Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 421, NWS Norman, OK

July 12, 2011Lincoln County, Pottawatomie County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 12, 2011, 3:19 PM CDT for Lincoln County, Pottawatomie County, Oklahoma. It was in force for 56 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: Jul 12, 2011, 3:19 PM CDT (20:19 UTC)
Expired: Jul 12, 2011, 4:15 PM CDT
In force: 56 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Lincoln County, OK, Pottawatomie County, OK

The radar

The Norman radar (KTLX), 38 km from the middle of the area, began a volume at 20:22 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 8.3 hours before the alert went out and 54 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 916 J/kg
Mixed-layer CIN: -156 J/kg
Mixed-layer LCL: 1689 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

090 
WUUS54 KOUN 122019
SVROUN
OKC081-125-122115-
/O.NEW.KOUN.SV.W.0421.110712T2019Z-110712T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
319 PM CDT TUE JUL 12 2011

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN LINCOLN COUNTY IN CENTRAL OKLAHOMA...
  NORTHWESTERN POTTAWATOMIE COUNTY IN CENTRAL OKLAHOMA...

* UNTIL 415 PM CDT

* AT 318 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED SEVERE 
  THUNDERSTORMS FROM 3 MILES NORTHEAST OF DALE TO BETHEL ACRES...
  MOVING NORTHEAST AT 20 MPH.

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF QUARTERS...
DAMAGING WIND GUSTS TO 70 MPH...

* LOCATIONS IN THE WARNING INCLUDE AYDELOTTE...BETHEL ACRES...
  CHANDLER...DALE...DAVENPORT...MCLOUD...MEEKER...PINK...SHAWNEE...
  SPARKS...STROUD AND WARWICK.

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 174 AND 188.

THIS INCLUDES INTERSTATE 44 BETWEEN MILE MARKERS 158 AND 182.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PARTICULARLY DAMAGING WINDS ARE EXPECTED. MOBILE HOMES AND HIGH
PROFILE VEHICLES ARE ESPECIALLY SUSCEPTIBLE TO HIGH WINDS AND MAY BE
OVERTURNED. MOVE TO A STURDY BUILDING AND STAY AWAY FROM WINDOWS.

LAT...LON 3532 9693 3524 9714 3536 9714 3571 9703
      3579 9661 3571 9660
TIME...MOT...LOC 2018Z 208DEG 18KT 3545 9698

$$

BURKE

2 follow-up statements

035 
WWUS54 KOUN 122053
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
353 PM CDT TUE JUL 12 2011

OKC081-125-122115-
/O.CON.KOUN.SV.W.0421.000000T0000Z-110712T2115Z/
LINCOLN OK-POTTAWATOMIE OK-
353 PM CDT TUE JUL 12 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR NORTHWESTERN POTTAWATOMIE AND SOUTHERN LINCOLN COUNTIES...

AT 352 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED SEVERE
THUNDERSTORMS ALONG A LINE EXTENDING FROM 3 MILES WEST OF DALE TO 4
MILES SOUTHWEST OF SPARKS...MOVING NORTHEAST AT 20 MPH.

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF QUARTERS...
DAMAGING WINDS TO 65 MPH...
VERY HEAVY RAIN...

* LOCATIONS IN THE WARNING INCLUDE AYDELOTTE...CHANDLER...DALE...
  DAVENPORT...MCLOUD...MEEKER...SPARKS...STROUD AND WARWICK.

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 174 AND 188.

THIS INCLUDES INTERSTATE 44 BETWEEN MILE MARKERS 158 AND 182.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PARTICULARLY DAMAGING WINDS ARE EXPECTED. MOBILE HOMES AND HIGH
PROFILE VEHICLES ARE ESPECIALLY SUSCEPTIBLE TO HIGH WINDS AND MAY BE
OVERTURNED. MOVE TO A STURDY BUILDING AND STAY AWAY FROM WINDOWS.

HEAVY RAINS MAY QUICKLY FLOOD LOW LYING AREAS SUCH AS CREEKS...
DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED
ROADS AS AUTOMOBILES CAN QUICKLY STALL.

