Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 21, NWS Norman, OK

April 10, 2011Hughes County, Pontotoc County, Seminole County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 10, 2011, 9:27 PM CDT for Hughes County, Pontotoc County, Seminole County, Oklahoma. It was in force for 48 min. 4 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
Apr 10, 2011, 9:27 PM CDT (02:27 UTC)
Expired
Apr 10, 2011, 10:15 PM CDT
In force
48 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Hughes County, OK, Pontotoc County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 110 km from the middle of the area, began a volume at 02:30 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.

What was reported inside it

TimeReportWhereRemark
Apr 10, 9:35 PM CDTTSTM WND DMGHoldenville, OK60 FT POWER POLES SHEARED OFF 30 FT ABOVE THE GROUND.
Apr 10, 9:35 PM CDTHAIL 1Holdenville, OK
Apr 10, 9:35 PM CDTHAIL 1.75Holdenville, OKLOTS OF QUARTER TO GOLF BALL SIZE HAIL WAS REPORTED BY THE CITY EMERGENCY MANAGER.
Apr 10, 10:05 PM CDTTSTM WND DMG6 Nw Scipio, OKSMOKER TOSSED AND DAMAGED BY THE WIND.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 10, 7:28 PM CDTTornado WatchSPC8 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.5 hours before the alert went out and 119 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 2011-04-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2011-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3641 m above ground
0-6 km bulk shear
75 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
279 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

671 
WUUS54 KOUN 110227
SVROUN
OKC063-123-133-110315-
/O.NEW.KOUN.SV.W.0021.110411T0227Z-110411T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
927 PM CDT SUN APR 10 2011

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN PONTOTOC COUNTY IN EAST CENTRAL OKLAHOMA...
  SOUTHEASTERN SEMINOLE COUNTY IN EAST CENTRAL OKLAHOMA...
  HUGHES COUNTY IN SOUTHEAST OKLAHOMA...

* UNTIL 1015 PM CDT

* AT 927 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
  THUNDERSTORM 7 MILES NORTHWEST OF ALLEN...MOVING EAST AT 55 MPH.

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF QUARTERS...
WIND GUSTS TO 65 MPH...

* LOCATIONS IN THE WARNING INCLUDE ALLEN...ATWOOD...CALVIN...
  DUSTIN...HOLDENVILLE...HORNTOWN...LAMAR...SPAULDING...WEWOKA AND
  YEAGER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH NO ADVANCE WARNING.
MOVE IMMEDIATELY TO A STORM SHELTER... BASEMENT OR STURDY BUILDING IF
A TORNADO IS SIGHTED.

&&

LAT...LON 3514 9600 3512 9600 3509 9606 3507 9606
      3505 9607 3496 9608 3483 9648 3514 9657
      3530 9598 3529 9597 3516 9597
TIME...MOT...LOC 0227Z 248DEG 49KT 3498 9641

$$
2 follow-up statements
864 
WWUS54 KOUN 110251
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
951 PM CDT SUN APR 10 2011

OKC133-110301-
/O.CAN.KOUN.SV.W.0021.000000T0000Z-110411T0315Z/
SEMINOLE OK-
951 PM CDT SUN APR 10 2011

...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED FOR
SOUTHEASTERN SEMINOLE COUNTY...

LAT...LON 3514 9600 3512 9600 3509 9606 3507 9606
      3505 9607 3496 9608 3483 9648 3509 9635
      3530 9598 3529 9597 3516 9597
TIME...MOT...LOC 0251Z 248DEG 49KT 3513 9611

$$

OKC063-123-110315-
/O.CON.KOUN.SV.W.0021.000000T0000Z-110411T0315Z/
HUGHES OK-PONTOTOC OK-
951 PM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR NORTHEASTERN PONTOTOC AND HUGHES COUNTIES...

AT 951 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED SEVERE 
THUNDERSTORMS NEAR LAMAR AND NEAR ALLEN...MOVING EAST AT 55 MPH.

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF QUARTERS...
WIND GUSTS TO 60 MPH...

* LOCATIONS IN THE WARNING INCLUDE ALLEN...ATWOOD...CALVIN...
  DUSTIN...HORNTOWN AND LAMAR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH NO ADVANCE WARNING.
MOVE IMMEDIATELY TO A STORM SHELTER... BASEMENT OR STURDY BUILDING IF
A TORNADO IS SIGHTED.

&&

LAT...LON 3514 9600 3512 9600 3509 9606 3507 9606
      3505 9607 3496 9608 3483 9648 3509 9635
      3530 9598 3529 9597 3516 9597
TIME...MOT...LOC 0251Z 248DEG 49KT 3513 9611

$$
442 
WWUS54 KOUN 110314
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1014 PM CDT SUN APR 10 2011

OKC063-123-110324-
/O.EXP.KOUN.SV.W.0021.000000T0000Z-110411T0315Z/
HUGHES OK-PONTOTOC OK-
1014 PM CDT SUN APR 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PONTOTOC AND
HUGHES COUNTIES WILL EXPIRE AT 1015 PM CDT...

THE STORM HAS MOVED OUT OF THE AREA.

LAT...LON 3514 9600 3512 9600 3509 9606 3507 9606
      3505 9607 3496 9608 3483 9648 3509 9635
      3530 9598 3529 9597 3516 9597
TIME...MOT...LOC 0314Z 248DEG 49KT 3525 9575

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 10, 8:26 PM CDTSpecial Weather StatementOUNLove, Marshall34 min
Apr 10, 8:31 PM CDTSevere Thunderstorm WarningOUNCarter, Johnston, Love, Marshall, Murray44 min
Apr 10, 8:59 PM CDTSpecial Weather StatementOUNMarshall31 min
Apr 10, 9:10 PM CDTSevere Thunderstorm WarningOUNCoal, Hughes, Johnston, Pontotoc39 min
Apr 10, 9:23 PM CDTSpecial Weather StatementOUNHughes37 min
Apr 10, 9:37 PM CDTSpecial Weather StatementOUNMarshall23 min
Apr 10, 10:06 PM CDTSevere Thunderstorm WarningOUNAtoka54 min
Apr 10, 10:22 PM CDTSpecial Weather StatementOUNJohnston23 min
Apr 10, 10:44 PM CDTSpecial Weather StatementOUNCarter31 min
Apr 10, 11:07 PM CDTSpecial Weather StatementOUNHughes23 min
Apr 11, 12:35 AM CDTSpecial Weather StatementOUNBryan25 min
Apr 11, 12:59 AM CDTSpecial Weather StatementOUNBryan16 min
Apr 11, 1:11 AM CDTSpecial Weather StatementOUNBryan34 min
Apr 11, 1:45 AM CDTSpecial Weather StatementOUNBryan15 min
Apr 11, 3:49 PM CDTFire Weather WatchOUNBeckham, Ellis, Greer, Harmon, Harper, Roger Mills and 2 more11 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2011Every severe thunderstorm warning in 2011

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.