Alert archive / Utah / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 68, NWS Salt Lake City, UT

August 17, 2021Beaver County, Garfield County, Piute County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 17, 2021, 2:23 PM MDT for Beaver County, Garfield County, Piute County, Utah. It was in force for 52 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: Aug 17, 2021, 2:23 PM MDT (20:23 UTC)
Expired: Aug 17, 2021, 3:15 PM MDT
In force: 52 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Beaver County, UT, Garfield County, UT, Piute County, UT

The radar

The Cedar City radar (KICX), 83 km from the middle of the area, began a volume at 20:23 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
Aug 17, 2:54 PM MDT	HAIL 2	10 Ese Beaver, UT	PUBLIC PHOTO AND VIDEO SHOWS EST 2 INCH HAIL WITH SIGNIFICANT DAMAGE TO CAMPER TRAILER AND TRUCK.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 8.4 hours before the alert went out and 287 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3488 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

442 
WUUS55 KSLC 172023
SVRSLC
UTC001-017-031-172115-
/O.NEW.KSLC.SV.W.0068.210817T2023Z-210817T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
223 PM MDT Tue Aug 17 2021

The National Weather Service in Salt Lake City has issued a

* Severe Thunderstorm Warning for...
  Southwestern Piute County in central Utah...
  Northwestern Garfield County in southern Utah...
  Southeastern Beaver County in southern Utah...

* Until 315 PM MDT

* At 222 PM MDT, a severe thunderstorm was located 9 miles west of
  Junction, moving northeast at 10 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...
  Junction, Circleville and Kingston. 

This includes US Route 89 between mile markers 154 and 175.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3815 11252 3829 11253 3841 11220 3821 11213
      3809 11213
TIME...MOT...LOC 2022Z 245DEG 10KT 3824 11240 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Church

3 follow-up statements

303 
WWUS55 KSLC 172029
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
229 PM MDT Tue Aug 17 2021

UTC001-017-031-172115-
/O.CON.KSLC.SV.W.0068.000000T0000Z-210817T2115Z/
Piute UT-Garfield UT-Beaver UT-
229 PM MDT Tue Aug 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM MDT
FOR SOUTHWESTERN PIUTE...NORTHWESTERN GARFIELD AND SOUTHEASTERN
BEAVER COUNTIES...

At 227 PM MDT, a severe thunderstorm was located 8 miles west of
Junction, moving northeast at 10 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. 

Locations impacted include...
Junction, Circleville and Kingston. 

This includes US Route 89 between mile markers 154 and 175.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3815 11252 3829 11253 3841 11220 3821 11213
      3809 11213
TIME...MOT...LOC 2027Z 245DEG 10KT 3825 11238 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Church

328 
WWUS55 KSLC 172050
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
250 PM MDT Tue Aug 17 2021

UTC001-017-031-172115-
/O.CON.KSLC.SV.W.0068.000000T0000Z-210817T2115Z/
Piute UT-Garfield UT-Beaver UT-
250 PM MDT Tue Aug 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM MDT
FOR SOUTHWESTERN PIUTE...NORTHWESTERN GARFIELD AND SOUTHEASTERN
BEAVER COUNTIES...

At 249 PM MDT, a severe thunderstorm was located near Junction,
moving northeast 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...
Junction, Circleville and Kingston. 

This includes US Route 89 between mile markers 154 and 171.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3815 11252 3826 11251 3836 11218 3821 11213
      3809 11213
TIME...MOT...LOC 2049Z 245DEG 10KT 3828 11231 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Church

807 
WWUS55 KSLC 172112
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
312 PM MDT Tue Aug 17 2021

UTC001-017-031-172122-
/O.EXP.KSLC.SV.W.0068.000000T0000Z-210817T2115Z/
Piute UT-Garfield UT-Beaver UT-
312 PM MDT Tue Aug 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN PIUTE...
NORTHWESTERN GARFIELD AND SOUTHEASTERN BEAVER COUNTIES WILL EXPIRE AT
315 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, gusty winds and heavy rain are still possible with this
thunderstorm.

LAT...LON 3815 11252 3826 11251 3836 11218 3821 11213
      3809 11213
TIME...MOT...LOC 2112Z 245DEG 10KT 3830 11225 

$$

Church

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 1:31 PM MDT	Special Weather Statement	SLC	Kane	44 min
Aug 17, 1:50 PM MDT	Severe Thunderstorm Warning	SLC	Garfield, Kane	20 min
Aug 17, 2:50 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield	3 hr
Aug 17, 3:14 PM MDT	Special Weather Statement	SLC	Juab	31 min
Aug 17, 3:20 PM MDT	Special Weather Statement	SLC	Tooele	25 min
Aug 17, 3:29 PM MDT	Severe Thunderstorm Warning	SLC	Sevier	46 min
Aug 17, 3:51 PM MDT	Severe Thunderstorm Warning	SLC	Tooele	24 min
Aug 17, 4:12 PM MDT	Severe Thunderstorm Warning Considerable damage threat	SLC	Tooele	48 min
Aug 17, 4:18 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Emery, Wayne	3 hr
Aug 17, 4:29 PM MDT	Severe Thunderstorm Warning	SLC	Tooele	46 min
Aug 17, 4:39 PM MDT	Severe Thunderstorm Warning Considerable damage threat	SLC	Millard	66 min
Aug 17, 4:53 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield	3 hr
Aug 17, 4:56 PM MDT	Severe Thunderstorm Warning	SLC	Garfield	24 min
Aug 17, 5:00 PM MDT	Severe Thunderstorm Warning	SLC	Davis, Salt Lake, Tooele	30 min
Aug 17, 5:10 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane	4 hr
Aug 17, 5:12 PM MDT	Severe Thunderstorm Warning	SLC	Tooele	63 min
Aug 17, 5:30 PM MDT	Severe Thunderstorm Warning Considerable damage threat	SLC	Davis, Salt Lake	45 min
Aug 17, 5:37 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield, Kane	6 hr
Aug 17, 5:40 PM MDT	Severe Thunderstorm Warning	SLC	Millard	50 min
Aug 17, 5:48 PM MDT	Special Weather Statement	SLC	Sanpete	27 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.