Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 651, NWS Norman, OK

August 12, 2013Harper County, Woods County, Woodward County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 12, 2013, 6:59 PM CDT for Harper County, Woods County, Woodward County, Oklahoma. It was in force for 31 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
Aug 12, 2013, 6:59 PM CDT (23:59 UTC)
Expired
Aug 12, 2013, 7:30 PM CDT
In force
31 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Harper County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 102 km from the middle of the area, began a volume at 00:01 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 nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 12.0 hours before the alert went out and 232 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 12:00Z on 2013-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1213 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, Norman, OK at 12:00Z on 2013-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 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
1213 J/kg
Mixed-layer CIN
-114 J/kg
Mixed-layer LCL
1314 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
28 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Aug 12, 6:25 PM CDT, 34 minutes earlier.

Area forecast discussion, Aug 12, 6:25 PM CDT, 34 minutes before
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Hazardous weather outlook, Aug 12, 4:50 PM CDT, 2 hours 9 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATE
NATIONAL WEATHER SERVICE NORMAN OK
450 PM CDT MON AUG 12 2013

OKZ004>048-050>052-TXZ083>090-131000-
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-
450 PM CDT MON AUG 12 2013

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

.DAY ONE...THROUGH TONIGHT...

THUNDERSTORM OUTLOOK...
WIDESPREAD THUNDERSTORMS ARE EXPECTED. A FEW STORMS WILL BE
SEVERE AND PRODUCE DAMAGING WIND GUSTS AND HAIL UP TO THE
SIZE OF HALF DOLLARS.

DISCUSSION...
A STALLED FRONT ACROSS NORTHERN OKLAHOMA WILL BE A FOCUS FOR
STORMS. SOME OF THOSE WILL LIKELY BE SEVERE THROUGH THE EVENING.
AN OUTFLOW BOUNDARY FROM LAST NIGHTS SHOWERS AND STORMS PUSHED
INTO SOUTHERN OKLAHOMA AND WILL BE A FOCUS FOR SCATTERED STORMS
AS WELL. ALTHOUGH MOST OF THE STORMS WILL DECREASE IN BOTH
COVERAGE AND INTENSITY TOWARD AND AFTER SUNSET...ADDITIONAL
STORMS ARE FORECAST TO DEVELOP OVER NORTHWEST AND NORTH CENTRAL
OKLAHOMA OVERNIGHT. VERY HEAVY RAINFALL OVER AREAS THAT HAVE
HAD RECENT HIGH RAIN TOTALS WILL LEAD TO THE THREAT FOR FLASH
FLOODING. A FLASH FLOOD WATCH IS IN EFFECT THROUGH TUESDAY FOR
NORTHERN AND PARTS OF CENTRAL OKLAHOMA.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT TUESDAY AUG 13.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...40 PERCENT.

OTHER HAZARDOUS WEATHER...
A VERY MOIST ATMOSPHERE AND SLOW MOVING STORMS WILL SUPPORT THE
POTENTIAL FOR FLASH FLOODING...ESPECIALLY LATE TONIGHT ACROSS
NORTHERN AND CENTRAL OKLAHOMA.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

THUNDERSTORM OUTLOOK...
SHOWER AND THUNDERSTORM CHANCES WILL CONTINUE ACROSS MUCH OF
OKLAHOMA AND WESTERN NORTH TEXAS TUESDAY THROUGH LATE WEDNESDAY
AS A COLD FRONT SLOWLY MOVES ACROSS THE REGION. LOCALIZED FLASH
FLOODING MAY ACCOMPANY THE STRONGER STORMS THAT MANAGE TO
DEVELOP. ALTHOUGH A FEW OF THE STORMS COULD PRODUCE WIND GUSTS
EXCEEDING 60 MPH AND HAIL UP TO THE SIZE OF QUARTERS...WIDESPREAD
SEVERE WEATHER IS NOT EXPECTED. THUNDERSTORM CHANCES SHOULD
GRADUALLY DECREASE BY THURSDAY.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT
500 AM TUESDAY.

In the hours before

Special weather statement, Aug 12, 5:59 PM CDT, 1 hour before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
559 PM CDT MON AUG 12 2013

OKZ014>016-122330-
ROGER MILLS OK-CUSTER OK-DEWEY OK-
559 PM CDT MON AUG 12 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN ROGER MILLS...
NORTHWESTERN CUSTER AND SOUTHWESTERN DEWEY COUNTIES UNTIL 630 PM
CDT...

AT 558 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR ANGORA...
MOVING EAST AT 10 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 50 MPH...

LOCATIONS IMPACTED INCLUDE...
LEEDEY...MOOREWOOD AND ANGORA.

LAT...LON 3587 9956 3590 9955 3593 9951 3594 9951
      3594 9926 3572 9922 3571 9954 3586 9957
TIME...MOT...LOC 2258Z 258DEG 10KT 3582 9948

KURTZ
Special weather statement, Aug 12, 6:01 PM CDT, 58 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
601 PM CDT MON AUG 12 2013

OKZ022-023-122315-
WASHITA OK-CADDO OK-
601 PM CDT MON AUG 12 2013

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN WASHITA AND WESTERN CADDO
COUNTIES UNTIL 615 PM CDT...

