Alert archive / Utah / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 23, NWS Salt Lake City, UT

July 22, 2021Garfield County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 22, 2021, 3:30 PM MDT for Garfield County, Utah. It was in force for . 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 22, 2021, 3:30 PM MDT (21:30 UTC)
Expired: Jul 22, 2021, 3:30 PM MDT
In force
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Garfield County, UT

The radar

The Cedar City radar (KICX), 129 km from the middle of the area, began a volume at 21:31 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 9.5 hours before the alert went out and 276 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: 196 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 1415 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

820 
WUUS55 KSLC 222130
SVRSLC
UTC017-222200-
/O.NEW.KSLC.SV.W.0023.210722T2130Z-210722T2200Z/

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

The National Weather Service in Salt Lake City has issued a

* Severe Thunderstorm Warning for...
  South central Garfield County in southern Utah...

* Until 400 PM MDT

* At 329 PM MDT, a severe thunderstorm was located 8 miles southeast
  of Escalante, moving east around 20 mph.

  HAZARD...Quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Damage to vehicles is expected. 

* This severe thunderstorm will remain over mainly rural areas of 
  south central Garfield County. This thunderstorm is expected to 
  track over Phipps Wash in Escalante National Park. 

This includes Utah Route 12 between mile markers 63 and 76.
 
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 3763 11156 3779 11156 3783 11118 3760 11118
TIME...MOT...LOC 2129Z 252DEG 18KT 3771 11147 

HAIL...1.00IN
WIND...<50MPH
 
$$

ND

1 follow-up statement

530 
WWUS55 KSLC 222130
SVSSLC

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

UTC017-222140-
/O.CAN.KSLC.SV.W.0023.000000T0000Z-210722T2200Z/
Garfield UT-
330 PM MDT Thu Jul 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL GARFIELD COUNTY
IS CANCELLED...
                
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 cancelled.

LAT...LON 3763 11156 3779 11156 3783 11118 3760 11118
TIME...MOT...LOC 2128Z 252DEG 18KT 3771 11146 

$$

ND

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 8:41 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane	6 hr
Jul 22, 2:43 AM MDT	Flash Flood Watch	SLC	Emery, Garfield, Kane, Sevier, Washington, Wayne	20 hr
Jul 22, 11:16 AM MDT	Special Weather Statement	SLC	Piute	29 min
Jul 22, 11:41 AM MDT	Special Weather Statement	SLC		49 min
Jul 22, 11:54 AM MDT	Flood Watch	SLC	Beaver, Garfield, Iron, Kane, Piute, Washington and 1 more	11 hr
Jul 22, 1:02 PM MDT	Special Weather Statement	SLC	Iron	43 min
Jul 22, 1:13 PM MDT	Special Weather Statement	SLC	Garfield	32 min
Jul 22, 1:18 PM MDT	Areal Flood Advisory	SLC	Iron	117 min
Jul 22, 1:20 PM MDT	Severe Thunderstorm Warning	SLC	Garfield	25 min
Jul 22, 1:45 PM MDT	Special Weather Statement	SLC	Kane	45 min
Jul 22, 2:00 PM MDT	Special Weather Statement	SLC	Beaver	30 min
Jul 22, 2:13 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield, Kane	3 hr
Jul 22, 2:13 PM MDT	Severe Thunderstorm Warning	SLC	Beaver	32 min
Jul 22, 2:34 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane, Washington	3 hr
Jul 22, 2:42 PM MDT	Areal Flood Advisory	SLC	Beaver	2 hr
Jul 22, 2:58 PM MDT	Severe Thunderstorm Warning	SLC	Washington	32 min
Jul 22, 3:08 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield, Wayne	3 hr
Jul 22, 3:14 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield, Kane	5 hr
Jul 22, 3:14 PM MDT	Special Weather Statement	SLC	Washington	46 min
Jul 22, 3:46 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield, Kane	7 hr
Jul 22, 4:02 PM MDT	Severe Thunderstorm Warning	SLC	Iron	28 min
Jul 22, 4:15 PM MDT	Special Weather Statement	SLC	Box Elder	30 min
Jul 22, 4:28 PM MDT	Severe Thunderstorm Warning	SLC	Iron	32 min
Jul 22, 4:48 PM MDT	Special Weather Statement	SLC	Washington	27 min
Jul 22, 5:51 PM MDT	Special Weather Statement	SLC		39 min
Jul 22, 5:58 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Utah	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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.