Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 761, NWS Norman, OK

October 29, 20094 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 29, 2009, 6:40 AM CDT for 4 counties in Oklahoma. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Oct 29, 2009, 6:40 AM CDT (11:40 UTC)
Expired
Oct 29, 2009, 7:30 AM CDT
In force
50 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Carter County, OK, Jefferson County, OK, Murray County, OK, Stephens County, OK

The radar

The Norman radar (KTLX), 113 km from the middle of the area, began a volume at 11:43 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 watch it was issued in

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

IssuedProductOfficeLasted
Oct 29, 1:19 AM CDTTornado WatchSPC6 hr
Oct 29, 1:59 AM CDTTornado WatchSPC5 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 11.7 hours before the alert went out and 168 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, Fort Worth, TX at 00:00Z on 2009-10-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 947 joules per kilogram.LCLLFCEL10008507005003002001001 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, Fort Worth, TX at 00:00Z on 2009-10-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 484 square meters per square second.19395878Sfc1 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
947 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
602 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
484 m²/s²
0-3 km storm-relative helicity
599 m²/s²
Significant tornado parameter
3.4
Supercell composite
18.8

Open this sounding in Storm Lab

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 Oct 29, 3:28 AM CDT, 3 hours 12 minutes earlier.

Area forecast discussion, Oct 29, 3:28 AM CDT, 3 hours 12 minutes before
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Hazardous weather outlook, Oct 28, 8:10 PM CDT, 10 hours 30 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE NORMAN OK
810 PM CDT WED OCT 28 2009

OKZ004>048-050>052-TXZ083>090-291000-
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-
810 PM CDT WED OCT 28 2009

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

.DAY ONE...TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS TONIGHT OVER ALL OF
WESTERN NORTH TEXAS AND PORTIONS OF OKLAHOMA.

LOCATION...
THE SLIGHT RISK AREA COVERS ALL OF WESTERN NORTH TEXAS AND PORTIONS
OF OKLAHOMA WEST OF A LINE EXTENDING FROM MEDFORD...TO THE OKLAHOMA
CITY METRO...TO MADILL.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE FROM 10 PM
THROUGH THE OVERNIGHT HOURS.

IMPACTS...
DAMAGING WIND GUSTS TO 70 MPH WILL BE THE PRIMARY CONCERN. HAIL TO
THE SIZE OF HALF-DOLLARS WILL ALSO BE POSSIBLE WITH THE STRONGER
STORMS.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS THIS EVENING AND
OVERNIGHT.

DISCUSSION...
THUNDERSTORMS DEVELOPED OVER THE TEXAS PANHANDLE THIS EVENING IN
ADVANCE OF A STRONG STORM SYSTEM MOVING OUT OF THE ROCKIES. THESE
STORMS ARE EXPECTED TO MOVE INTO WESTERN PARTS OF OKLAHOMA AND NORTH
TEXAS LATER THIS EVENING. ALTHOUGH INSTABILITY IS EXPECTED TO BE LOW
WHEN THIS STORM SYSTEM PUSHES INTO THE REGION...VERY STRONG WIND
SHEAR AND UPWARD FORCING FROM THE STORM WILL LIKELY ALLOW SOME
STORMS TO REACH SEVERE LEVELS. SEVERE STORMS WILL BE POSSIBLE ALONG
AND AHEAD OF A COLD FRONT FROM LATE EVENING THROUGH THE OVERNIGHT
HOURS. THE FRONT IS FORECAST TO APPROACH FAR WESTERN OKLAHOMA AND
WESTERN NORTH TEXAS LATE THIS EVENING...THEN PROGRESS EASTWARD
OVERNIGHT...REACHING THE I-35 CORRIDOR AROUND MID-MORNING THURSDAY.
ALTHOUGH THE GREATEST SEVERE WEATHER RISK WILL BE ASSOCIATED WITH A
SQUALL-LINE ALONG THE COLD FRONT...ANY DISCRETE THUNDERSTORMS AHEAD
OF THE LINE WILL ALSO HAVE THE POTENTIAL TO PRODUCE SEVERE WEATHER.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT THURSDAY OCT 29.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...70  PERCENT

