Alert archive / Utah / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 37, NWS Salt Lake City, UT

July 26, 2021Washington County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 26, 2021, 1:37 PM MDT for Washington County, Utah. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 26, 2021, 1:37 PM MDT (19:37 UTC)
Expired: Jul 26, 2021, 2:00 PM MDT
In force: 23 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Washington County, UT

The radar

The Cedar City radar (KICX), 51 km from the middle of the area, began a volume at 19:41 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.

The nearest sounding before it

Las Vegas, NV (KVEF), launched 12:00Z, 7.6 hours before the alert went out and 233 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: 467 J/kg
Mixed-layer CIN: -144 J/kg
Mixed-layer LCL: 1095 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -37 m²/s²
0-3 km storm-relative helicity: 35 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

770 
WUUS55 KSLC 261937
SVRSLC
UTC053-262000-
/O.NEW.KSLC.SV.W.0037.210726T1937Z-210726T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
137 PM MDT Mon Jul 26 2021

The National Weather Service in Salt Lake City has issued a

* Severe Thunderstorm Warning for...
  Southeastern Washington County in southwestern Utah...

* Until 200 PM MDT

* At 136 PM MDT, a severe thunderstorm was located near Apple Valley,
  or 9 miles southwest of Zion National Park, moving west at 10 mph.

  HAZARD...60 mph wind gusts and half dollar size hail. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Zion National Park, Hurricane, La Verkin, Apple Valley,
  Toquerville, Virgin, Springdale and Rockville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3719 11300 3710 11303 3711 11330 3730 11325
TIME...MOT...LOC 1936Z 106DEG 9KT 3717 11310 

HAIL...1.25IN
WIND...60MPH
 
$$

Webber

2 follow-up statements

195 
WWUS55 KSLC 261951
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
151 PM MDT Mon Jul 26 2021

UTC053-262000-
/O.CON.KSLC.SV.W.0037.000000T0000Z-210726T2000Z/
Washington UT-
151 PM MDT Mon Jul 26 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM MDT
FOR SOUTHEASTERN WASHINGTON COUNTY...

At 150 PM MDT, a severe thunderstorm was located near Apple Valley,
or 11 miles southwest of Zion National Park, moving west at 10 mph.

HAZARD...60 mph wind gusts and half dollar size hail. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Zion National Park, Hurricane, La Verkin, Apple Valley, Toquerville,
Virgin, Springdale and Rockville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3719 11302 3712 11303 3711 11330 3730 11325
TIME...MOT...LOC 1950Z 106DEG 9KT 3718 11314 

HAIL...1.25IN
WIND...60MPH
 
$$

Webber

757 
WWUS55 KSLC 262001
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
201 PM MDT Mon Jul 26 2021

UTC053-262010-
/O.EXP.KSLC.SV.W.0037.000000T0000Z-210726T2000Z/
Washington UT-
201 PM MDT Mon Jul 26 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WASHINGTON COUNTY
HAS EXPIRED...
                
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 has been allowed to expire.  However gusty 
winds are still possible with this thunderstorm. A significant 
weather advisory has been issued for this same storm and is valid 
through 245 PM.

LAT...LON 3719 11302 3712 11303 3711 11330 3730 11325
TIME...MOT...LOC 2000Z 106DEG 9KT 3719 11317 

$$

Webber

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 6:06 PM MDT	Special Weather Statement	SLC	Washington	39 min
Jul 25, 6:16 PM MDT	Special Weather Statement	SLC	Washington	44 min
Jul 26, 3:37 AM MDT	Flash Flood Watch	SLC	Beaver, Garfield, Iron, Kane, Piute, Washington and 1 more	20 hr
Jul 26, 1:13 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane, Washington	3 hr
Jul 26, 1:40 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield	3 hr
Jul 26, 1:47 PM MDT	Special Weather Statement	SLC	Piute	43 min
Jul 26, 2:00 PM MDT	Special Weather Statement	SLC	Washington	45 min
Jul 26, 2:07 PM MDT	Areal Flood Advisory	SLC	Washington	53 min
Jul 26, 2:12 PM MDT	Areal Flood Advisory	SLC	Iron	2 hr
Jul 26, 2:35 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron	115 min
Jul 26, 2:45 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield	4 hr
Jul 26, 2:53 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron, Washington	3 hr
Jul 26, 3:01 PM MDT	Severe Thunderstorm Warning	SLC	Beaver, Iron	29 min
Jul 26, 3:07 PM MDT	Severe Thunderstorm Warning	SLC	Beaver, Iron	23 min
Jul 26, 3:20 PM MDT	Severe Thunderstorm Warning	SLC	Beaver, Iron	2 min
Jul 26, 3:26 PM MDT	Special Weather Statement	SLC	Washington	49 min
Jul 26, 3:30 PM MDT	Severe Thunderstorm Warning	SLC	Washington	30 min
Jul 26, 3:32 PM MDT	Areal Flood Advisory	SLC	Washington	118 min
Jul 26, 3:32 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Beaver	3 hr
Jul 26, 4:00 PM MDT	Severe Thunderstorm Warning	SLC	Washington	30 min
Jul 26, 4:34 PM MDT	Special Weather Statement	SLC	Washington	41 min
Jul 26, 4:55 PM MDT	Special Weather Statement	SLC	Beaver	50 min
Jul 26, 5:30 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane	6 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.