Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 310, NWS Norman, OK

June 12, 20219 counties in Oklahoma; Clay County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Jun 12, 2021, 4:17 AM CDT for 9 counties in Oklahoma; Clay County, Texas. It was in force for 43 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
Jun 12, 2021, 4:17 AM CDT (09:17 UTC)
Expired
Jun 12, 2021, 5:00 AM CDT
In force
43 min
Issued by
NWS Norman, OK
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Carter County, OK, Cotton County, OK, Garvin County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Stephens County, OK, Clay County, TX

The radar

The Altus AFB radar (KFDR), 130 km from the middle of the area, began a volume at 09:19 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

TimeReportWhereRemark
Jun 12, 4:20 AM CDTTSTM WND GST 661 N Ringling, OK

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 9.3 hours before the alert went out and 133 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.

Skew-T log-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2021-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3394 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2021-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
3394 J/kg
Mixed-layer CIN
-216 J/kg
Mixed-layer LCL
1175 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
225 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

The text

As transmitted.

527 
WUUS54 KOUN 120917
SVROUN
OKC019-033-049-067-069-085-095-099-137-TXC077-121000-
/O.NEW.KOUN.SV.W.0310.210612T0917Z-210612T1000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
417 AM CDT Sat Jun 12 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Western Johnston County in southeastern Oklahoma...
  Jefferson County in southern Oklahoma...
  Southeastern Garvin County in southern Oklahoma...
  Love County in southern Oklahoma...
  Southern Stephens County in southern Oklahoma...
  East central Cotton County in southwestern Oklahoma...
  Carter County in southern Oklahoma...
  Northern Marshall County in southeastern Oklahoma...
  Murray County in southern Oklahoma...
  Northeastern Clay County in northern Texas...

* Until 500 AM CDT.

* At 417 AM CDT, severe thunderstorms were located along a line
  extending from near Mill Creek to 5 miles southeast of Milo to 6
  miles west of Ringling to 5 miles northeast of Byers, moving
  southeast at 35 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...
  Ardmore, Sulphur, Madill, Tishomingo, Davis, Waurika, Lone Grove,
  Healdton, Wynnewood, Wilson, Comanche, Dickson, Ringling, Temple,
  Mannsville, Ryan, Springer, Velma, Ravia and Terral.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3389 9798 3387 9798 3427 9830 3446 9786
      3460 9738 3473 9703 3412 9656 3399 9698
      3391 9734 3389 9745 3392 9749 3390 9759
      3395 9759 3399 9767 3394 9773 3393 9776
      3389 9778 3390 9780 3386 9783 3385 9787
TIME...MOT...LOC 0917Z 321DEG 28KT 3437 9685 3429 9726 3421 9769 3412
9812

HAIL...1.00IN
WIND...60MPH
 
$$

30
1 follow-up statement
063 
WWUS54 KOUN 120929
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
429 AM CDT Sat Jun 12 2021

OKC019-033-049-067-069-085-095-099-137-TXC077-121000-
/O.CON.KOUN.SV.W.0310.000000T0000Z-210612T1000Z/
Johnston OK-Jefferson OK-Garvin OK-Love OK-Stephens OK-Cotton OK-
Carter OK-Marshall OK-Murray OK-Clay TX-
429 AM CDT Sat Jun 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 AM CDT
FOR WESTERN JOHNSTON...JEFFERSON...SOUTHEASTERN GARVIN...LOVE...
SOUTHERN STEPHENS...EAST CENTRAL COTTON...CARTER...NORTHERN
MARSHALL...MURRAY AND NORTHEASTERN CLAY COUNTIES...

