Alert archive / Utah / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 32, NWS Salt Lake City, UT

July 24, 2021Washington County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 24, 2021, 4:04 PM MDT for Washington County, Utah. It was in force for 26 min. 1 report 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 24, 2021, 4:04 PM MDT (22:04 UTC)
Expired: Jul 24, 2021, 4:30 PM MDT
In force: 26 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

County Washington County, UT

The radar

The Cedar City radar (KICX), 79 km from the middle of the area, began a volume at 22:08 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 24, 4:06 PM MDT	HAIL 1	6 Ne Gunlock, UT	HAIL FELL AT THE VEYO POOL RESORT. TIME ESTIMATED BY RADAR.

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

The nearest sounding before it

Las Vegas, NV (KVEF), launched 12:00Z, 10.1 hours before the alert went out and 195 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: 335 J/kg
Mixed-layer CIN: -191 J/kg
Mixed-layer LCL: 2063 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 121 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

420 
WUUS55 KSLC 242204
SVRSLC
UTC053-242230-
/O.NEW.KSLC.SV.W.0032.210724T2204Z-210724T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
404 PM MDT Sat Jul 24 2021

The National Weather Service in Salt Lake City has issued a

* Severe Thunderstorm Warning for...
  West central Washington County in southwestern Utah...

* Until 430 PM MDT

* At 403 PM MDT, a severe thunderstorm was located near Dameron
  Valley, or 22 miles southeast of Beaver Dam, moving northwest at 10
  mph.

  HAZARD...Ping pong ball size hail and 60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees. 

* Locations impacted include...
  Dameron Valley, Veyo, Snow Canyon State Park and Gunlock. 

This includes Utah Route 18 between mile markers 15 and 22.
 
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 3730 11359 3725 11366 3734 11386 3743 11375
TIME...MOT...LOC 2203Z 123DEG 7KT 3737 11368 

HAIL...1.50IN
WIND...60MPH
 
$$

ND

2 follow-up statements

356 
WWUS55 KSLC 242213
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
413 PM MDT Sat Jul 24 2021

UTC053-242230-
/O.CON.KSLC.SV.W.0032.000000T0000Z-210724T2230Z/
Washington UT-
413 PM MDT Sat Jul 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM MDT
FOR WEST CENTRAL WASHINGTON COUNTY...

At 413 PM MDT, a severe thunderstorm was located near Dameron Valley,
or 21 miles southeast of Beaver Dam, moving northwest at 10 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees. 

Locations impacted include...
Dameron Valley, Veyo, Snow Canyon State Park and Gunlock. 

This includes Utah Route 18 between mile markers 15 and 22.
 
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 3730 11359 3725 11366 3734 11386 3743 11375
TIME...MOT...LOC 2213Z 123DEG 7KT 3738 11370 

HAIL...1.50IN
WIND...60MPH
 
$$

ND

859 
WWUS55 KSLC 242225
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
425 PM MDT Sat Jul 24 2021

UTC053-242233-
/O.EXP.KSLC.SV.W.0032.000000T0000Z-210724T2230Z/
Washington UT-
425 PM MDT Sat Jul 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL WASHINGTON COUNTY
WILL EXPIRE AT 430 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.

LAT...LON 3730 11359 3725 11366 3734 11386 3743 11375
TIME...MOT...LOC 2223Z 123DEG 7KT 3739 11372 

$$

ND

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 6:14 PM MDT	Areal Flood Advisory	SLC	Washington	61 min
Jul 24, 3:23 AM MDT	Flash Flood Watch	SLC	Beaver, Garfield, Iron, Kane, Piute, Washington and 1 more	42 hr
Jul 24, 12:56 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane	3 hr
Jul 24, 12:58 PM MDT	Special Weather Statement	SLC	Kane	32 min
Jul 24, 1:34 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield, Kane	4 hr
Jul 24, 2:13 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Washington	3 hr
Jul 24, 2:24 PM MDT	Severe Thunderstorm Warning	SLC	Washington	21 min
Jul 24, 3:16 PM MDT	Severe Thunderstorm Warning	SLC	Washington	29 min
Jul 24, 3:40 PM MDT	Severe Thunderstorm Warning	SLC	Iron, Washington	35 min
Jul 24, 4:07 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane, Washington	3 hr
Jul 24, 4:12 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron, Washington	3 hr
Jul 24, 4:30 PM MDT	Severe Thunderstorm Warning	SLC	Washington	30 min
Jul 24, 5:24 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Washington	3 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.