Alert archive / Utah / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 10, NWS Salt Lake City, UT

July 14, 2021Garfield County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 14, 2021, 3:31 PM MDT for Garfield County, Utah. It was in force for 29 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 14, 2021, 3:31 PM MDT (21:31 UTC)
Expired: Jul 14, 2021, 4:00 PM MDT
In force: 29 min
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), 125 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 275 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: 17 J/kg
Mixed-layer CIN: -187 J/kg
Mixed-layer LCL: 1682 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

743 
WUUS55 KSLC 142131
SVRSLC
UTC017-142200-
/O.NEW.KSLC.SV.W.0010.210714T2131Z-210714T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
331 PM MDT Wed Jul 14 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 330 PM MDT, a severe thunderstorm was located 7 miles southeast
  of Escalante, and is nearly stationary.

  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 includes Utah Route 12 between mile markers 62 and 75.
 
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 3775 11157 3781 11137 3759 11119 3754 11154
TIME...MOT...LOC 2130Z 342DEG 3KT 3771 11148 

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

Church

2 follow-up statements

869 
WWUS55 KSLC 142144
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
344 PM MDT Wed Jul 14 2021

UTC017-142200-
/O.CON.KSLC.SV.W.0010.000000T0000Z-210714T2200Z/
Garfield UT-
344 PM MDT Wed Jul 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM MDT
FOR SOUTH CENTRAL GARFIELD COUNTY...

At 344 PM MDT, a severe thunderstorm was located 8 miles southeast of
Escalante, and is nearly stationary.

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.

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 3772 11144 3776 11133 3759 11119 3756 11140
TIME...MOT...LOC 2144Z 342DEG 3KT 3770 11148 

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

Church

585 
WWUS55 KSLC 142157
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
357 PM MDT Wed Jul 14 2021

UTC017-142206-
/O.EXP.KSLC.SV.W.0010.000000T0000Z-210714T2200Z/
Garfield UT-
357 PM MDT Wed Jul 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL GARFIELD COUNTY
WILL EXPIRE AT 400 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 heavy rain
is still expected with this thunderstorm.

Remember, a Flash Flood Warning still remains in effect for the Hole-
In-The-Rock and Escalante River areas. 

LAT...LON 3772 11144 3776 11133 3759 11119 3756 11140
TIME...MOT...LOC 2156Z 342DEG 3KT 3769 11148 

$$

Church

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 6:02 PM MDT	Special Weather Statement	SLC	Beaver, Iron	58 min
Jul 13, 7:10 PM MDT	Special Weather Statement	SLC	Iron	65 min
Jul 13, 8:14 PM MDT	Special Weather Statement	SLC	Washington	61 min
Jul 14, 9:32 AM MDT	Flash Flood Watch	SLC	Emery, Garfield, Kane, San Juan, Sevier, Washington and 1 more	12 hr
Jul 14, 1:36 PM MDT	Special Weather Statement	SLC	Duchesne	39 min
Jul 14, 2:27 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Carbon	2 hr
Jul 14, 2:28 PM MDT	Special Weather Statement	SLC	Kane	62 min
Jul 14, 3:06 PM MDT	Special Weather Statement	SLC	Garfield	39 min
Jul 14, 3:45 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield, Kane, San Juan	6 hr
Jul 14, 4:01 PM MDT	Severe Thunderstorm Warning	SLC	Iron	44 min
Jul 14, 4:21 PM MDT	Special Weather Statement	SLC	Carbon	39 min
Jul 14, 4:39 PM MDT	Severe Thunderstorm Warning	SLC	Iron	66 min
Jul 14, 4:54 PM MDT	Areal Flood Advisory	SLC	Iron	111 min
Jul 14, 5:04 PM MDT	Special Weather Statement	SLC	Salt Lake	41 min
Jul 14, 5:06 PM MDT	Special Weather Statement	SLC	Emery	54 min
Jul 14, 5:20 PM MDT	Special Weather Statement	SLC	Kane	40 min
Jul 14, 5:29 PM MDT	Areal Flood Advisory	SLC	Iron	2 hr
Jul 14, 5:35 PM MDT	Severe Thunderstorm Warning	SLC	Emery	40 min
Jul 14, 5:42 PM MDT	Special Weather Statement	SLC	Utah	48 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.