Alert archive / Utah / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 62, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 13, 2021, 4:20 PM MDT for Iron County, Washington 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
- Aug 13, 2021, 4:20 PM MDT (22:20 UTC)
- Expired
- Aug 13, 2021, 4:45 PM MDT
- In force
- 25 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Iron County, UT, Washington County, UT
The radar
The Cedar City radar (KICX), 43 km from the middle of the area, began a volume at 22:22 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
Las Vegas, NV (KVEF), launched 12:00Z, 10.3 hours before the alert went out and 233 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
- 487 J/kg
- Mixed-layer CIN
- -323 J/kg
- Mixed-layer LCL
- 2453 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 80 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
059 WUUS55 KSLC 132220 SVRSLC UTC021-053-132245- /O.NEW.KSLC.SV.W.0062.210813T2220Z-210813T2245Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Salt Lake City UT 420 PM MDT Fri Aug 13 2021 The National Weather Service in Salt Lake City has issued a * Severe Thunderstorm Warning for... North central Washington County in southwestern Utah... South central Iron County in southern Utah... * Until 445 PM MDT * At 419 PM MDT, a severe thunderstorm was located near New Harmony, or 16 miles southwest of Cedar City, and is nearly stationary. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. * Locations impacted include... New Harmony, Kanarraville and Kolob Canyon. This includes the following highways... Interstate 15 between mile markers 40 and 48. Utah Route 56 between mile markers 43 and 46. 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 3756 11347 3764 11333 3752 11311 3738 11335 TIME...MOT...LOC 2219Z 322DEG 4KT 3754 11332 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...<50 MPH $$ AD
2 follow-up statements
065 WWUS55 KSLC 132235 SVSSLC Severe Weather Statement National Weather Service Salt Lake City UT 435 PM MDT Fri Aug 13 2021 UTC021-053-132245- /O.CON.KSLC.SV.W.0062.000000T0000Z-210813T2245Z/ Washington UT-Iron UT- 435 PM MDT Fri Aug 13 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM MDT FOR NORTH CENTRAL WASHINGTON AND SOUTH CENTRAL IRON COUNTIES... At 434 PM MDT, a severe thunderstorm was located near New Harmony, or 16 miles southwest of Cedar City, and is nearly stationary. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. Locations impacted include... New Harmony, Kanarraville and Kolob Canyon. This includes the following highways... Interstate 15 between mile markers 40 and 48. Utah Route 56 between mile markers 43 and 46. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3756 11347 3764 11333 3752 11311 3738 11335 TIME...MOT...LOC 2234Z 322DEG 4KT 3753 11331 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...<50 MPH $$ AD
688
WWUS55 KSLC 132242
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
442 PM MDT Fri Aug 13 2021
UTC021-053-132251-
/O.EXP.KSLC.SV.W.0062.000000T0000Z-210813T2245Z/
Washington UT-Iron UT-
442 PM MDT Fri Aug 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL WASHINGTON AND
SOUTH CENTRAL IRON COUNTIES WILL EXPIRE AT 445 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 heavy rain
is still possible with this thunderstorm.
LAT...LON 3756 11347 3764 11333 3752 11311 3738 11335
TIME...MOT...LOC 2241Z 322DEG 4KT 3752 11330
$$
ADThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 6:26 PM MDT | Flash Flood Warning | SLC | Washington | 114 min |
| Aug 13, 4:40 PM MDT | Severe Thunderstorm Warning | SLC | Washington | 35 min |
| Aug 13, 5:14 PM MDT | Severe Thunderstorm Warning | SLC | Washington | 16 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.