Alert archive / Utah / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 30, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 24, 2021, 3:16 PM MDT for Washington County, Utah. It was in force for 29 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 24, 2021, 3:16 PM MDT (21:16 UTC)
- Expired
- Jul 24, 2021, 3:45 PM MDT
- In force
- 29 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Washington County, UT
The radar
The Cedar City radar (KICX), 60 km from the middle of the area, began a volume at 21:20 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, 9.3 hours before the alert went out and 213 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
- 335 J/kg
- Mixed-layer CIN
- -191 J/kg
- Mixed-layer LCL
- 2063 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
840
WUUS55 KSLC 242116
SVRSLC
UTC053-242145-
/O.NEW.KSLC.SV.W.0030.210724T2116Z-210724T2145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
316 PM MDT Sat Jul 24 2021
The National Weather Service in Salt Lake City has issued a
* Severe Thunderstorm Warning for...
Central Washington County in southwestern Utah...
* Until 345 PM MDT
* At 315 PM MDT, a severe thunderstorm was located 11 miles
southwest of New Harmony, or 28 miles west of Zion National Park,
and is nearly stationary.
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...
Washington, Hurricane, New Harmony, Quail Creek State Park, Ivins,
Toquerville, Leeds, Pine Valley and Snow Canyon State Park.
This includes the following highways...
Interstate 15 between mile markers 18 and 25.
Utah Route 18 between mile markers 9 and 15.
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 3717 11335 3719 11367 3752 11360 3750 11326
TIME...MOT...LOC 2115Z 183DEG 7KT 3736 11345
HAIL...1.00IN
WIND...60MPH
$$
ND1 follow-up statement
088
WWUS55 KSLC 242131
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
331 PM MDT Sat Jul 24 2021
UTC053-242145-
/O.CON.KSLC.SV.W.0030.000000T0000Z-210724T2145Z/
Washington UT-
331 PM MDT Sat Jul 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM MDT
FOR CENTRAL WASHINGTON COUNTY...
At 331 PM MDT, a severe thunderstorm was located 9 miles southwest of
New Harmony, or 28 miles southwest of Cedar City, moving north at 10
mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Washington, Hurricane, New Harmony, Quail Creek State Park, Ivins,
Toquerville, Leeds, Pine Valley and Snow Canyon State Park.
This includes the following highways...
Interstate 15 between mile markers 18 and 25.
Utah Route 18 between mile markers 9 and 15.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3717 11335 3719 11367 3752 11360 3750 11326
TIME...MOT...LOC 2131Z 183DEG 7KT 3739 11345
HAIL...1.00IN
WIND...60MPH
$$
NDThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 6:14 PM MDT | Areal Flood Advisory | SLC | Washington | 61 min |
| Jul 24, 3:23 AM MDT | Flash Flood Watch | SLC | Beaver, Garfield, Iron, Kane, Piute, Washington and 1 more | 42 hr |
| Jul 24, 12:56 PM MDT | Flash Flood Warning | SLC | Kane | 3 hr |
| Jul 24, 12:58 PM MDT | Special Weather Statement | SLC | Kane | 32 min |
| Jul 24, 1:34 PM MDT | Flash Flood Warning | SLC | Garfield, Kane | 4 hr |
| Jul 24, 2:13 PM MDT | Flash Flood Warning | SLC | Washington | 3 hr |
| Jul 24, 2:24 PM MDT | Severe Thunderstorm Warning | SLC | Washington | 21 min |
| Jul 24, 3:40 PM MDT | Severe Thunderstorm Warning | SLC | Iron, Washington | 35 min |
| Jul 24, 4:04 PM MDT | Severe Thunderstorm Warning | SLC | Washington | 26 min |
| Jul 24, 4:07 PM MDT | Flash Flood Warning | SLC | Kane, Washington | 3 hr |
| Jul 24, 4:12 PM MDT | Flash Flood Warning | SLC | Iron, Washington | 3 hr |
| Jul 24, 4:30 PM MDT | Severe Thunderstorm Warning | SLC | Washington | 30 min |
| Jul 24, 5:24 PM MDT | Flash Flood Warning | SLC | Washington | 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.