Alert archive / Utah / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 102, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 10, 2021, 5:04 PM MDT for Box Elder County, Utah. It was in force for 26 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 10, 2021, 5:04 PM MDT (23:04 UTC)
- Expired
- Sep 10, 2021, 5:30 PM MDT
- In force
- 26 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Box Elder County, UT
The radar
The Salt Lake City radar (KMTX), 83 km from the middle of the area, began a volume at 23:04 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, 11.1 hours before the alert went out and 128 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
- 3 J/kg
- Mixed-layer CIN
- -243 J/kg
- Mixed-layer LCL
- 2286 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -85 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
235 WUUS55 KSLC 102304 SVRSLC UTC003-102330- /O.NEW.KSLC.SV.W.0102.210910T2304Z-210910T2330Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Salt Lake City UT 504 PM MDT Fri Sep 10 2021 The National Weather Service in Salt Lake City has issued a * Severe Thunderstorm Warning for... Northwestern Box Elder County in northern Utah... * Until 530 PM MDT * At 504 PM MDT, severe thunderstorms were located along a line extending from 9 miles northwest of Park Valley to 32 miles south of Almo, moving northeast at 35 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Park Valley, Curlew Junction, Rosette, Yost and Standrod. This includes Utah Route 30 between mile markers 30 and 81. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4160 11296 4156 11361 4199 11356 4199 11293 TIME...MOT...LOC 2304Z 224DEG 30KT 4190 11347 4163 11354 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Webber
2 follow-up statements
757 WWUS55 KSLC 102316 SVSSLC Severe Weather Statement National Weather Service Salt Lake City UT 516 PM MDT Fri Sep 10 2021 UTC003-102330- /O.CON.KSLC.SV.W.0102.000000T0000Z-210910T2330Z/ Box Elder UT- 516 PM MDT Fri Sep 10 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MDT FOR NORTH CENTRAL BOX ELDER COUNTY... At 516 PM MDT, severe thunderstorms were located along a line extending from 10 miles north of Park Valley to 29 miles south of Almo, moving east at 35 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Park Valley, Curlew Junction, Rosette, Yost and Standrod. This includes Utah Route 30 between mile markers 44 and 81. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4162 11297 4168 11350 4199 11356 4199 11293 TIME...MOT...LOC 2316Z 270DEG 30KT 4196 11340 4169 11347 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Webber
279
WWUS55 KSLC 102329
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
529 PM MDT Fri Sep 10 2021
UTC003-102339-
/O.EXP.KSLC.SV.W.0102.000000T0000Z-210910T2330Z/
Box Elder UT-
529 PM MDT Fri Sep 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL BOX ELDER COUNTY
WILL EXPIRE AT 530 PM MDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
LAT...LON 4162 11297 4168 11350 4199 11356 4199 11293
TIME...MOT...LOC 2329Z 270DEG 30KT 4200 11334 4174 11341
$$
WebberThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 10, 7:25 AM MDT | Special Weather Statement | SLC | Iron | 50 min |
| Sep 10, 1:38 PM MDT | Special Weather Statement | SLC | Sanpete | 52 min |
| Sep 10, 2:04 PM MDT | Special Weather Statement | SLC | Salt Lake | 41 min |
| Sep 10, 2:07 PM MDT | Special Weather Statement | SLC | Sevier | 38 min |
| Sep 10, 2:23 PM MDT | Severe Thunderstorm Warning | SLC | Davis, Morgan, Salt Lake, Weber | 37 min |
| Sep 10, 3:56 PM MDT | Special Weather Statement | SLC | Summit | 49 min |
| Sep 10, 4:29 PM MDT | Special Weather Statement | SLC | Tooele | 61 min |
| Sep 10, 4:38 PM MDT | Special Weather Statement | SLC | Rich | 52 min |
| Sep 10, 4:41 PM MDT | Special Weather Statement | SLC | Box Elder | 64 min |
| Sep 10, 5:51 PM MDT | Special Weather Statement | SLC | Davis | 54 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.