Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 308, NWS Norman, OK

June 12, 20216 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 12, 2021, 3:00 AM CDT for 6 counties in Oklahoma. It was in force for 45 min. 2 reports 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, 3:00 AM CDT (08:00 UTC)
Expired
Jun 12, 2021, 3:45 AM CDT
In force
45 min
Issued by
NWS Norman, OK
Area
Storm-based polygon
Hail
0.75 in
Wind
70.0 mph

Counties Caddo County, OK, Comanche County, OK, Garvin County, OK, Grady County, OK, McClain County, OK, Stephens County, OK

The radar

The Norman radar (KTLX), 95 km from the middle of the area, began a volume at 08:03 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, 3:30 AM CDTTSTM WND GST 587 Nw Velma, OK
Jun 12, 3:35 AM CDTTSTM WND GST 677 Nw Velma, 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, 8.0 hours before the alert went out and 78 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.

495 
WUUS54 KOUN 120800
SVROUN
OKC015-031-049-051-087-137-120845-
/O.NEW.KOUN.SV.W.0308.210612T0800Z-210612T0845Z/

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

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Northeastern Comanche County in southwestern Oklahoma...
  Northwestern Garvin County in southern Oklahoma...
  Grady County in central Oklahoma...
  Southern Caddo County in southwestern Oklahoma...
  Northern Stephens County in southern Oklahoma...
  McClain County in central Oklahoma...

* Until 345 AM CDT.

* At 300 AM CDT, severe thunderstorms were located along a line
  extending from 4 miles southwest of Dibble to 5 miles north of Bray
  to 4 miles west of Marlow to near Fort Sill, moving southeast at 35
  mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Lawton, Duncan, Chickasha, Newcastle, Blanchard, Purcell, Marlow,
  Lindsay, Elgin, Apache, Maysville, Rush Springs, Bray, Fletcher,
  Cyril, Dibble, Sterling, Wayne, Washington and Cole.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3457 9854 3486 9862 3519 9757 3490 9726
      3443 9773
TIME...MOT...LOC 0800Z 336DEG 31KT 3501 9770 3472 9781 3462 9803 3467
9847

HAIL...<.75IN
WIND...70MPH
 
$$

30
1 follow-up statement
398 
WWUS54 KOUN 120832
SVSOUN

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

OKC015-120842-
/O.CAN.KOUN.SV.W.0308.000000T0000Z-210612T0845Z/
Caddo OK-
332 AM CDT Sat Jun 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CADDO COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 3457 9854 3468 9856 3509 9747 3490 9726
      3443 9773
TIME...MOT...LOC 0832Z 262DEG 33KT 3486 9751 3457 9762 3447 9784 3452
9828

$$

OKC031-049-051-087-137-120845-
/O.CON.KOUN.SV.W.0308.000000T0000Z-210612T0845Z/
Comanche OK-Garvin OK-Grady OK-Stephens OK-McClain OK-
332 AM CDT Sat Jun 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 AM CDT
FOR NORTHEASTERN COMANCHE...NORTHWESTERN GARVIN...SOUTHERN GRADY...
NORTHERN STEPHENS AND SOUTHWESTERN MCCLAIN COUNTIES...

At 332 AM CDT, severe thunderstorms were located along a line
extending from 6 miles east of Lindsay to 8 miles southwest of Foster
to 8 miles southeast of Duncan to 6 miles east of Geronimo, moving
east at 40 mph.

HAZARD...60 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Lawton, Duncan, Purcell, Marlow, Lindsay, Elgin, Maysville, Rush
Springs, Bray, Dibble, Sterling, Wayne, Washington, Alex, Bradley,
Agawam, Criner, Fort Sill, Central High and Acme.

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 3457 9854 3468 9856 3509 9747 3490 9726
      3443 9773
TIME...MOT...LOC 0832Z 262DEG 33KT 3486 9751 3457 9762 3447 9784 3452
9828

HAIL...0.88IN
WIND...60MPH
 
$$

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, 3:10 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, 4:17 AM CDTSevere Thunderstorm WarningOUNCarter, Cotton, Garvin, Jefferson, Johnston, Love and 3 more43 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, 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.