&&

LAT...LON 3536 9690 3532 9714 3536 9714 3571 9703
      3579 9661 3571 9660
TIME...MOT...LOC 2052Z 214DEG 16KT 3539 9709 3558 9685

$$

BURKE

932 
WWUS54 KOUN 122116
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
416 PM CDT TUE JUL 12 2011

OKC081-125-122126-
/O.EXP.KOUN.SV.W.0421.000000T0000Z-110712T2115Z/
LINCOLN OK-POTTAWATOMIE OK-
416 PM CDT TUE JUL 12 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN POTTAWATOMIE AND
SOUTHERN LINCOLN COUNTIES HAS EXPIRED...

THE STORMS HAVE WEAKENED...BUT SMALL HAIL AND WIND GUSTS TO 50 MPH 
REMAIN LIKELY FROM MEEKER TO SHAWNEE AND DALE.

LAT...LON 3536 9690 3532 9714 3536 9714 3571 9703
      3579 9661 3571 9660
TIME...MOT...LOC 2053Z 214DEG 16KT 3539 9708 3558 9684

$$

BURKE

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 12, 12:20 PM CDT, 2 hours 59 minutes earlier.

Area forecast discussion, Jul 12, 12:20 PM CDT, 2 hours 59 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
1220 PM CDT TUE JUL 12 2011

.AVIATION...
/18Z TAFS/ AN INCREASE IN MID LEVEL MOISTURE RELATIVE TO YESTERDAY
AFTERNOON SHOULD RESULT IN ISOLATED TO SCATTERED THUNDERSTORMS
FROM THIS AFTERNOON INTO EARLY EVENING. SLOW MOVING STORMS MAY
YIELD MVFR CEILING/VISIBILITY... AS WELL AS STRONG WIND GUSTS.
EXPECTED SPARSE STORM COVERAGE WILL PRECLUDE USE OF TEMPO GROUPS.
VFR CONDITIONS ARE EXPECTED AT ALL TAF SITES FROM LATE EVENING
THROUGH 18Z WEDNESDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK 100  79 102  79 /  30  20  10  10
HOBART OK         98  82 105  80 /  40  20  10  10
WICHITA FALLS TX 103  83 107  81 /  20  20  10  10
GAGE OK           97  77 103  75 /  40  20  10  10
PONCA CITY OK     99  80  99  81 /  40  30  20  20
DURANT OK        101  79 100  78 /  20  20  10  20

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...HEAT ADVISORY UNTIL 9 PM CDT SATURDAY FOR OKZ004>048-050>052.

TX...HEAT ADVISORY UNTIL 9 PM CDT SATURDAY FOR TXZ083>090.

&&

11/03/03
TAYLOR

Hazardous weather outlook, Jul 12, 2:55 PM CDT, 24 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATE
NATIONAL WEATHER SERVICE NORMAN OK
255 PM CDT TUE JUL 12 2011

OKZ004>048-050>052-TXZ083>090-131200-
HARPER-WOODS-ALFALFA-GRANT-KAY-ELLIS-WOODWARD-MAJOR-GARFIELD-NOBLE-
ROGER MILLS-DEWEY-CUSTER-BLAINE-KINGFISHER-LOGAN-PAYNE-BECKHAM-
WASHITA-CADDO-CANADIAN-OKLAHOMA-LINCOLN-GRADY-MCCLAIN-CLEVELAND-
POTTAWATOMIE-SEMINOLE-HUGHES-HARMON-GREER-KIOWA-JACKSON-TILLMAN-
COMANCHE-STEPHENS-GARVIN-MURRAY-PONTOTOC-COAL-COTTON-JEFFERSON-
CARTER-JOHNSTON-ATOKA-LOVE-MARSHALL-BRYAN-HARDEMAN-FOARD-WILBARGER-
WICHITA-KNOX-BAYLOR-ARCHER-CLAY-
255 PM CDT TUE JUL 12 2011

THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THUNDERSTORM OUTLOOK...
SCATTERED THUNDERSTORMS ARE EXPECTED. ISOLATED STORMS PRODUCING
DAMAGING WIND GUSTS MAY OCCUR THROUGH EARLY EVENING.

