Alert archive / Utah / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 48, NWS Salt Lake City, UT

July 29, 2021Garfield County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 29, 2021, 5:42 PM MDT for Garfield County, Utah. It was in force for 33 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 29, 2021, 5:42 PM MDT (23:42 UTC)
Expired: Jul 29, 2021, 6:15 PM MDT
In force: 33 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Garfield County, UT

The radar

The Cedar City radar (KICX), 102 km from the middle of the area, began a volume at 23:44 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, 11.7 hours before the alert went out and 287 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: 156 J/kg
Mixed-layer CIN: -113 J/kg
Mixed-layer LCL: 1821 m above ground
0-6 km bulk shear: 15 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: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

488 
WUUS55 KSLC 292342
SVRSLC
UTC017-300015-
/O.NEW.KSLC.SV.W.0048.210729T2342Z-210730T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
542 PM MDT Thu Jul 29 2021

The National Weather Service in Salt Lake City has issued a

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

* Until 615 PM MDT

* At 542 PM MDT, a severe thunderstorm was located 7 miles west of
  Escalante, moving northwest at 10 mph.

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

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Escalante.

This includes Utah Route 12 between mile markers 46 and 59.
 
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 3778 11159 3767 11177 3782 11199 3799 11173
TIME...MOT...LOC 2342Z 140DEG 7KT 3779 11174 

HAIL...1.00IN
WIND...60MPH
 
$$

ND

2 follow-up statements

155 
WWUS55 KSLC 292357
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
557 PM MDT Thu Jul 29 2021

UTC017-300015-
/O.CON.KSLC.SV.W.0048.000000T0000Z-210730T0015Z/
Garfield UT-
557 PM MDT Thu Jul 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM MDT
FOR CENTRAL GARFIELD COUNTY...

At 557 PM MDT, a severe thunderstorm was located 9 miles west of
Escalante, moving northwest at 10 mph.

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

SOURCE...Radar indicated. 

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

This severe thunderstorm will remain over mainly rural areas of
central Garfield County.

This includes Utah Route 12 between mile markers 47 and 51, and near
mile marker 54.
 
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 3780 11163 3770 11179 3782 11199 3799 11173
TIME...MOT...LOC 2357Z 140DEG 7KT 3781 11176 

HAIL...1.00IN
WIND...60MPH
 
$$

ND

283 
WWUS55 KSLC 300010
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
610 PM MDT Thu Jul 29 2021

UTC017-300020-
/O.EXP.KSLC.SV.W.0048.000000T0000Z-210730T0015Z/
Garfield UT-
610 PM MDT Thu Jul 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL GARFIELD COUNTY WILL
EXPIRE AT 615 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 possible with this thunderstorm.

LAT...LON 3780 11163 3770 11179 3782 11199 3799 11173
TIME...MOT...LOC 0010Z 140DEG 7KT 3782 11177 

$$

ND

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 7:56 PM MDT	Special Weather Statement	SLC	Tooele	49 min
Jul 28, 9:52 PM MDT	Special Weather Statement	SLC	Davis	83 min
Jul 29, 2:38 AM MDT	Flash Flood Watch	SLC	Emery, Garfield, Kane, San Juan, Sevier, Washington and 1 more	21 hr
Jul 29, 1:40 PM MDT	Special Weather Statement	SLC	Iron	20 min
Jul 29, 2:00 PM MDT	Severe Thunderstorm Warning	SLC	Iron, Washington	30 min
Jul 29, 2:17 PM MDT	Special Weather Statement	SLC	Piute	28 min
Jul 29, 2:26 PM MDT	Special Weather Statement	SLC	Beaver	34 min
Jul 29, 2:39 PM MDT	Severe Thunderstorm Warning	SLC	Beaver, Iron	36 min
Jul 29, 2:50 PM MDT	Areal Flood Advisory	SLC	Beaver	115 min
Jul 29, 3:13 PM MDT	Special Weather Statement	SLC	Beaver	32 min
Jul 29, 3:33 PM MDT	Special Weather Statement	SLC	Iron	27 min
Jul 29, 3:54 PM MDT	Special Weather Statement	SLC	Millard	36 min
Jul 29, 4:11 PM MDT	Special Weather Statement	SLC		34 min
Jul 29, 4:22 PM MDT	Special Weather Statement	SLC	Juab	23 min
Jul 29, 4:37 PM MDT	Special Weather Statement	SLC	Garfield	23 min
Jul 29, 4:48 PM MDT	Severe Thunderstorm Warning	SLC	Garfield, Iron	27 min
Jul 29, 4:54 PM MDT	Severe Thunderstorm Warning	SLC	Piute, Sevier	36 min
Jul 29, 5:18 PM MDT	Special Weather Statement	SLC	Garfield	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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.