Alert archive / Utah / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 19, NWS Salt Lake City, UT

July 19, 2021Iron County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 19, 2021, 3:22 PM MDT for Iron County, Utah. It was in force for 38 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 19, 2021, 3:22 PM MDT (21:22 UTC)
Expired: Jul 19, 2021, 4:00 PM MDT
In force: 38 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

County Iron County, UT

The radar

The Cedar City radar (KICX), 44 km from the middle of the area, began a volume at 21:22 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, 9.4 hours before the alert went out and 236 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: 127 J/kg
Mixed-layer CIN: -232 J/kg
Mixed-layer LCL: 1964 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

296 
WUUS55 KSLC 192122
SVRSLC
UTC021-192200-
/O.NEW.KSLC.SV.W.0019.210719T2122Z-210719T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
322 PM MDT Mon Jul 19 2021

The National Weather Service in Salt Lake City has issued a

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

* Until 400 PM MDT

* At 322 PM MDT, a severe thunderstorm was located 9 miles north of
  New Harmony, or 16 miles west of Cedar City, moving northeast at 5
  mph.

  HAZARD...Ping pong ball size hail and 60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* This severe thunderstorm will remain over mainly rural areas of
  south central Iron County.

This includes Utah Route 56 between mile markers 39 and 51.
 
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 3753 11336 3753 11345 3770 11343 3766 11322
TIME...MOT...LOC 2122Z 209DEG 5KT 3761 11337 

HAIL...1.50IN
WIND...60MPH
 
$$

Woodward

1 follow-up statement

993 
WWUS55 KSLC 192151
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
351 PM MDT Mon Jul 19 2021

UTC021-192201-
/O.EXP.KSLC.SV.W.0019.000000T0000Z-210719T2200Z/
Iron UT-
351 PM MDT Mon Jul 19 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL IRON 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 small hail
is still possible with this thunderstorm.

LAT...LON 3753 11336 3753 11345 3770 11343 3766 11325
TIME...MOT...LOC 2151Z 209DEG 5KT 3764 11334 

$$

Woodward

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 7:02 PM MDT	Special Weather Statement	SLC	Tooele	43 min
Jul 18, 7:54 PM MDT	Special Weather Statement	SLC	Tooele	51 min
Jul 19, 4:32 AM MDT	Flash Flood Watch	SLC	Beaver, Carbon, Duchesne, Emery, Garfield, Iron and 12 more	19 hr
Jul 19, 1:44 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane, Washington	5 hr
Jul 19, 2:34 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron, Washington	3 hr
Jul 19, 2:45 PM MDT	Areal Flood Advisory	SLC	Iron	3 hr
Jul 19, 2:53 PM MDT	Special Weather Statement	SLC	Iron	52 min
Jul 19, 3:04 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron	3 hr
Jul 19, 3:46 PM MDT	Special Weather Statement	SLC	Utah	44 min
Jul 19, 4:54 PM MDT	Special Weather Statement	SLC	Davis, Salt Lake	36 min
Jul 19, 5:57 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron, Washington	3 hr

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.