Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 460, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Aug 19, 2021, 5:28 PM CDT for Hardeman County, Texas; Greer County, Harmon County, Jackson County, Oklahoma. It was in force for 47 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 19, 2021, 5:28 PM CDT (22:28 UTC)
- Expired
- Aug 19, 2021, 6:15 PM CDT
- In force
- 47 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Hail
- 1.0 in
- Wind
- 70.0 mph
Counties Greer County, OK, Harmon County, OK, Jackson County, OK, Hardeman County, TX
The radar
The Altus AFB radar (KFDR), 75 km from the middle of the area, began a volume at 22:30 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
Amarillo Airport, TX (KAMA), launched 12:00Z, 10.5 hours before the alert went out and 192 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
- 1123 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 988 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
752
WUUS54 KOUN 192228
SVROUN
OKC055-057-065-TXC197-192315-
/O.NEW.KOUN.SV.W.0460.210819T2228Z-210819T2315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
528 PM CDT Thu Aug 19 2021
The National Weather Service in Norman has issued a
* Severe Thunderstorm Warning for...
Central Jackson County in southwestern Oklahoma...
Southern Harmon County in southwestern Oklahoma...
Southeastern Greer County in southwestern Oklahoma...
Northwestern Hardeman County in northern Texas...
* Until 615 PM CDT.
* At 528 PM CDT, severe thunderstorms were located along a line
extending from 5 miles west of Mangum to near Duke to 9 miles west
of Eldorado, moving east at 25 mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
* Locations impacted include...
Altus, Mangum, Eldorado, Martha, Gould, Duke, Altus Air Force Base,
Hester and McQueen.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3467 9989 3490 9974 3486 9938 3464 9928
3446 9966 3444 9991 3453 9999
TIME...MOT...LOC 2228Z 260DEG 22KT 3486 9961 3469 9955 3452 9980
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
WR1 follow-up statement
190
WWUS54 KOUN 192243
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
543 PM CDT Thu Aug 19 2021
OKC055-057-065-TXC197-192315-
/O.CON.KOUN.SV.W.0460.000000T0000Z-210819T2315Z/
Jackson OK-Harmon OK-Greer OK-Hardeman TX-
543 PM CDT Thu Aug 19 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR CENTRAL JACKSON...SOUTHERN HARMON...SOUTH CENTRAL GREER AND
NORTHWESTERN HARDEMAN COUNTIES...
At 543 PM CDT, severe thunderstorms were located along a line
extending from 4 miles south of Mangum to 3 miles east of Duke to 8
miles west of Eldorado, moving east at 25 mph.
HAZARD...70 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Altus, Eldorado, Martha, Gould, Duke, Altus Air Force Base and
McQueen.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3467 9989 3486 9969 3479 9940 3464 9928
3446 9966 3444 9991 3456 9997
TIME...MOT...LOC 2243Z 279DEG 22KT 3482 9952 3465 9951 3450 9980
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
WRThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 4:59 PM CDT | Severe Thunderstorm Warning | OUN | Hardeman | 31 min |
| Aug 19, 6:02 PM CDT | Severe Thunderstorm Warning | OUN | Wilbarger | 28 min |
| Aug 19, 6:54 PM CDT | Special Weather Statement | OUN | Hardeman | 36 min |
| Aug 19, 7:38 AM CDT | Areal Flood Advisory | OUN | Comanche | 36 min |
| Aug 19, 8:14 AM CDT | Flash Flood Warning | OUN | Comanche | 3 hr |
| Aug 19, 3:27 PM CDT | Special Weather Statement | OUN | Beckham | 33 min |
| Aug 19, 3:29 PM CDT | Special Weather Statement | OUN | Harmon | 31 min |
| Aug 19, 4:10 PM CDT | Special Weather Statement | OUN | Beckham | 35 min |
| Aug 19, 5:14 PM CDT | Severe Thunderstorm Warning | OUN | Greer, Harmon, Jackson | 31 min |
| Aug 19, 6:26 PM CDT | Severe Thunderstorm Warning | OUN | Jackson, Tillman | 34 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2021Severe Thunderstorm Warnings in Texas, 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.