Alert archive / Utah / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 43, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 28, 2021, 3:50 PM MDT for Box Elder 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
- Jul 28, 2021, 3:50 PM MDT (21:50 UTC)
- Expired
- Jul 28, 2021, 4:15 PM MDT
- In force
- 25 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 60.0 mph
County Box Elder County, UT
The radar
The Salt Lake City radar (KMTX), 54 km from the middle of the area, began a volume at 21:52 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, 9.8 hours before the alert went out and 110 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
- 104 J/kg
- Mixed-layer CIN
- -191 J/kg
- Mixed-layer LCL
- 2082 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
995
WUUS55 KSLC 282150
SVRSLC
UTC003-282215-
/O.NEW.KSLC.SV.W.0043.210728T2150Z-210728T2215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
350 PM MDT Wed Jul 28 2021
The National Weather Service in Salt Lake City has issued a
* Severe Thunderstorm Warning for...
Northeastern Box Elder County in northern Utah...
* Until 415 PM MDT
* At 349 PM MDT, a severe thunderstorm was located 7 miles east of
Howell, or 9 miles northwest of Tremonton, and is nearly
stationary.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect
wind damage to roofs, siding, and trees.
* Locations impacted include...
Tremonton, Riverside, Garland, Bothwell and Thatcher.
This includes the following highways...
Interstate 15 between mile markers 381 and 386.
Interstate 84 between mile markers 29 and 41.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4165 11226 4170 11240 4186 11237 4179 11211
TIME...MOT...LOC 2149Z 198DEG 2KT 4174 11231
HAIL...1.50IN
WIND...60MPH
$$
Webber2 follow-up statements
007
WWUS55 KSLC 282202
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
402 PM MDT Wed Jul 28 2021
UTC003-282215-
/O.CON.KSLC.SV.W.0043.000000T0000Z-210728T2215Z/
Box Elder UT-
402 PM MDT Wed Jul 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM MDT
FOR NORTHEASTERN BOX ELDER COUNTY...
At 401 PM MDT, a severe thunderstorm was located 7 miles east of
Howell, or 10 miles northwest of Tremonton, and is nearly stationary.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Tremonton, Riverside, Garland, Bothwell and Thatcher.
This includes the following highways...
Interstate 15 between mile markers 381 and 386.
Interstate 84 between mile markers 29 and 41.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4165 11226 4170 11240 4186 11237 4179 11211
TIME...MOT...LOC 2201Z 198DEG 2KT 4175 11231
HAIL...1.50IN
WIND...60MPH
$$
AD664
WWUS55 KSLC 282214
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
414 PM MDT Wed Jul 28 2021
UTC003-282223-
/O.EXP.KSLC.SV.W.0043.000000T0000Z-210728T2215Z/
Box Elder UT-
414 PM MDT Wed Jul 28 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BOX ELDER COUNTY
WILL EXPIRE AT 415 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 4165 11226 4170 11240 4186 11237 4179 11211
TIME...MOT...LOC 2213Z 198DEG 2KT 4175 11231
$$
ADThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 11:57 AM MDT | Special Weather Statement | SLC | Cache | 48 min |
| Jul 28, 12:19 PM MDT | Flash Flood Warning | SLC | Cache | 3 hr |
| Jul 28, 1:55 PM MDT | Flash Flood Warning | SLC | Morgan | 3 hr |
| Jul 28, 2:17 PM MDT | Flash Flood Warning | SLC | Emery | 3 hr |
| Jul 28, 3:47 PM MDT | Flash Flood Warning | SLC | Davis, Morgan | 3 hr |
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.