DISCUSSION...
A SMALL UPPER LEVEL DISTURBANCE WILL MOVE SLOWLY OVER NORTHERN
OKLAHOMA. SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE NEAR
AND EAST OF THIS DISTURBANCE...AFFECTING MAINLY NORTH-CENTRAL AND
CENTRAL PARTS OF OKLAHOMA. THE MAIN CONCERNS WITH ANY THUNDERSTORMS
WILL BE DAMAGING WIND GUSTS...CLOUD TO GROUND LIGHTNING...AND HEAVY
RAINFALL.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT WEDNESDAY JUL 13.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
                  NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY A PARTICULAR STORM WILL BECOME SEVERE...40 PERCENT.

OTHER HAZARDOUS WEATHER...
EXCESSIVE HEAT IS EXPECTED THIS AFTERNOON...ESPECIALLY OVER WESTERN
NORTH TEXAS AND THE SOUTHEAST HALF OF OKLAHOMA...WHEN HEAT INDEX
VALUES ARE EXPECTED TO REACH 105 DEGREES. THE HEAT ADVISORY WILL
CONTINUE.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

THUNDERSTORM OUTLOOK...
SCATTERED AFTERNOON AND EVENING THUNDERSTORMS WILL BE POSSIBLE INTO
THE WEEKEND...BUT ANY RELIEF FROM THE HEAT WILL BE VERY BRIEF AND
COVER SMALL AREAS.

OTHER HAZARDOUS WEATHER...
EXCESSIVE HEAT IS EXPECTED TO PERSIST AND THE HEAT ADVISORY WILL BE
IN EFFECT UNTIL FURTHER NOTICE. FIRE DANGER WILL ALSO REMAIN ON THE
HIGH SIDE DUE TO THE HEAT AND PERSISTENT DROUGHT CONDITIONS.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 5 AM
WEDNESDAY.

In the hours before

Local storm report, Jul 12, 2:28 PM CDT, 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
228 PM CDT TUE JUL 12 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0130 PM     TSTM WND DMG     MIDWEST CITY            35.46N 97.37W
07/12/2011                   OKLAHOMA           OK   LAW ENFORCEMENT

            DAMAGE REPORTED TO POWER LINES IN THE MIDWEST CITY AREA

&&

MA

Local storm report, Jul 12, 2:35 PM CDT, 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
235 PM CDT TUE JUL 12 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0210 PM     TSTM WND GST     5 SW OKLAHOMA CITY      35.42N 97.58W
07/12/2011  M59 MPH          OKLAHOMA           OK   PUBLIC

            55 TO 60 MPH WIND GUSTS MEASURED AT THE INSTERSECTION OF
            SW 59TH STREET AND SOUTH MAY AVENUE

&&

MA

Local storm report, Jul 12, 2:52 PM CDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
252 PM CDT TUE JUL 12 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0238 PM     TSTM WND GST     1 NE WILL ROGERS AIRPOR 35.40N 97.59W
07/12/2011  M72 MPH          OKLAHOMA           OK   MESONET

            RECORDED BY OKC MICRONET

&&

MA

Special weather statement, Jul 12, 2:53 PM CDT, 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
253 PM CDT TUE JUL 12 2011

OKZ023-027-122030-
CADDO OK-GRADY OK-
253 PM CDT TUE JUL 12 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR CADDO AND GRADY COUNTIES.

AT 253 PM CDT...A STRONG THUNDERSTORM WAS LOCATED OVER GRACEMONT...
MOVING NORTHEAST AT 20 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...
FREQUENT CLOUD TO GROUND LIGHTNING...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

LAT...LON 3537 9829 3535 9792 3511 9816 3511 9826
      3519 9839

BURKE

Local storm report, Jul 12, 2:56 PM CDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
256 PM CDT TUE JUL 12 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0240 PM     HAIL             1 N WILL ROGERS AIRPORT 35.41N 97.60W
07/12/2011  E1.00 INCH       OKLAHOMA           OK   PUBLIC

