Alert archive / Utah / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 108, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 12, 2021, 3:37 PM MDT for Box Elder County, Utah. It was in force for 23 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, 3:37 PM MDT (21:37 UTC)
- Expired
- Sep 12, 2021, 4:00 PM MDT
- In force
- 23 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), 108 km from the middle of the area, began a volume at 21:36 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, 9.6 hours before the alert went out and 76 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.
407
WUUS55 KSLC 122137
SVRSLC
UTC003-122200-
/O.NEW.KSLC.SV.W.0108.210912T2137Z-210912T2200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
337 PM MDT Sun Sep 12 2021
The National Weather Service in Salt Lake City has issued a
* Severe Thunderstorm Warning for...
West central Box Elder County in northern Utah...
* Until 400 PM MDT
* At 336 PM MDT, a severe thunderstorm was located 16 miles northeast
of Montello, 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...
Lucin.
This includes Utah Route 30 between mile markers 0 and 31.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4164 11343 4135 11331 4124 11404 4137 11405
4142 11404
TIME...MOT...LOC 2136Z 250DEG 27KT 4137 11391
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CRK1 follow-up statement
779
WWUS55 KSLC 122147
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
347 PM MDT Sun Sep 12 2021
UTC003-122200-
/O.CON.KSLC.SV.W.0108.000000T0000Z-210912T2200Z/
Box Elder UT-
347 PM MDT Sun Sep 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM MDT
FOR WEST CENTRAL BOX ELDER COUNTY...
At 346 PM MDT, a severe thunderstorm was located 21 miles northeast
of Montello, moving east at 30 mph. An additional strong
thunderstorm is approaching the Utah/Nevada border southwest of
Lucin.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Lucin.
This includes Utah Route 30 between mile markers 0 and 31.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4164 11343 4135 11331 4124 11404 4137 11405
4142 11404
TIME...MOT...LOC 2146Z 250DEG 27KT 4140 11381
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
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, 3:54 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 | |
| Sep 12, 5:54 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 51 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.