Alert archive / Utah / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 27, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 22, 2021, 7:21 PM MDT for 4 counties in Utah. It was in force for 24 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, 7:21 PM MDT (01:21 UTC)
- Expired
- Jul 22, 2021, 7:45 PM MDT
- In force
- 24 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Davis County, UT, Morgan County, UT, Salt Lake County, UT, Summit County, UT
The radar
The Salt Lake City radar (KMTX), 72 km from the middle of the area, began a volume at 01:19 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, 1.4 hours before the alert went out and 4 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.
738
WUUS55 KSLC 230121
SVRSLC
UTC011-029-035-043-230145-
/O.NEW.KSLC.SV.W.0027.210723T0121Z-210723T0145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
721 PM MDT Thu Jul 22 2021
The National Weather Service in Salt Lake City has issued a
* Severe Thunderstorm Warning for...
Northeastern Salt Lake County in northern Utah...
Southeastern Davis County in northern Utah...
South central Morgan County in northern Utah...
Western Summit County in northern Utah...
* Until 745 PM MDT
* At 720 PM MDT, a severe thunderstorm was located near Salt Lake
City, moving northeast at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Salt Lake City, Bountiful, North Salt Lake, Woods Cross, Summit
Park, Emigration Canyon, Salt Lake City International Airport,
University Of Utah and Sugarhouse.
This includes the following highways...
Interstate 15 between mile markers 306 and 316.
Interstate 80 in Utah between mile markers 114 and 119, and between
mile markers 131 and 138.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4074 11202 4088 11199 4087 11161 4072 11164
TIME...MOT...LOC 0120Z 227DEG 11KT 4076 11192
HAIL...1.00IN
WIND...60MPH
$$
ND2 follow-up statements
772
WWUS55 KSLC 230131
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
731 PM MDT Thu Jul 22 2021
UTC011-029-035-043-230145-
/O.CON.KSLC.SV.W.0027.000000T0000Z-210723T0145Z/
Salt Lake UT-Davis UT-Morgan UT-Summit UT-
731 PM MDT Thu Jul 22 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM MDT
FOR NORTHEASTERN SALT LAKE...SOUTHEASTERN DAVIS...SOUTH CENTRAL
MORGAN AND WESTERN SUMMIT COUNTIES...
At 731 PM MDT, a severe thunderstorm was located over Salt Lake City,
moving northeast at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Salt Lake City, Bountiful, North Salt Lake, Woods Cross, Summit Park,
Emigration Canyon, Salt Lake City International Airport, University
Of Utah and Sugarhouse.
This includes the following highways...
Interstate 15 between mile markers 306 and 316.
Interstate 80 in Utah between mile markers 117 and 119, and between
mile markers 131 and 138.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4074 11196 4088 11193 4087 11161 4072 11164
TIME...MOT...LOC 0131Z 227DEG 11KT 4078 11189
HAIL...1.00IN
WIND...60MPH
$$
ND493
WWUS55 KSLC 230143
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
743 PM MDT Thu Jul 22 2021
UTC011-029-035-043-230153-
/O.EXP.KSLC.SV.W.0027.000000T0000Z-210723T0145Z/
Salt Lake UT-Davis UT-Morgan UT-Summit UT-
743 PM MDT Thu Jul 22 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SALT LAKE...
SOUTHEASTERN DAVIS...SOUTH CENTRAL MORGAN AND WESTERN SUMMIT COUNTIES
WILL EXPIRE AT 745 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 and heavy rain are still possible with this thunderstorm.
LAT...LON 4074 11196 4088 11193 4087 11161 4072 11164
TIME...MOT...LOC 0143Z 227DEG 11KT 4080 11186
$$
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, 7:23 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, 8:29 PM MDT | Severe Thunderstorm Warning | SLC | Davis, Salt Lake, Tooele | 31 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.