Alert archive / Utah / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 113, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 12, 2021, 5:54 PM MDT for Box Elder County, Utah. It was in force for 51 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 12, 2021, 5:54 PM MDT (23:54 UTC)
- Expired
- Sep 12, 2021, 6:45 PM MDT
- In force
- 51 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Box Elder County, UT
The radar
The Salt Lake City radar (KMTX), 101 km from the middle of the area, began a volume at 23:58 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
Elko, NV (KLKN), launched 12:00Z, 11.9 hours before the alert went out and 112 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
- 1594 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 135 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
177
WUUS55 KSLC 122354
SVRSLC
UTC003-130045-
/O.NEW.KSLC.SV.W.0113.210912T2354Z-210913T0045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
554 PM MDT Sun Sep 12 2021
The National Weather Service in Salt Lake City has issued a
* Severe Thunderstorm Warning for...
Northwestern Box Elder County in northern Utah...
* Until 645 PM MDT
* At 554 PM MDT, a severe thunderstorm was located 16 miles west of
Park Valley, or 33 miles southeast of Oakley Reservoir, moving east
at 30 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...
Park Valley and Rosette.
This includes Utah Route 30 between mile markers 37 and 65.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4167 11375 4183 11375 4185 11310 4162 11310
TIME...MOT...LOC 2354Z 269DEG 25KT 4174 11363
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CRK4 follow-up statements
213
WWUS55 KSLC 122359
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
559 PM MDT Sun Sep 12 2021
UTC003-130045-
/O.CON.KSLC.SV.W.0113.000000T0000Z-210913T0045Z/
Box Elder UT-
559 PM MDT Sun Sep 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM MDT
FOR NORTHWESTERN BOX ELDER COUNTY...
At 559 PM MDT, a severe thunderstorm was located 13 miles southwest
of Park Valley, or 34 miles southeast of Oakley Reservoir, moving
east at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Park Valley and Rosette.
This includes Utah Route 30 between mile markers 36 and 65.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4166 11367 4183 11360 4185 11310 4162 11310
TIME...MOT...LOC 2359Z 269DEG 25KT 4174 11358
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CRK068 WWUS55 KSLC 130010 SVSSLC Severe Weather Statement National Weather Service Salt Lake City UT 610 PM MDT Sun Sep 12 2021 UTC003-130045- /O.CON.KSLC.SV.W.0113.000000T0000Z-210913T0045Z/ Box Elder UT- 610 PM MDT Sun Sep 12 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM MDT FOR NORTH CENTRAL BOX ELDER COUNTY... At 610 PM MDT, a severe thunderstorm was located near Park Valley, or 37 miles south of Malta, moving east 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... Park Valley and Rosette. This includes Utah Route 30 between mile markers 41 and 65. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4172 11355 4182 11352 4185 11310 4169 11310 TIME...MOT...LOC 0010Z 261DEG 29KT 4177 11344 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ CRK
346 WWUS55 KSLC 130021 SVSSLC Severe Weather Statement National Weather Service Salt Lake City UT 621 PM MDT Sun Sep 12 2021 UTC003-130045- /O.CON.KSLC.SV.W.0113.000000T0000Z-210913T0045Z/ Box Elder UT- 621 PM MDT Sun Sep 12 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM MDT FOR NORTH CENTRAL BOX ELDER COUNTY... At 621 PM MDT, a severe thunderstorm was located over Park Valley, or 33 miles west of Snowville, moving east at 35 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Park Valley and Rosette. This includes Utah Route 30 between mile markers 50 and 65. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4176 11343 4183 11344 4185 11310 4174 11310 TIME...MOT...LOC 0021Z 257DEG 31KT 4180 11332 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ CRK
686
WWUS55 KSLC 130035
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
635 PM MDT Sun Sep 12 2021
UTC003-130045-
/O.EXP.KSLC.SV.W.0113.000000T0000Z-210913T0045Z/
Box Elder UT-
635 PM MDT Sun Sep 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL BOX ELDER COUNTY
WILL EXPIRE AT 645 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.
LAT...LON 4176 11343 4183 11344 4185 11310 4174 11310
TIME...MOT...LOC 0035Z 269DEG 25KT 4180 11321
$$
CRKThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 6:19 PM MDT | Flash Flood Warning | SLC | Emery, Garfield, Wayne | 3 hr |
| Sep 11, 6:30 PM MDT | Special Weather Statement | SLC | Juab | 45 min |
| Sep 11, 7:16 PM MDT | Special Weather Statement | SLC | Juab | 44 min |
| Sep 11, 7:24 PM MDT | Special Weather Statement | SLC | 51 min | |
| Sep 11, 8:15 PM MDT | Flash Flood Warning | SLC | Garfield, Wayne | 3 hr |
| Sep 11, 8:22 PM MDT | Special Weather Statement | SLC | Sanpete | 38 min |
| Sep 11, 9:06 PM MDT | Special Weather Statement | SLC | Sanpete | 39 min |
| Sep 12, 3:29 PM MDT | Special Weather Statement | SLC | Box Elder | 46 min |
| Sep 12, 3:37 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 23 min |
| Sep 12, 3:54 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 51 min |
| Sep 12, 4:13 PM MDT | Special Weather Statement | SLC | Box Elder | 47 min |
| Sep 12, 4:31 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 44 min |
| Sep 12, 4:42 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 24 min |
| Sep 12, 5:08 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 20 min |
| Sep 12, 5:14 PM MDT | Special Weather Statement | SLC | 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.