Alert archive / Utah / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 105, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 10, 2021, 6:50 PM MDT for Davis County, Salt Lake County, Tooele County, Utah. It was in force for 25 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
- Sep 10, 2021, 6:50 PM MDT (00:50 UTC)
- Expired
- Sep 10, 2021, 7:15 PM MDT
- In force
- 25 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Davis County, UT, Salt Lake County, UT, Tooele County, UT
The radar
The Salt Lake City radar (KMTX), 58 km from the middle of the area, began a volume at 00:51 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 00:00Z, 0.8 hours before the alert went out and 15 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
- 430 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 3241 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 128 m²/s²
- 0-3 km storm-relative helicity
- 161 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.2
The text
As transmitted.
263
WUUS55 KSLC 110050
SVRSLC
UTC011-035-045-110115-
/O.NEW.KSLC.SV.W.0105.210911T0050Z-210911T0115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
650 PM MDT Fri Sep 10 2021
The National Weather Service in Salt Lake City has issued a
* Severe Thunderstorm Warning for...
Northwestern Salt Lake County in northern Utah...
Central Davis County in northern Utah...
Northeastern Tooele County in northern Utah...
* Until 715 PM MDT
* At 649 PM MDT, a severe thunderstorm was located 7 miles northwest
of Magna, or 11 miles northwest of West Valley City, moving
northeast at 35 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Salt Lake City, Layton, Bountiful, Farmington, Clearfield,
Kaysville, Syracuse, North Salt Lake, Centerville, Woods Cross,
West Bountiful, Salt Lake City International Airport, Fruit Heights
and Antelope Island State Park.
This includes the following highways...
Interstate 15 between mile markers 312 and 333.
Interstate 80 in Utah between mile markers 102 and 113.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4097 11178 4096 11182 4090 11177 4088 11177
4070 11219 4080 11234 4111 11202
TIME...MOT...LOC 0049Z 229DEG 32KT 4079 11219
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Webber2 follow-up statements
755
WWUS55 KSLC 110105
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
705 PM MDT Fri Sep 10 2021
UTC011-035-045-110115-
/O.CON.KSLC.SV.W.0105.000000T0000Z-210911T0115Z/
Salt Lake UT-Davis UT-Tooele UT-
705 PM MDT Fri Sep 10 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM MDT
FOR NORTHWESTERN SALT LAKE...CENTRAL DAVIS AND NORTHEASTERN TOOELE
COUNTIES...
At 705 PM MDT, a severe thunderstorm was located 7 miles west of West
Bountiful, or 9 miles west of Bountiful, moving northeast at 35 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Salt Lake City, Layton, Bountiful, Farmington, Clearfield, Kaysville,
Syracuse, North Salt Lake, Centerville, Woods Cross, West Bountiful,
Salt Lake City International Airport, Fruit Heights and Antelope
Island State Park.
This includes the following highways...
Interstate 15 between mile markers 312 and 333.
Interstate 80 in Utah between mile markers 102 and 113.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4097 11178 4096 11182 4090 11177 4088 11177
4070 11219 4080 11234 4111 11202
TIME...MOT...LOC 0105Z 229DEG 32KT 4089 11204
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Webber978
WWUS55 KSLC 110113
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
713 PM MDT Fri Sep 10 2021
UTC011-035-045-110122-
/O.EXP.KSLC.SV.W.0105.000000T0000Z-210911T0115Z/
Salt Lake UT-Davis UT-Tooele UT-
713 PM MDT Fri Sep 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SALT LAKE...
CENTRAL DAVIS AND NORTHEASTERN TOOELE COUNTIES WILL EXPIRE AT 715 PM
MDT...
The storm which prompted the warning has moved out of the area. A
new warning has been issued for the storm.
LAT...LON 4097 11178 4096 11182 4090 11177 4088 11177
4070 11219 4080 11234 4111 11202
TIME...MOT...LOC 0112Z 229DEG 32KT 4093 11198
$$
WebberThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 10, 6:06 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder, Weber | 39 min |
| Sep 10, 6:20 PM MDT | Severe Thunderstorm Warning | SLC | Davis, Morgan, Weber | 25 min |
| Sep 10, 6:42 PM MDT | Special Weather Statement | SLC | Morgan, Weber | 33 min |
| Sep 10, 6:42 PM MDT | Special Weather Statement | SLC | Davis | 33 min |
| Sep 10, 7:10 PM MDT | Special Weather Statement | SLC | Salt Lake, Utah | 50 min |
| Sep 10, 7:10 PM MDT | Severe Thunderstorm Warning | SLC | Davis, Morgan, Salt Lake, Weber | 35 min |
| Sep 10, 7:16 PM MDT | Severe Thunderstorm Warning | SLC | Davis, Salt Lake | 29 min |
| Sep 10, 7:24 PM MDT | Special Weather Statement | SLC | Rich | 51 min |
| Sep 10, 7:24 PM MDT | Special Weather Statement | SLC | Cache | 51 min |
| Sep 10, 7:38 PM MDT | Special Weather Statement | SLC | Cache, Morgan, Rich, Weber | 52 min |
| Sep 11, 12:50 PM MDT | Flash Flood Warning | SLC | Wayne | 3 hr |
| Sep 11, 12:54 PM MDT | Special Weather Statement | SLC | Carbon | 51 min |
| Sep 11, 1:39 PM MDT | Special Weather Statement | SLC | Duchesne | 51 min |
| Sep 11, 1:40 PM MDT | Flash Flood Warning | SLC | Carbon | 3 hr |
| Sep 11, 3:17 PM MDT | Special Weather Statement | SLC | Duchesne | 43 min |
| Sep 11, 4:25 PM MDT | Special Weather Statement | SLC | Millard | 35 min |
| Sep 11, 5:10 PM MDT | Special Weather Statement | SLC | Juab | 35 min |
| Sep 11, 5:19 PM MDT | Special Weather Statement | SLC | Millard | 26 min |
| Sep 11, 5:44 PM MDT | Special Weather Statement | SLC | Millard | 46 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.