Alert archive / Utah / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 84, NWS Salt Lake City, UT

August 18, 2021Juab County, Tooele County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 18, 2021, 12:34 PM MDT for Juab County, Tooele County, Utah. It was in force for 56 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: Aug 18, 2021, 12:34 PM MDT (18:34 UTC)
Expired: Aug 18, 2021, 1:30 PM MDT
In force: 56 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Juab County, UT, Tooele County, UT

The radar

The Salt Lake City radar (KMTX), 145 km from the middle of the area, began a volume at 18:38 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 18, 12:14 PM MDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 6.6 hours before the alert went out and 97 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: 7 J/kg
Mixed-layer CIN: -398 J/kg
Mixed-layer LCL: 1192 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

801 
WUUS55 KSLC 181834
SVRSLC
UTC023-045-181930-
/O.NEW.KSLC.SV.W.0084.210818T1834Z-210818T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
1234 PM MDT Wed Aug 18 2021

The National Weather Service in Salt Lake City has issued a

* Severe Thunderstorm Warning for...
  Northeastern Juab County in central Utah...
  Southeastern Tooele County in northern Utah...

* Until 130 PM MDT

* At 1234 PM MDT, a severe thunderstorm was located 27 miles
  southwest of Vernon, or 30 miles north of Delta, moving northeast
  at 35 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...
  Vernon, Eureka, Little Sahara State Park, Lofgreen, Tintic Junction
  and Jericho.

This includes US Route 6 between mile markers 119 and 140.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4021 11226 4009 11215 4006 11218 4001 11217
      3997 11211 3995 11210 3970 11210 3963 11284
      3984 11293
TIME...MOT...LOC 1834Z 236DEG 30KT 3977 11277 

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

$$

Church

2 follow-up statements

329 
WWUS55 KSLC 181902
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
102 PM MDT Wed Aug 18 2021

UTC023-045-181930-
/O.CON.KSLC.SV.W.0084.000000T0000Z-210818T1930Z/
Juab UT-Tooele UT-
102 PM MDT Wed Aug 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM MDT
FOR NORTHEASTERN JUAB AND SOUTHEASTERN TOOELE COUNTIES...

At 102 PM MDT, a severe thunderstorm was located 13 miles south of
Vernon, or 27 miles southeast of Dugway English Village, moving
northeast at 35 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...
Vernon, Eureka, Little Sahara State Park, Lofgreen, Tintic Junction
and Jericho.

This includes US Route 6 between mile markers 119 and 140.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4021 11226 4009 11215 4006 11218 4001 11217
      3997 11211 3995 11210 3970 11210 3966 11248
      3966 11254 3997 11270
TIME...MOT...LOC 1902Z 236DEG 30KT 3990 11252 

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

$$

Church

268 
WWUS55 KSLC 181931
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
131 PM MDT Wed Aug 18 2021

UTC023-045-181939-
/O.EXP.KSLC.SV.W.0084.000000T0000Z-210818T1930Z/
Juab UT-Tooele UT-
131 PM MDT Wed Aug 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN JUAB AND
SOUTHEASTERN TOOELE COUNTIES WILL EXPIRE AT 130 PM MDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A severe thunderstorm watch remains in effect until 800 PM MDT for
central and northern Utah.

Remember, a Severe Thunderstorm Warning still remains in effect for 
southeastern Tooele, eastern Juab and Utah counties through 245 PM 
MDT.