OTHER HAZARDOUS WEATHER...
NONE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

THUNDERSTORM OUTLOOK...
THUNDERSTORMS...SOME STRONG AND POSSIBLY SEVERE...ARE EXPECTED TO BE
ONGOING THURSDAY MORNING ACROSS CENTRAL PORTIONS OF OKLAHOMA.
THUNDERSTORM ACTIVITY IS EXPECTED TO SHIFT EASTWARD DURING THE DAY
THURSDAY...EXITING THE NWS NORMAN COUNTY WARNING AREA BY LATE
AFTERNOON.

OTHER HAZARDOUS WEATHER...
A FROST OR LIGHT FREEZE IS POSSIBLE FRIDAY AND SATURDAY MORNINGS
ACROSS WESTERN AND NORTHERN PORTIONS OF OKLAHOMA.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED BY
5 AM THURSDAY.

In the hours before

Special weather statement, Oct 29, 3:00 AM CDT, 3 hours 40 minutes before
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Special weather statement, Oct 29, 3:33 AM CDT, 3 hours 7 minutes before
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Special weather statement, Oct 29, 4:10 AM CDT, 2 hours 30 minutes before
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Special weather statement, Oct 29, 4:59 AM CDT, 1 hour 41 minutes before
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Special weather statement, Oct 29, 5:31 AM CDT, 1 hour 9 minutes before
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Special weather statement, Oct 29, 6:18 AM CDT, 22 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
618 AM CDT THU OCT 29 2009

OKZ008-013-019-020-025>030-039-040-045-046-TXZ090-291145-
LINCOLN OK-LOGAN OK-NOBLE OK-KAY OK-OKLAHOMA OK-POTTAWATOMIE OK-
PAYNE OK-CLEVELAND OK-GRADY OK-MCCLAIN OK-JEFFERSON OK-GARVIN OK-
CARTER OK-STEPHENS OK-CLAY TX-
618 AM CDT THU OCT 29 2009

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR CARTER...CLAY...CLEVELAND...
GARVIN...GRADY...JEFFERSON...KAY...LINCOLN...LOGAN...MCCLAIN...
NOBLE...OKLAHOMA...PAYNE...POTTAWATOMIE AND STEPHENS COUNTIES.

AT 618 AM CDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM PONCA
CITY... TO STILLWATER... TO GUTHRIE AND THE OKLAHOMA CITY METRO
SOUTH TO LINDSEY... TO DUNCAN... TO SUGDEN...MOVING NORTHEAST AT 40
MPH.

HAZARDS INCLUDE...
WIND GUSTS TO 50 MPH...
FREQUENT CLOUD TO GROUND LIGHTNING...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

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

LAT...LON 3675 9682 3675 9689 3669 9694 3669 9706
      3660 9704 3661 9691 3658 9688 3651 9703
      3635 9702 3634 9692 3626 9689 3592 9694
      3511 9719 3400 9774 3408 9815 3475 9793
      3555 9758 3606 9744 3690 9741 3696 9679

30

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 29, 6:29 AM CDTSevere Thunderstorm WarningOUNNoble, Payne31 min
Oct 29, 10:34 AM CDTSevere Thunderstorm WarningOUNCoal, Hughes, Pontotoc, Seminole41 min
Oct 29, 10:37 AM CDTTornado WarningOUNHughes38 min
Oct 29, 10:53 AM CDTSevere Thunderstorm WarningOUNCoal, Hughes, Pontotoc37 min
Oct 29, 11:28 AM CDTSevere Thunderstorm WarningOUNCoal, Hughes62 min
Oct 29, 2:48 PM CDTRiver Flood WarningOUNBlaine, Caddo, Canadian, Custer5 hr
Oct 29, 2:48 PM CDTRiver Flood WarningOUNPottawatomie, Seminole5 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2009Every severe thunderstorm warning in 2009

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.