At 429 AM CDT, severe thunderstorms were located along a line
extending from near Ravia to near Ardmore to 5 miles south of
Ringling to 4 miles west of Ryan, moving southeast at 30 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...
Ardmore, Sulphur, Madill, Tishomingo, Davis, Waurika, Lone Grove,
Healdton, Wynnewood, Wilson, Comanche, Dickson, Ringling, Temple,
Mannsville, Ryan, Springer, Velma, Ravia and Terral.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3389 9798 3387 9798 3427 9830 3446 9786
      3460 9738 3473 9703 3412 9656 3399 9698
      3391 9734 3389 9745 3392 9749 3390 9759
      3395 9759 3399 9767 3394 9773 3393 9776
      3389 9778 3390 9780 3386 9783 3385 9787
TIME...MOT...LOC 0929Z 312DEG 28KT 3427 9677 3419 9718 3411 9761 3402
9804

HAIL...1.00IN
WIND...70MPH
 
$$

30

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 11, 10:17 PM CDTSpecial Weather StatementOUNKay13 min
Jun 11, 10:23 PM CDTSevere Thunderstorm WarningOUNKay52 min
Jun 11, 10:35 PM CDTSevere Thunderstorm WarningOUNGrant40 min
Jun 11, 10:48 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Grant27 min
Jun 11, 10:59 PM CDTSevere Thunderstorm WarningOUNGrant, Kay16 min
Jun 11, 11:08 PM CDTSevere Thunderstorm WarningOUNKay, Noble52 min
Jun 11, 11:14 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Garfield, Grant, Kay, Major, Noble and 1 more46 min
Jun 11, 11:34 PM CDTSpecial Weather StatementOUNPayne26 min
Jun 11, 11:58 PM CDTSevere Thunderstorm WarningOUNLincoln, Logan, Noble, Payne47 min
Jun 12, 12:01 AM CDTSpecial Weather StatementOUNAlfalfa, Garfield, Logan29 min
Jun 12, 12:10 AM CDTAreal Flood AdvisoryOUNAlfalfa, Garfield, Grant3 hr
Jun 12, 12:26 AM CDTSevere Thunderstorm WarningOUNAlfalfa33 min
Jun 12, 12:33 AM CDTSpecial Weather StatementOUNKingfisher, Logan27 min
Jun 12, 12:44 AM CDTSpecial Weather StatementOUNLincoln, Oklahoma, Payne31 min
Jun 12, 1:05 AM CDTSevere Thunderstorm WarningOUNLincoln40 min
Jun 12, 1:07 AM CDTSpecial Weather StatementOUNCanadian, Kingfisher, Logan, Oklahoma38 min
Jun 12, 1:42 AM CDTSpecial Weather StatementOUNBlaine, Canadian, Cleveland, Grady, Lincoln, McClain and 3 more48 min
Jun 12, 2:19 AM CDTSpecial Weather StatementOUNCaddo, Comanche, Grady41 min
Jun 12, 2:37 AM CDTSevere Thunderstorm WarningOUNCaddo, Comanche, Grady38 min
Jun 12, 2:40 AM CDTSpecial Weather StatementOUNCleveland, McClain, Pottawatomie, Seminole35 min
Jun 12, 2:45 AM CDTSpecial Weather StatementOUNWashita30 min
Jun 12, 3:00 AM CDTSevere Thunderstorm WarningOUNCaddo, Comanche, Garvin, Grady, McClain, Stephens45 min
Jun 12, 3:10 AM CDTSpecial Weather StatementOUNHughes, Pontotoc, Seminole50 min
Jun 12, 3:39 AM CDTSevere Thunderstorm WarningOUNCarter, Comanche, Cotton, Garvin, Grady, Jefferson and 3 more51 min
Jun 12, 3:58 AM CDTSpecial Weather StatementOUNCoal, Hughes, Johnston, Pontotoc32 min
Jun 12, 4:49 AM CDTSevere Thunderstorm WarningOUNBryan, Carter, Jefferson, Johnston, Love, Marshall41 min
Jun 12, 5:33 AM CDTSpecial Weather StatementOUNBryan, Love, Marshall27 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.