LAT...LON 4021 11226 4009 11215 4006 11218 4001 11217
      3997 11211 3995 11210 3970 11210 3966 11248
      3966 11254 3997 11270
TIME...MOT...LOC 1929Z 270DEG 30KT 4001 11230 

$$

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, 6:05 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Millard	3 hr
Aug 17, 6:10 PM MDT	Severe Thunderstorm Warning	SLC	Juab	35 min
Aug 17, 6:31 PM MDT	Severe Thunderstorm Warning	SLC	Millard	59 min
Aug 17, 6:39 PM MDT	Special Weather Statement	SLC	Utah	36 min
Aug 17, 6:49 PM MDT	Severe Thunderstorm Warning	SLC	Utah, Wasatch	26 min
Aug 17, 6:57 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane, San Juan	5 hr
Aug 17, 7:14 PM MDT	Severe Thunderstorm Warning	SLC	Summit, Wasatch	31 min
Aug 17, 8:52 PM MDT	Special Weather Statement	SLC	Salt Lake	38 min
Aug 17, 9:30 PM MDT	Special Weather Statement	SLC	Tooele	30 min
Aug 17, 9:55 PM MDT	Special Weather Statement	SLC	Kane	35 min
Aug 17, 9:58 PM MDT	Special Weather Statement	SLC	Juab	32 min
Aug 17, 10:00 PM MDT	Special Weather Statement	SLC	Juab	30 min
Aug 17, 10:17 PM MDT	Special Weather Statement	SLC	Salt Lake	28 min
Aug 18, 12:23 AM MDT	Special Weather Statement	SLC		52 min
Aug 18, 12:31 AM MDT	Special Weather Statement	SLC	Millard	44 min
Aug 18, 12:45 AM MDT	Special Weather Statement	SLC	Juab	45 min
Aug 18, 1:42 AM MDT	Special Weather Statement	SLC	Juab	48 min
Aug 18, 4:38 AM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron	5 hr
Aug 18, 4:41 AM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron	3 hr
Aug 18, 6:02 AM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron, Washington	4 hr
Aug 18, 7:30 AM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane, Washington	90 min
Aug 18, 7:55 AM MDT	Areal Flood Warning	SLC	Garfield, Iron, Kane, Washington	6 hr
Aug 18, 8:58 AM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane, Washington	92 min
Aug 18, 11:05 AM MDT	Severe Thunderstorm Warning	SLC	Tooele	40 min
Aug 18, 11:45 AM MDT	Special Weather Statement	SLC	Salt Lake	45 min
Aug 18, 12:11 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield, Wayne	6 hr
Aug 18, 12:17 PM MDT	Areal Flood Advisory	SLC	Davis, Salt Lake, Tooele	2 hr
Aug 18, 12:29 PM MDT	Special Weather Statement	SLC		31 min
Aug 18, 12:47 PM MDT	Special Weather Statement	SLC	Piute	28 min
Aug 18, 1:05 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Wayne	3 hr
Aug 18, 1:12 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield	2 hr
Aug 18, 1:14 PM MDT	Special Weather Statement	SLC	Beaver	31 min
Aug 18, 1:24 PM MDT	Areal Flood Warning	SLC	Juab, Salt Lake, Tooele, Utah	3 hr
Aug 18, 1:24 PM MDT	Severe Thunderstorm Warning	SLC	Juab, Tooele, Utah	81 min
Aug 18, 1:39 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane, Washington	3 hr
Aug 18, 1:57 PM MDT	Areal Flood Advisory	SLC	Salt Lake, Utah	2 hr
Aug 18, 2:27 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Utah	3 hr
Aug 18, 2:37 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Utah	113 min
Aug 18, 2:51 PM MDT	Special Weather Statement	SLC	Summit	24 min
Aug 18, 2:56 PM MDT	Special Weather Statement	SLC	Garfield	49 min
Aug 18, 3:14 PM MDT	Special Weather Statement	SLC	Kane	46 min
Aug 18, 3:18 PM MDT	Special Weather Statement	SLC	Wasatch	27 min
Aug 18, 3:25 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Utah	3 hr
Aug 18, 3:41 PM MDT	Special Weather Statement	SLC	Sanpete	49 min
Aug 18, 3:46 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Emery, Wayne	3 hr
Aug 18, 4:16 PM MDT	Special Weather Statement	SLC	Kane	44 min
Aug 18, 4:22 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield	3 hr
Aug 18, 5:41 PM MDT	Special Weather Statement	SLC		49 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.