Alert archive / Utah / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 28, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 22, 2021, 8:29 PM MDT for Davis County, Salt Lake County, Tooele County, Utah. It was in force for 31 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
- Jul 22, 2021, 8:29 PM MDT (02:29 UTC)
- Expired
- Jul 22, 2021, 9:00 PM MDT
- In force
- 31 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 70.0 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 02:33 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, 2.5 hours before the alert went out and 20 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
- 775 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 2884 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 14 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
579
WUUS55 KSLC 230229
SVRSLC
UTC011-035-045-230300-
/O.NEW.KSLC.SV.W.0028.210723T0229Z-210723T0300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
829 PM MDT Thu Jul 22 2021
The National Weather Service in Salt Lake City has issued a
* Severe Thunderstorm Warning for...
Northwestern Salt Lake County in northern Utah...
Southern Davis County in northern Utah...
East central Tooele County in northern Utah...
* Until 900 PM MDT
* At 828 PM MDT, a severe thunderstorm was located near Salt Lake
City International Airport, or 8 miles west of Bountiful, moving
east at 20 mph. 70 mph winds have been reported in this
thunderstorm.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Locations impacted include...
Salt Lake City, West Valley City, Layton, Bountiful, Farmington,
Kaysville, North Salt Lake, Centerville, Woods Cross, West
Bountiful, Salt Lake City International Airport, Magna, Great Salt
Lake South of the Causeway, Lake Point and Antelope Island State
Park.
This includes the following highways...
Interstate 15 between mile markers 308 and 322, and between mile
markers 325 and 329.
Interstate 80 in Utah between mile markers 97 and 119.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
If on or near the Great Salt Lake, get away from the water and move
indoors or inside a vehicle. Remember, lightning can strike out to
15 miles from the parent thunderstorm. If you can hear thunder, you
are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.
&&
LAT...LON 4063 11226 4088 11241 4106 11194 4080 11181
TIME...MOT...LOC 0228Z 251DEG 15KT 4085 11203
HAIL...<.75IN
WIND...70MPH
$$
ND2 follow-up statements
447
WWUS55 KSLC 230244
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
844 PM MDT Thu Jul 22 2021
UTC011-035-045-230300-
/O.CON.KSLC.SV.W.0028.000000T0000Z-210723T0300Z/
Salt Lake UT-Davis UT-Tooele UT-
844 PM MDT Thu Jul 22 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM MDT
FOR NORTHWESTERN SALT LAKE...SOUTHERN DAVIS AND EAST CENTRAL TOOELE
COUNTIES...
At 843 PM MDT, a severe thunderstorm was located over Woods Cross, or
near Bountiful, moving east at 15 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Salt Lake City, West Valley City, Layton, Bountiful, Farmington,
Kaysville, North Salt Lake, Centerville, Woods Cross, West Bountiful,
Salt Lake City International Airport, Magna, Great Salt Lake South of
the Causeway, Lake Point and Antelope Island State Park.
This includes the following highways...
Interstate 15 between mile markers 308 and 322, and between mile
markers 325 and 329.
Interstate 80 in Utah between mile markers 97 and 119.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
If on or near the Great Salt Lake, get away from the water and move
indoors or inside a vehicle. remember, lightning can strike out to
15 miles from the parent thunderstorm. If you can hear thunder, you
are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.
&&
LAT...LON 4063 11226 4088 11241 4106 11194 4080 11181
TIME...MOT...LOC 0243Z 251DEG 15KT 4087 11195
HAIL...<.75IN
WIND...70MPH
$$
ND559
WWUS55 KSLC 230256
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
856 PM MDT Thu Jul 22 2021
UTC011-035-045-230306-
/O.EXP.KSLC.SV.W.0028.000000T0000Z-210723T0300Z/
Salt Lake UT-Davis UT-Tooele UT-
856 PM MDT Thu Jul 22 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SALT LAKE...
SOUTHERN DAVIS AND EAST CENTRAL TOOELE COUNTIES WILL EXPIRE AT 900 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 4063 11226 4088 11241 4106 11194 4080 11181
TIME...MOT...LOC 0256Z 251DEG 15KT 4089 11189
$$
NDThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 6:01 PM MDT | Special Weather Statement | SLC | Tooele | 44 min |
| Jul 22, 6:47 PM MDT | Special Weather Statement | SLC | Utah | 43 min |
| Jul 22, 6:53 PM MDT | Areal Flood Advisory | SLC | Salt Lake | 112 min |
| Jul 22, 7:03 PM MDT | Special Weather Statement | SLC | Davis | 42 min |
| Jul 22, 7:07 PM MDT | Severe Thunderstorm Warning | SLC | Salt Lake, Utah | 23 min |
| Jul 22, 7:21 PM MDT | Severe Thunderstorm Warning | SLC | Davis, Morgan, Salt Lake, Summit | 24 min |
| Jul 22, 7:23 PM MDT | Flash Flood Warning | SLC | Utah | 82 min |
| Jul 22, 7:30 PM MDT | Special Weather Statement | SLC | Salt Lake | 30 min |
| Jul 22, 7:37 PM MDT | Areal Flood Advisory | SLC | Utah | 105 min |
| Jul 22, 7:44 PM MDT | Special Weather Statement | SLC | Salt Lake | 46 min |
| Jul 22, 7:52 PM MDT | Areal Flood Advisory | SLC | Salt Lake | 86 min |
| Jul 22, 8:01 PM MDT | Special Weather Statement | SLC | Morgan | 29 min |
| Jul 22, 8:11 PM MDT | Special Weather Statement | SLC | Davis | 49 min |
| Jul 22, 8:56 PM MDT | Special Weather Statement | SLC | Morgan, Salt Lake, Weber | 49 min |
| Jul 23, 3:20 AM MDT | Flash Flood Watch | SLC | Beaver, Garfield, Iron, Kane, Piute, Washington and 1 more | 21 hr |
| Jul 23, 2:34 PM MDT | Flash Flood Warning | SLC | Kane | 3 hr |
| Jul 23, 3:14 PM MDT | Special Weather Statement | SLC | Iron | 46 min |
| Jul 23, 3:27 PM MDT | Special Weather Statement | SLC | Box Elder | 33 min |
| Jul 23, 4:04 PM MDT | Special Weather Statement | SLC | Cache | 26 min |
| Jul 23, 4:35 PM MDT | Special Weather Statement | SLC | Cache | 25 min |
| Jul 23, 5:03 PM MDT | Special Weather Statement | SLC | Cache | 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.