL EXPIRE AT 730 PM MDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

LAT...LON 4050 11217 4074 11213 4072 11163 4045 11168
TIME...MOT...LOC 0128Z 278DEG 12KT 4061 11183 

$$

ND

The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 22, 6:01 PM MDT	Special Weather Statement	SLC	Tooele	44 min
Jul 22, 6:47 PM MDT	Special Weather Statement	SLC	Utah	43 min
Jul 22, 6:53 PM MDT	Areal Flood Advisory	SLC	Salt Lake	112 min
Jul 22, 7:03 PM MDT	Special Weather Statement	SLC	Davis	42 min
Jul 22, 7:21 PM MDT	Severe Thunderstorm Warning	SLC	Davis, Morgan, Salt Lake, Summit	24 min
Jul 22, 7:23 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Utah	82 min
Jul 22, 7:30 PM MDT	Special Weather Statement	SLC	Salt Lake	30 min
Jul 22, 7:37 PM MDT	Areal Flood Advisory	SLC	Utah	105 min
Jul 22, 7:44 PM MDT	Special Weather Statement	SLC	Salt Lake	46 min
Jul 22, 7:52 PM MDT	Areal Flood Advisory	SLC	Salt Lake	86 min
Jul 22, 8:01 PM MDT	Special Weather Statement	SLC	Morgan	29 min
Jul 22, 8:11 PM MDT	Special Weather Statement	SLC	Davis	49 min
Jul 22, 8:29 PM MDT	Severe Thunderstorm Warning	SLC	Davis, Salt Lake, Tooele	31 min
Jul 22, 8:56 PM MDT	Special Weather Statement	SLC	Morgan, Salt Lake, Weber	49 min
Jul 23, 3:20 AM MDT	Flash Flood Watch	SLC	Beaver, Garfield, Iron, Kane, Piute, Washington and 1 more	21 hr
Jul 23, 2:34 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane	3 hr
Jul 23, 3:14 PM MDT	Special Weather Statement	SLC	Iron	46 min
Jul 23, 3:27 PM MDT	Special Weather Statement	SLC	Box Elder	33 min
Jul 23, 4:04 PM MDT	Special Weather Statement	SLC	Cache	26 min
Jul 23, 4:35 PM MDT	Special Weather Statement	SLC	Cache	25 min
Jul 23, 5:03 PM MDT	Special Weather Statement	SLC	Cache	27 min

Nearby

Severe Thunderstorm Warnings in Utah, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.