            NICKEL TO QUARTER SIZED HAIL FALLING NORTH OF AIRPORT ON
            MERIDIAN AVE

&&

MA

Local storm report, Jul 12, 3:19 PM CDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
319 PM CDT TUE JUL 12 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0312 PM     TSTM WND GST     WILEY POST AIRPORT      35.53N 97.65W
07/12/2011  M69 MPH          OKLAHOMA           OK   ASOS

            MEASURED BY KPWA ASOS

&&

MA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 7:09 PM CDT	Severe Thunderstorm Warning	OUN	Beckham	53 min
Jul 11, 7:18 PM CDT	Special Weather Statement	OUN	Woodward	12 min
Jul 11, 7:30 PM CDT	Special Weather Statement	OUN	Major	15 min
Jul 11, 7:56 PM CDT	Special Weather Statement	OUN	Roger Mills	19 min
Jul 11, 8:00 PM CDT	Special Weather Statement	OUN	Major	15 min
Jul 11, 8:31 PM CDT	Special Weather Statement	OUN	Major	14 min
Jul 11, 8:55 PM CDT	Special Weather Statement	OUN	Major	20 min
Jul 12, 12:52 PM CDT	Special Weather Statement	OUN	Oklahoma	23 min
Jul 12, 1:15 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma	45 min
Jul 12, 1:20 PM CDT	Special Weather Statement	OUN	Payne	25 min
Jul 12, 1:46 PM CDT	Special Weather Statement	OUN	Oklahoma	29 min
Jul 12, 2:01 PM CDT	Special Weather Statement	OUN	Logan	29 min
Jul 12, 2:19 PM CDT	Special Weather Statement	OUN	Oklahoma	41 min
Jul 12, 2:29 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Payne	46 min
Jul 12, 2:32 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	58 min
Jul 12, 2:53 PM CDT	Special Weather Statement	OUN	Caddo	37 min
Jul 12, 3:32 PM CDT	Severe Thunderstorm Warning	OUN	Oklahoma	37 min
Jul 12, 3:58 PM CDT	Special Weather Statement	OUN	Oklahoma	32 min
Jul 12, 4:19 PM CDT	Special Weather Statement	OUN	Grady	26 min
Jul 12, 4:26 PM CDT	Special Weather Statement	OUN	Caddo	19 min
Jul 12, 4:39 PM CDT	Special Weather Statement	OUN	Jackson	36 min
Jul 12, 4:43 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	47 min
Jul 12, 4:44 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan	46 min
Jul 12, 4:46 PM CDT	Special Weather Statement	OUN	Canadian	29 min
Jul 12, 4:54 PM CDT	Special Weather Statement	OUN	Pottawatomie	36 min
Jul 12, 4:56 PM CDT	Special Weather Statement	OUN	Garfield	34 min
Jul 12, 5:02 PM CDT	Special Weather Statement	OUN	Kay	43 min
Jul 12, 5:09 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Major	51 min
Jul 12, 5:23 PM CDT	Special Weather Statement	OUN	Cleveland	37 min
Jul 12, 5:29 PM CDT	Special Weather Statement	OUN	Jackson	31 min
Jul 12, 5:37 PM CDT	Special Weather Statement	OUN	Pottawatomie	23 min
Jul 12, 5:40 PM CDT	Special Weather Statement	OUN	Kingfisher	35 min
Jul 12, 5:44 PM CDT	Severe Thunderstorm Warning	OUN	Grant	46 min
Jul 12, 5:54 PM CDT	Special Weather Statement	OUN	Seminole	36 min
Jul 12, 6:01 PM CDT	Special Weather Statement	OUN	Caddo	29 min
Jul 12, 6:08 PM CDT	Special Weather Statement	OUN	Garfield	22 min
Jul 12, 6:25 PM CDT	Special Weather Statement	OUN	Okfuskee	35 min
Jul 12, 6:29 PM CDT	Special Weather Statement	OUN	Kay	31 min
Jul 12, 6:34 PM CDT	Special Weather Statement	OUN	Pottawatomie	26 min
Jul 12, 6:37 PM CDT	Special Weather Statement	OUN	McClain	23 min
Jul 12, 6:58 PM CDT	Special Weather Statement	OUN	Hughes	17 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2011 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.