Alert archive / Utah / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 12, NWS Salt Lake City, UT

July 14, 2021Iron County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 14, 2021, 4:39 PM MDT for Iron County, Utah. It was in force for 66 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 14, 2021, 4:39 PM MDT (22:39 UTC)
Expired: Jul 14, 2021, 5:45 PM MDT
In force: 66 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), 15 km from the middle of the area, began a volume at 22:39 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 14, 4:45 PM MDT	HAIL 1	Enoch, UT	HAIL UP TO QUARTER SIZE MEASURED. REPORTED VIA SOCIAL MEDIA.

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, 10.7 hours before the alert went out and 273 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: 448 J/kg
Mixed-layer CIN: -374 J/kg
Mixed-layer LCL: 2057 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -19 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

748 
WUUS55 KSLC 142239
SVRSLC
UTC021-142345-
/O.NEW.KSLC.SV.W.0012.210714T2239Z-210714T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
439 PM MDT Wed Jul 14 2021

The National Weather Service in Salt Lake City has issued a

* Severe Thunderstorm Warning for...
  Southeastern Iron County in southern Utah...

* Until 545 PM MDT

* At 438 PM MDT, a severe thunderstorm was located near Enoch, or 8
  miles northeast of Cedar City, moving south at 5 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, Cedar Breaks National Monument, Summit
  and Brian Head.

This includes the following highways...
 Interstate 15 between mile markers 60 and 75.
 Utah Route 56 near mile marker 61.

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 3781 11309 3784 11286 3765 11275 3757 11286
      3757 11307
TIME...MOT...LOC 2238Z 342DEG 5KT 3777 11298 

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

Church

2 follow-up statements

830 
WWUS55 KSLC 142315
SVSSLC

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

UTC021-142345-
/O.CON.KSLC.SV.W.0012.000000T0000Z-210714T2345Z/
Iron UT-
515 PM MDT Wed Jul 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM MDT
FOR SOUTHEASTERN IRON COUNTY...

At 515 PM MDT, a severe thunderstorm was located near Enoch, or near
Cedar City, moving south at 5 mph.

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

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

Locations impacted include...
Cedar City, Cedar Breaks National Monument and Brian Head. 

This includes the following highways...
 Interstate 15 between mile markers 60 and 63.
 Utah Route 56 near mile marker 61.

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 3773 11308 3778 11289 3765 11275 3757 11286
      3757 11307
TIME...MOT...LOC 2315Z 342DEG 5KT 3772 11296 

HAIL...0.75IN
WIND...60MPH
 
$$

Church

618 
WWUS55 KSLC 142337
SVSSLC

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

UTC021-142347-
/O.EXP.KSLC.SV.W.0012.000000T0000Z-210714T2345Z/
Iron UT-
537 PM MDT Wed Jul 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN IRON COUNTY WILL
EXPIRE AT 545 PM MDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

LAT...LON 3773 11308 3778 11289 3765 11275 3757 11286
      3757 11307
TIME...MOT...LOC 2337Z 342DEG 5KT 3908 11050 

$$

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, 3:31 PM MDT	Severe Thunderstorm Warning	SLC	Garfield	29 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, 4:54 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.