Alert archive / Utah / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 83, NWS Salt Lake City, UT

August 18, 2021Tooele County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 18, 2021, 11:05 AM MDT for Tooele County, Utah. It was in force for 40 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, 11:05 AM MDT (17:05 UTC)
Expired: Aug 18, 2021, 11:45 AM MDT
In force: 40 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Tooele County, UT

The radar

The Salt Lake City radar (KMTX), 123 km from the middle of the area, began a volume at 17:04 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 5.1 hours before the alert went out and 78 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.

605 
WUUS55 KSLC 181705
SVRSLC
UTC045-181745-
/O.NEW.KSLC.SV.W.0083.210818T1705Z-210818T1745Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
1105 AM MDT Wed Aug 18 2021

The National Weather Service in Salt Lake City has issued a

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

* Until 1145 AM MDT

* At 1105 AM MDT, a severe thunderstorm was located 9 miles southeast
  of Dugway English Village, moving northeast at 30 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Vernon, Ophir, Tooele Army Depot South, Stockton, Rush Valley,
  Faust and Lofgreen.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4030 11267 4053 11223 4034 11217 4033 11220
      4026 11219 4021 11215 4015 11217 4010 11215
      4001 11219 3994 11227 3995 11233 3991 11234
      3991 11286
TIME...MOT...LOC 1705Z 243DEG 24KT 4018 11260 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Church

2 follow-up statements

671 
WWUS55 KSLC 181725
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
1125 AM MDT Wed Aug 18 2021

UTC045-181745-
/O.CON.KSLC.SV.W.0083.000000T0000Z-210818T1745Z/
Tooele UT-
1125 AM MDT Wed Aug 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 AM MDT
FOR SOUTHEASTERN TOOELE COUNTY...

At 1124 AM MDT, a severe thunderstorm was located 7 miles southwest
of Tooele Army Depot South, or 15 miles east of Dugway English
Village, moving northeast at 30 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Vernon, Ophir, Tooele Army Depot South, Stockton, Rush Valley, Faust
and Lofgreen.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4036 11255 4053 11223 4034 11217 4033 11220
      4026 11219 4021 11215 4015 11217 4010 11215
      4001 11220 4000 11220 3999 11276
TIME...MOT...LOC 1724Z 243DEG 24KT 4024 11245 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Church

323 
WWUS55 KSLC 181743
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
1143 AM MDT Wed Aug 18 2021

UTC045-181752-
/O.EXP.KSLC.SV.W.0083.000000T0000Z-210818T1745Z/
Tooele UT-
1143 AM MDT Wed Aug 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN TOOELE COUNTY
WILL EXPIRE AT 1145 AM 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 gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 4036 11255 4053 11223 4034 11217 4033 11220
      4026 11219 4021 11215 4015 11217 4010 11215
      4001 11220 4000 11220 3999 11276
TIME...MOT...LOC 1742Z 243DEG 24KT 4029 11232 

$$

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, 11:45 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, 12:34 PM MDT	Severe Thunderstorm Warning	SLC	Juab, Tooele	56 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.