Alert archive / Utah / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 66, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 14, 2021, 7:01 PM MDT for Washington County, Utah. It was in force for 33 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 14, 2021, 7:01 PM MDT (01:01 UTC)
- Expired
- Aug 14, 2021, 7:34 PM MDT
- In force
- 33 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), 83 km from the middle of the area, began a volume at 01:04 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 14, 7:12 PM MDT | HAIL 1 | St George, UT | VIEWER VIDEO SUBMITTED TO NEWS MEDIA WITH NICKEL AND QUARTER SIZED HAIL REPORTED. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Las Vegas, NV (KVEF), launched 00:00Z, 1.0 hours before the alert went out and 194 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
- 1122 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 3058 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -26 m²/s²
- 0-3 km storm-relative helicity
- 94 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
695
WUUS55 KSLC 150101
SVRSLC
UTC053-150145-
/O.NEW.KSLC.SV.W.0066.210815T0101Z-210815T0145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
701 PM MDT Sat Aug 14 2021
The National Weather Service in Salt Lake City has issued a
* Severe Thunderstorm Warning for...
South central Washington County in southwestern Utah...
* Until 745 PM MDT
* At 701 PM MDT, a severe thunderstorm was located over St George, or
20 miles northeast of Virgin River Gorge, moving southwest 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...
St George, Washington, Santa Clara and Bloomington.
This includes the following highways...
Interstate 15 between mile markers 3 and 15.
Utah Route 18 between mile markers 0 and 5.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3712 11368 3722 11350 3708 11339 3700 11350
3700 11358
TIME...MOT...LOC 0101Z 054DEG 8KT 3709 11352
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Woodward2 follow-up statements
515
WWUS55 KSLC 150125
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
725 PM MDT Sat Aug 14 2021
UTC053-150145-
/O.CON.KSLC.SV.W.0066.000000T0000Z-210815T0145Z/
Washington UT-
725 PM MDT Sat Aug 14 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM MDT
FOR SOUTH CENTRAL WASHINGTON COUNTY...
At 725 PM MDT, a severe thunderstorm was located over St George, or
16 miles northeast of Virgin River Gorge, moving southwest at 10 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
St George, Washington, Santa Clara and Bloomington.
This includes the following highways...
Interstate 15 between mile markers 3 and 10.
Utah Route 18 between mile markers 0 and 5.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3711 11367 3715 11362 3718 11357 3704 11345
3700 11350 3700 11358
TIME...MOT...LOC 0125Z 054DEG 8KT 3706 11358
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Woodward732
WWUS55 KSLC 150134
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
734 PM MDT Sat Aug 14 2021
UTC053-150143-
/O.CAN.KSLC.SV.W.0066.000000T0000Z-210815T0145Z/
Washington UT-
734 PM MDT Sat Aug 14 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL WASHINGTON
COUNTY IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.
LAT...LON 3711 11367 3715 11362 3718 11357 3704 11345
3700 11350 3700 11358
TIME...MOT...LOC 0132Z 054DEG 8KT 3705 11359
$$
WoodwardNearby
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.