Alert archive / Utah / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 34, NWS Salt Lake City, UT

July 25, 2021Iron County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 25, 2021, 3:49 PM MDT for Iron 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 25, 2021, 3:49 PM MDT (21:49 UTC)
Expired: Jul 25, 2021, 4:15 PM MDT
In force: 26 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Iron County, UT

The radar

The Cedar City radar (KICX), 31 km from the middle of the area, began a volume at 21:50 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 25, 4:10 PM MDT	TSTM WND GST 61	3 N Cedar City, UT	MEASURED AT THE UDOT RWIS ALONG I-15 AT MP 62.5

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, 9.8 hours before the alert went out and 285 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: 97 J/kg
Mixed-layer CIN: -248 J/kg
Mixed-layer LCL: 2117 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

717 
WUUS55 KSLC 252149
SVRSLC
UTC021-252215-
/O.NEW.KSLC.SV.W.0034.210725T2149Z-210725T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
349 PM MDT Sun Jul 25 2021

The National Weather Service in Salt Lake City has issued a

* Severe Thunderstorm Warning for...
  East central Iron County in southern Utah...

* Until 415 PM MDT

* At 348 PM MDT, a severe thunderstorm was located near Parowan, or
  17 miles northeast of Cedar City, moving southwest at 20 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...
  Cedar City, Enoch, Parowan, Paragonah and Summit. 

This includes Interstate 15 between mile markers 62 and 82.
 
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 3800 11287 3786 11273 3763 11298 3784 11320
TIME...MOT...LOC 2148Z 050DEG 16KT 3789 11288 

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

ND

2 follow-up statements

919 
WWUS55 KSLC 252159
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
359 PM MDT Sun Jul 25 2021

UTC021-252215-
/O.CON.KSLC.SV.W.0034.000000T0000Z-210725T2215Z/
Iron UT-
359 PM MDT Sun Jul 25 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM MDT
FOR EAST CENTRAL IRON COUNTY...

At 359 PM MDT, a severe thunderstorm was located near Parowan, or 14
miles northeast of Cedar City, moving southwest at 20 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...
Cedar City, Enoch, Parowan and Summit. 

This includes Interstate 15 between mile markers 62 and 79.
 
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 3797 11291 3783 11276 3763 11298 3784 11320
TIME...MOT...LOC 2159Z 050DEG 16KT 3786 11293 

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

ND

058 
WWUS55 KSLC 252211
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
411 PM MDT Sun Jul 25 2021

UTC021-252221-
/O.EXP.KSLC.SV.W.0034.000000T0000Z-210725T2215Z/
Iron UT-
411 PM MDT Sun Jul 25 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL IRON COUNTY WILL
EXPIRE AT 415 PM MDT...
    
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning will be allowed to expire.  However gusty 
winds are still possible with this thunderstorm.

LAT...LON 3797 11291 3783 11276 3763 11298 3784 11320
TIME...MOT...LOC 2211Z 050DEG 16KT 3783 11297 

$$

ND

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 7:17 PM MDT	Special Weather Statement	SLC	Garfield	28 min
Jul 24, 8:08 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield, Kane	3 hr
Jul 25, 2:25 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron	3 hr
Jul 25, 2:49 PM MDT	Special Weather Statement	SLC	Piute	26 min
Jul 25, 2:53 PM MDT	Special Weather Statement	SLC	Beaver	37 min
Jul 25, 3:11 PM MDT	Special Weather Statement	SLC	Piute	34 min
Jul 25, 3:18 PM MDT	Special Weather Statement	SLC	Sevier	27 min
Jul 25, 3:33 PM MDT	Special Weather Statement	SLC	Iron	27 min
Jul 25, 4:11 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron	3 hr
Jul 25, 4:21 PM MDT	Special Weather Statement	SLC	Washington	24 min
Jul 25, 4:29 PM MDT	Areal Flood Advisory	SLC	Iron	3 hr
Jul 25, 4:41 PM MDT	Special Weather Statement	SLC	Washington	19 min
Jul 25, 4:41 PM MDT	Special Weather Statement	SLC	Iron	49 min
Jul 25, 4:52 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron, Kane, Washington	4 hr
Jul 25, 5:16 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Washington	3 hr
Jul 25, 5:26 PM MDT	Severe Thunderstorm Warning	SLC	Washington	19 min
Jul 25, 5:42 PM MDT	Severe Thunderstorm Warning	SLC	Washington	33 min
Jul 25, 5:44 PM MDT	Special Weather Statement	SLC	Washington	31 min
Jul 25, 5:52 PM MDT	Special Weather Statement	SLC	Washington	23 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.