Alert archive / Utah / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 44, NWS Salt Lake City, UT

July 29, 2021Iron County, Washington County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 29, 2021, 2:00 PM MDT for Iron County, Washington County, Utah. It was in force for 30 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, 2:00 PM MDT (20:00 UTC)
Expired: Jul 29, 2021, 2:30 PM MDT
In force: 30 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Hail: 1.5 in
Wind: 50.0 mph

Counties Iron County, UT, Washington County, UT

The radar

The Cedar City radar (KICX), 43 km from the middle of the area, began a volume at 20:02 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, 8.0 hours before the alert went out and 241 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: 2 J/kg
Mixed-layer CIN: -212 J/kg
Mixed-layer LCL: 3039 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

950 
WUUS55 KSLC 292000
SVRSLC
UTC021-053-292030-
/O.NEW.KSLC.SV.W.0044.210729T2000Z-210729T2030Z/

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

The National Weather Service in Salt Lake City has issued a

* Severe Thunderstorm Warning for...
  Northeastern Washington County in southwestern Utah...
  South central Iron County in southern Utah...

* Until 230 PM MDT

* At 159 PM MDT, a severe thunderstorm was located 14 miles north of
  New Harmony, or 15 miles west of Cedar City, moving east at 5 mph.

  HAZARD...Ping pong ball size hail. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Cedar City.

This includes Utah Route 56 between mile markers 38 and 56.
 
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 3761 11348 3779 11339 3774 11312 3749 11324
TIME...MOT...LOC 1959Z 292DEG 6KT 3768 11336 

HAIL...1.50IN
WIND...<50MPH
 
$$

ND

2 follow-up statements

469 
WWUS55 KSLC 292018
SVSSLC

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

UTC021-053-292030-
/O.CON.KSLC.SV.W.0044.000000T0000Z-210729T2030Z/
Washington UT-Iron UT-
218 PM MDT Thu Jul 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM MDT
FOR NORTHEASTERN WASHINGTON AND SOUTH CENTRAL IRON COUNTIES...

At 218 PM MDT, a severe thunderstorm was located 13 miles north of
New Harmony, or 13 miles west of Cedar City, moving east at 5 mph.

HAZARD...Ping pong ball size hail. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Cedar City.

This includes Utah Route 56 between mile markers 38 and 56.
 
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 3761 11348 3779 11339 3774 11312 3749 11324
TIME...MOT...LOC 2018Z 292DEG 6KT 3767 11332 

HAIL...1.50IN
WIND...<50MPH
 
$$

ND

551 
WWUS55 KSLC 292026
SVSSLC

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

UTC021-053-292036-
/O.EXP.KSLC.SV.W.0044.000000T0000Z-210729T2030Z/
Washington UT-Iron UT-
226 PM MDT Thu Jul 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WASHINGTON AND
SOUTH CENTRAL IRON COUNTIES WILL EXPIRE AT 230 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 3761 11348 3779 11339 3774 11312 3749 11324
TIME...MOT...LOC 2026Z 292DEG 6KT 3767 11331 

$$

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, 2:17 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
Jul 29, 5:42 PM MDT	Severe Thunderstorm Warning	SLC	Garfield	33 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.