Alert archive / Utah / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 41, NWS Salt Lake City, UT

July 26, 2021Washington County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 26, 2021, 3:30 PM MDT for 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 26, 2021, 3:30 PM MDT (21:30 UTC)
Expired: Jul 26, 2021, 4:00 PM MDT
In force: 30 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Washington County, UT

The radar

The Cedar City radar (KICX), 79 km from the middle of the area, began a volume at 21:31 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, 9.5 hours before the alert went out and 197 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: 467 J/kg
Mixed-layer CIN: -144 J/kg
Mixed-layer LCL: 1095 m above ground
0-6 km bulk shear: 26 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: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

731 
WUUS55 KSLC 262130
SVRSLC
UTC053-262200-
/O.NEW.KSLC.SV.W.0041.210726T2130Z-210726T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
330 PM MDT Mon Jul 26 2021

The National Weather Service in Salt Lake City has issued a

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

* Until 400 PM MDT

* At 330 PM MDT, a severe thunderstorm was located over Washington,
  or 20 miles northeast of Virgin River Gorge, moving northwest at 10
  mph.

  HAZARD...60 mph wind gusts and half dollar size hail. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  St George, Washington, Santa Clara, Ivins and Snow Canyon State
  Park.

This includes the following highways...
 Interstate 15 between mile markers 5 and 15.
 Utah Route 18 between mile markers 0 and 11.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3709 11341 3703 11352 3714 11377 3729 11356
TIME...MOT...LOC 2130Z 124DEG 10KT 3709 11350 

HAIL...1.25IN
WIND...60MPH
 
$$

Webber

1 follow-up statement

078 
WWUS55 KSLC 262202
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
402 PM MDT Mon Jul 26 2021

UTC053-262211-
/O.EXP.KSLC.SV.W.0041.000000T0000Z-210726T2200Z/
Washington UT-
402 PM MDT Mon Jul 26 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL WASHINGTON
COUNTY HAS EXPIRED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire.  However small
hail, gusty winds and heavy rain are still possible with this 
thunderstorm. A new Severe Thunderstorm Warning has been issued and 
is in effect through 430 PM.

LAT...LON 3709 11341 3703 11352 3714 11377 3729 11356
TIME...MOT...LOC 2201Z 270DEG 10KT 3714 11359 

$$

Webber

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 6:06 PM MDT	Special Weather Statement	SLC	Washington	39 min
Jul 25, 6:16 PM MDT	Special Weather Statement	SLC	Washington	44 min
Jul 26, 3:37 AM MDT	Flash Flood Watch	SLC	Beaver, Garfield, Iron, Kane, Piute, Washington and 1 more	20 hr
Jul 26, 1:13 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane, Washington	3 hr
Jul 26, 1:37 PM MDT	Severe Thunderstorm Warning	SLC	Washington	23 min
Jul 26, 1:40 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield	3 hr
Jul 26, 1:47 PM MDT	Special Weather Statement	SLC	Piute	43 min
Jul 26, 2:00 PM MDT	Special Weather Statement	SLC	Washington	45 min
Jul 26, 2:07 PM MDT	Areal Flood Advisory	SLC	Washington	53 min
Jul 26, 2:12 PM MDT	Areal Flood Advisory	SLC	Iron	2 hr
Jul 26, 2:35 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron	115 min
Jul 26, 2:45 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield	4 hr
Jul 26, 2:53 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron, Washington	3 hr
Jul 26, 3:01 PM MDT	Severe Thunderstorm Warning	SLC	Beaver, Iron	29 min
Jul 26, 3:07 PM MDT	Severe Thunderstorm Warning	SLC	Beaver, Iron	23 min
Jul 26, 3:20 PM MDT	Severe Thunderstorm Warning	SLC	Beaver, Iron	2 min
Jul 26, 3:26 PM MDT	Special Weather Statement	SLC	Washington	49 min
Jul 26, 3:32 PM MDT	Areal Flood Advisory	SLC	Washington	118 min
Jul 26, 3:32 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Beaver	3 hr
Jul 26, 4:00 PM MDT	Severe Thunderstorm Warning	SLC	Washington	30 min
Jul 26, 4:34 PM MDT	Special Weather Statement	SLC	Washington	41 min
Jul 26, 4:55 PM MDT	Special Weather Statement	SLC	Beaver	50 min
Jul 26, 5:30 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane	6 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.