Alert archive / Utah / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 101, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 10, 2021, 2:23 PM MDT for 4 counties in Utah. It was in force for 37 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, 2:23 PM MDT (20:23 UTC)
- Expired
- Sep 10, 2021, 3:00 PM MDT
- In force
- 37 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Davis County, UT, Morgan County, UT, Salt Lake County, UT, Weber County, UT
The radar
The Salt Lake City radar (KMTX), 61 km from the middle of the area, began a volume at 20:25 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, 8.4 hours before the alert went out and 40 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
- 3445 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 42 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
732
WUUS55 KSLC 102023
SVRSLC
UTC011-029-035-057-102100-
/O.NEW.KSLC.SV.W.0101.210910T2023Z-210910T2100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
223 PM MDT Fri Sep 10 2021
The National Weather Service in Salt Lake City has issued a
* Severe Thunderstorm Warning for...
Southeastern Weber County in northern Utah...
Northwestern Salt Lake County in northern Utah...
Eastern Davis County in northern Utah...
Southwestern Morgan County in northern Utah...
* Until 300 PM MDT
* At 223 PM MDT, a severe thunderstorm was located over Salt Lake
City International Airport, or 7 miles northwest of Salt Lake City,
moving northeast at 25 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, West Valley City, Layton, Bountiful, Farmington,
Morgan, Taylorsville, Kaysville, South Salt Lake, North Salt Lake,
Centerville, Woods Cross, South Weber, West Bountiful, Uintah, Salt
Lake City International Airport, Millcreek, Fruit Heights, Mountain
Green and Peterson.
This includes the following highways...
Interstate 15 between mile markers 303 and 330.
Interstate 84 between mile markers 88 and 107.
Interstate 80 in Utah between mile markers 107 and 123.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4120 11147 4067 11192 4078 11217 4114 11191
4115 11185 4118 11187 4122 11179 4118 11170
4120 11163 4124 11160 4124 11155
TIME...MOT...LOC 2023Z 212DEG 20KT 4082 11200
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CRK3 follow-up statements
156
WWUS55 KSLC 102033
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
233 PM MDT Fri Sep 10 2021
UTC011-029-035-057-102100-
/O.CON.KSLC.SV.W.0101.000000T0000Z-210910T2100Z/
Weber UT-Salt Lake UT-Davis UT-Morgan UT-
233 PM MDT Fri Sep 10 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM MDT
FOR SOUTHEASTERN WEBER...NORTH CENTRAL SALT LAKE...EASTERN DAVIS AND
SOUTHWESTERN MORGAN COUNTIES...
At 232 PM MDT, a severe thunderstorm was located over Woods Cross, or
near Bountiful, moving northeast at 25 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Salt Lake City, Layton, Bountiful, Farmington, Morgan, Kaysville,
North Salt Lake, Centerville, Woods Cross, South Weber, West
Bountiful, Uintah, Fruit Heights, Mountain Green, Portersville,
Stoddard, Peterson, Richville, East Layton and Snowbasin.
This includes the following highways...
Interstate 15 between mile markers 312 and 330.
Interstate 84 between mile markers 88 and 108.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4077 11183 4089 11209 4114 11191 4115 11185
4118 11187 4122 11179 4118 11170 4120 11163
4124 11160 4124 11155 4120 11147
TIME...MOT...LOC 2032Z 212DEG 20KT 4087 11196
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CRK119
WWUS55 KSLC 102039
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
239 PM MDT Fri Sep 10 2021
UTC035-102049-
/O.CAN.KSLC.SV.W.0101.000000T0000Z-210910T2100Z/
Salt Lake UT-
239 PM MDT Fri Sep 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL SALT LAKE COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4085 11176 4086 11189 4092 11197 4096 11203
4114 11191 4115 11185 4118 11187 4122 11179
4118 11170 4120 11163 4124 11160 4124 11155
4120 11147
TIME...MOT...LOC 2039Z 210DEG 28KT 4093 11185
$$
UTC011-029-057-102100-
/O.CON.KSLC.SV.W.0101.000000T0000Z-210910T2100Z/
Weber UT-Davis UT-Morgan UT-
239 PM MDT Fri Sep 10 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM MDT
FOR SOUTHEASTERN WEBER...NORTHEASTERN DAVIS AND SOUTHWESTERN MORGAN
COUNTIES...
At 239 PM MDT, a severe thunderstorm was located over Centerville, or
near Bountiful, moving northeast at 30 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Layton, Bountiful, Farmington, Morgan, Kaysville, Centerville, Woods
Cross, South Weber, West Bountiful, Uintah, Fruit Heights, Mountain
Green, Portersville, Stoddard, Peterson, Richville, East Layton and
Snowbasin.
This includes the following highways...
Interstate 15 between mile markers 316 and 330.
Interstate 84 between mile markers 88 and 108.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4085 11176 4086 11189 4092 11197 4096 11203
4114 11191 4115 11185 4118 11187 4122 11179
4118 11170 4120 11163 4124 11160 4124 11155
4120 11147
TIME...MOT...LOC 2039Z 210DEG 28KT 4093 11185
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CRK950
WWUS55 KSLC 102051
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
251 PM MDT Fri Sep 10 2021
UTC011-029-057-102100-
/O.EXP.KSLC.SV.W.0101.000000T0000Z-210910T2100Z/
Weber UT-Davis UT-Morgan UT-
251 PM MDT Fri Sep 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WEBER...
NORTHEASTERN DAVIS AND SOUTHWESTERN MORGAN COUNTIES WILL EXPIRE AT
300 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 gusty
winds are still possible with this thunderstorm.
LAT...LON 4085 11176 4086 11189 4092 11197 4096 11203
4114 11191 4115 11185 4118 11187 4122 11179
4118 11170 4120 11163 4124 11160 4124 11155
4120 11147
TIME...MOT...LOC 2050Z 212DEG 20KT 4097 11182
$$
CRKThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 10, 7:25 AM MDT | Special Weather Statement | SLC | Iron | 50 min |
| Sep 10, 1:38 PM MDT | Special Weather Statement | SLC | Sanpete | 52 min |
| Sep 10, 2:04 PM MDT | Special Weather Statement | SLC | Salt Lake | 41 min |
| Sep 10, 2:07 PM MDT | Special Weather Statement | SLC | Sevier | 38 min |
| Sep 10, 3:56 PM MDT | Special Weather Statement | SLC | Summit | 49 min |
| Sep 10, 4:29 PM MDT | Special Weather Statement | SLC | Tooele | 61 min |
| Sep 10, 4:38 PM MDT | Special Weather Statement | SLC | Rich | 52 min |
| Sep 10, 4:41 PM MDT | Special Weather Statement | SLC | Box Elder | 64 min |
| Sep 10, 5:04 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 26 min |
| Sep 10, 5:51 PM MDT | Special Weather Statement | SLC | Davis | 54 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.