AT 558 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 4 MILES SOUTH OF
COLONY...MOVING EAST AT 10 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 50 MPH...

LOCATIONS IMPACTED INCLUDE...
EAKLY AND COLONY.

LAT...LON 3523 9870 3533 9872 3542 9857 3523 9850
TIME...MOT...LOC 2258Z 252DEG 9KT 3529 9867

KURTZ
Special weather statement, Aug 12, 6:34 PM CDT, 25 minutes before
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Special weather statement, Aug 12, 6:36 PM CDT, 23 minutes before
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Special weather statement, Aug 12, 6:37 PM CDT, 22 minutes before
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Special weather statement, Aug 12, 6:55 PM CDT, 4 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 11, 7:08 PM CDTSpecial Weather StatementOUNHarmon37 min
Aug 11, 7:24 PM CDTSevere Thunderstorm WarningOUNBeckham, Greer, Harmon51 min
Aug 11, 7:33 PM CDTSpecial Weather StatementOUNKiowa27 min
Aug 11, 7:59 PM CDTSpecial Weather StatementOUNBeckham, Greer31 min
Aug 11, 8:15 PM CDTSevere Thunderstorm WarningOUNBeckham, Greer, Kiowa, Washita45 min
Aug 11, 8:51 PM CDTSpecial Weather StatementOUNWashita24 min
Aug 11, 9:02 PM CDTSpecial Weather StatementOUNWashita28 min
Aug 11, 9:27 PM CDTSpecial Weather StatementOUNCuster33 min
Aug 11, 10:00 PM CDTSpecial Weather StatementOUNCuster30 min
Aug 11, 10:23 PM CDTSpecial Weather StatementOUNBlaine, Woodward37 min
Aug 11, 10:43 PM CDTSpecial Weather StatementOUNKiowa32 min
Aug 11, 11:09 PM CDTSpecial Weather StatementOUNGreer36 min
Aug 11, 11:11 PM CDTSpecial Weather StatementOUNEllis34 min
Aug 11, 11:40 PM CDTSevere Thunderstorm WarningOUNEllis, Harper, Woodward50 min
Aug 11, 11:42 PM CDTSpecial Weather StatementOUNComanche33 min
Aug 11, 11:43 PM CDTSpecial Weather StatementOUNWashita32 min
Aug 12, 4:26 AM CDTFlash Flood WatchOUNAlfalfa, Atoka, Beckham, Blaine, Caddo, Canadian and 29 more34 hr
Aug 12, 2:31 PM CDTSpecial Weather StatementOUNCoal29 min
Aug 12, 3:05 PM CDTSpecial Weather StatementOUNCotton25 min
Aug 12, 3:41 PM CDTSpecial Weather StatementOUNBlaine, Dewey34 min
Aug 12, 3:44 PM CDTSpecial Weather StatementOUNCoal31 min
Aug 12, 3:48 PM CDTSevere Thunderstorm WarningOUNBlaine, Custer, Dewey42 min
Aug 12, 4:03 PM CDTSevere Thunderstorm WarningOUNHughes, Pontotoc, Seminole27 min
Aug 12, 4:29 PM CDTSevere Thunderstorm WarningOUNBlaine, Custer46 min
Aug 12, 4:31 PM CDTSpecial Weather StatementOUNHughes29 min
Aug 12, 4:42 PM CDTSpecial Weather StatementOUNCuster33 min
Aug 12, 4:44 PM CDTSpecial Weather StatementOUNEllis31 min
Aug 12, 4:54 PM CDTSpecial Weather StatementOUNMurray36 min
Aug 12, 5:45 PM CDTSpecial Weather StatementOUNMurray30 min
Aug 12, 5:50 PM CDTSpecial Weather StatementOUNEllis25 min
Aug 12, 5:59 PM CDTSpecial Weather StatementOUNRoger Mills31 min
Aug 12, 6:01 PM CDTSpecial Weather StatementOUNCaddo14 min
Aug 12, 6:12 PM CDTSevere Thunderstorm WarningOUNCuster, Dewey, Roger Mills18 min
Aug 12, 6:16 PM CDTFlash Flood WarningOUNMurray3 hr
Aug 12, 6:34 PM CDTSpecial Weather StatementOUNMurray26 min
Aug 12, 6:36 PM CDTSpecial Weather StatementOUNCuster, Dewey39 min
Aug 12, 6:37 PM CDTSpecial Weather StatementOUNEllis38 min
Aug 12, 6:55 PM CDTSpecial Weather StatementOUNWoods35 min
Aug 11, 9:05 PM CDTSpecial Weather StatementOUNWichita25 min
Aug 11, 9:26 PM CDTSpecial Weather StatementOUNClay, Wichita34 min
Aug 11, 9:58 PM CDTSpecial Weather StatementOUNWichita32 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2013Every severe thunderstorm warning in 2013

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.