Alert archive / Utah / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 76, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 17, 2021, 5:12 PM MDT for Tooele County, Utah. It was in force for 63 min. 3 reports 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, 5:12 PM MDT (23:12 UTC)
- Expired
- Aug 17, 2021, 6:15 PM MDT
- In force
- 63 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Tooele County, UT
The radar
The Salt Lake City radar (KMTX), 114 km from the middle of the area, began a volume at 23:12 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, 5:15 PM MDT | TSTM WND GST 61 | 16 Wnw Dugway, UT | |
| Aug 17, 5:15 PM MDT | TSTM WND GST 62 | 12 W Dugway, UT | |
| Aug 17, 5:45 PM MDT | TSTM WND GST 78 | 14 Sw Dugway, UT |
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, 11.2 hours before the alert went out and 99 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.
- 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
The text
As transmitted.
685
WUUS55 KSLC 172312
SVRSLC
UTC045-180015-
/O.NEW.KSLC.SV.W.0076.210817T2312Z-210818T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
512 PM MDT Tue Aug 17 2021
The National Weather Service in Salt Lake City has issued a
* Severe Thunderstorm Warning for...
Southeastern Tooele County in northern Utah...
* Until 615 PM MDT
* At 511 PM MDT, severe thunderstorms were located along a line
extending from 10 miles northeast of Dugway Proving Ground Test
Range to 10 miles northwest of Fish Springs Wildlife Refuge, moving
northeast at 45 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Dugway English Village, Dugway Proving Ground Test Range and Skull
Valley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4055 11254 4024 11253 3991 11287 3991 11357
4036 11321 4054 11291
TIME...MOT...LOC 2311Z 242DEG 40KT 4027 11305 3993 11354
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS3 follow-up statements
057
WWUS55 KSLC 172334
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
534 PM MDT Tue Aug 17 2021
UTC045-180015-
/O.CON.KSLC.SV.W.0076.000000T0000Z-210818T0015Z/
Tooele UT-
534 PM MDT Tue Aug 17 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM MDT
FOR SOUTHEASTERN TOOELE COUNTY...
At 533 PM MDT, severe thunderstorms were located along a line
extending from 7 miles northwest of Dugway English Village to 11
miles north of Fish Springs Wildlife Refuge, moving northeast at 45
mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Dugway English Village, Dugway Proving Ground Test Range and Skull
Valley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 4055 11254 4024 11253 3991 11287 3991 11357
4036 11321 4054 11291
TIME...MOT...LOC 2333Z 242DEG 39KT 4032 11286 4002 11332
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS334
WWUS55 KSLC 180003
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
603 PM MDT Tue Aug 17 2021
UTC045-180015-
/O.CON.KSLC.SV.W.0076.000000T0000Z-210818T0015Z/
Tooele UT-
603 PM MDT Tue Aug 17 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM MDT
FOR SOUTHEASTERN TOOELE COUNTY...
At 602 PM MDT, severe thunderstorms were located along a line
extending from 8 miles east of Skull Valley to 12 miles southwest of
Dugway English Village, moving northeast at 45 mph.
HAZARD...70 mph wind gusts and penny size hail.
SOURCE...Radar indicated. At 545 PM a 78 mph wind gust was reported
at the Upper Camel Back Mountain mesonet site.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Dugway English Village, Dugway Proving Ground Test Range and Skull
Valley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 4055 11254 4024 11253 3991 11287 3991 11357
4036 11321 4054 11291
TIME...MOT...LOC 0002Z 240DEG 38KT 4045 11258 4016 11297
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH
$$
MPS746
WWUS55 KSLC 180013
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
613 PM MDT Tue Aug 17 2021
UTC045-180023-
/O.EXP.KSLC.SV.W.0076.000000T0000Z-210818T0015Z/
Tooele UT-
613 PM MDT Tue Aug 17 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN TOOELE COUNTY
WILL EXPIRE AT 615 PM MDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with these thunderstorms.
LAT...LON 4055 11254 4024 11253 3991 11287 3991 11357
4036 11321 4054 11291
TIME...MOT...LOC 0013Z 242DEG 40KT 4050 11246 4021 11285
$$
MPSThe 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, 2:23 PM MDT | Severe Thunderstorm Warning | SLC | Beaver, Garfield, Piute | 52 min |
| Aug 17, 2:50 PM MDT | Flash Flood Warning | 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 | SLC | Tooele | 48 min |
| Aug 17, 4:18 PM MDT | Flash Flood Warning | 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 | SLC | Millard | 66 min |
| Aug 17, 4:53 PM MDT | Flash Flood Warning | 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 | SLC | Kane | 4 hr |
| Aug 17, 5:30 PM MDT | Severe Thunderstorm Warning | SLC | Davis, Salt Lake | 45 min |
| Aug 17, 5:37 PM MDT | Flash Flood Warning | 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, 2021Every 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.