Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 136, NWS Norman, OK

April 14, 20124 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 14, 2012, 4:41 PM CDT for 4 counties in Oklahoma. It was in force for 49 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: Apr 14, 2012, 4:41 PM CDT (21:41 UTC)
Expired: Apr 14, 2012, 5:30 PM CDT
In force: 49 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

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

The radar

The Vance AFB radar (KVNX), 114 km from the middle of the area, began a volume at 21:41 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.

Issued	Product	Office	Lasted
Apr 14, 10:43 AM CDT	Tornado Watch PDS	SPC	7 hr

The nearest sounding before it

Dodge City, (KDDC), launched 12:00Z, 9.7 hours before the alert went out and 143 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: 1516 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 527 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 413 m²/s²
0-3 km storm-relative helicity: 432 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 11.6

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 Apr 14, 2:52 PM CDT, 1 hour 49 minutes earlier.

Area forecast discussion, Apr 14, 2:52 PM CDT, 1 hour 49 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
252 PM CDT SAT APR 14 2012

.DISCUSSION...
SIG SEVERE WEATHER EVENT BEGINNING TO UNFOLD ACROSS NORTHWEST
OKLAHOMA AND HIGH-RES MODELS INDICATE THAT WE WORST CONDITIONS
THROUGH THE AFTERNOON WILL BE OVER NORTHWEST/WEST-CENTRAL INTO
NORTH-CENTRAL OKLAHOMA WITH INTENSE SUPERCELLS AND POSSIBLY LONG-
TRACK TORNADOES. MODELS DECREASE THE THREAT THE FARTHER SOUTH YOU
GO...AT LEAST INITIALLY WITH SUPERCELLS. LATE THIS EVENING AND
OVERNIGHT THERE IS STILL A FAIRLY SUBSTANTIAL SIGNAL THAT SEVERE
SQUALL-LINE WILL FORM AND SWEEP OVER MUCH OF THE REGION.
RELATIVELY HIGH POPS WERE RETAINED FOR THIS. THIS LINE IS PROGD TO
SURGE THROUGH CENTRAL OKLAHOMA NEAR/JUST AFTER MIDNIGHT AND EXIT
FAR SOUTHEAST OKLAHOMA TOWARD SUNRISE SUNDAY. DAMAGING WINDS AND
EVEN EMBEDDED SHORT-LIVED TORNADOES POSSIBLE WITH THE LINE SO WE
SHOULD NOT LET OUR GUARD DOWN AFTER INITIAL DISCRETE SUPERCELL
MODE IS OVER.

NO CHANGES MADE TO REMAINING PERIODS WITH TRANQUIL WEATHER
EXPECTED UNTIL LATE NEXT WEEK.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  57  75  48  72 /  60  30  10   0
HOBART OK         51  75  44  72 /  70  20  10   0
WICHITA FALLS TX  58  77  47  75 /  70  40  10   0
GAGE OK           45  70  40  72 /  40  10  10   0
PONCA CITY OK     58  73  44  73 /  70  30  10   0
DURANT OK         65  75  51  73 /  40  70  20  10

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...WIND ADVISORY UNTIL 1 AM CDT SUNDAY FOR OKZ004>047-050-051.

TX...WIND ADVISORY UNTIL 1 AM CDT SUNDAY FOR TXZ083-085-086-090.

&&

84/11

Hazardous weather outlook, Apr 14, 11:42 AM CDT, 4 hours 59 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1142 AM CDT SAT APR 14 2012

OKZ004>048-050>052-TXZ083>090-151000-
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-
1142 AM CDT SAT APR 14 2012

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

.DAY ONE...TODAY AND TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A HIGH RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT
ACROSS MUCH OF NORTHERN AND CENTRAL OKLAHOMA. LESSER RISKS EXIST
ACROSS THE REMAINDER OF OKLAHOMA AND ADJACENT PARTS OF NORTH TEXAS.

LOCATION...
THE HIGH RISK AREA COVERS LOCATIONS NEAR AND EAST OF A LINE
EXTENDING FROM WOODWARD TO WEATHERFORD...AND AREAS NEAR AND NORTH OF
INTERSTATE-40. THIS COVERS THE CITIES OF WOODWARD...ENID...PONCA
CITY...WEATHERFORD...CLINTON...ALL OF THE OKLAHOMA CITY METRO...
STILLWATER...AND SHAWNEE.

A MODERATE RISK COVERS MUCH OF THE REST OF OKLAHOMA. A SLIGHT RISK
INCLUDES FAR SOUTHEAST OKLAHOMA AND WESTERN NORTH TEXAS.

TIMING...
THE MOST LIKELY TIME FOR SEVERE STORMS WILL BE FROM NOON THROUGH
THE OVERNIGHT HOURS. THE THREAT OF SEVERE WEATHER WILL END FROM WEST
TO EAST LATE THIS EVENING AND OVERNIGHT.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
NWS NORMAN COUNTY WARNING AREA SHOULD PLAN FOR SEVERE WEATHER
OPERATIONS THROUGH EARLY SUNDAY MORNING.

DISCUSSION...
WITH AN UNSTABLE AIRMASS IN PLACE AND VERY FAVORABLE WIND FIELDS
DEVELOPING THROUGH THE DAY...SEVERE THUNDERSTORMS ARE EXPECTED.
SCATTERED SUPERCELL THUNDERSTORMS MAY DEVELOP AHEAD OF A DRYLINE
ACROSS WESTERN PORTIONS OF OKLAHOMA EARLY THIS AFTERNOON. THE
THREAT FOR INTENSE SUPERCELLS WILL SPREAD EASTWARD WITH TIME...
REACHING CENTRAL PORTIONS OF OKLAHOMA BY LATE AFTERNOON. THE
SUPERCELL STORMS WILL BE CAPABLE OF VIOLENT AND LONG-TRACK
TORNADOES...EXTREMELY LARGE HAIL...AND DESTRUCTIVE STRAIGHT-LINE
WINDS.

DURING THE EVENING A COLD FRONT WILL MERGE AND OVERTAKE THE DRYLINE.
THIS IS EXPECTED TO AID IN THE DEVELOPMENT OF A SEVERE LINE OF
OF STORMS THAT WILL SWEEP FROM WEST TO EAST LATE THIS EVENING
AND OVERNIGHT. PRIMARY THREATS WILL BE GOLFBALL SIZE HAIL AND
DAMAGING STRAIGHT-LINE WINDS.

PREPARE NOW FOR THREATENING WEATHER CONDITIONS. ENSURE STORM
SHELTERS AND SAFE ROOMS ARE READY IN THE EVENT YOU MUST TAKE COVER
THIS AFTERNOON AND TONIGHT.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT SUNDAY APR 15.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...100 PERCENT.

OTHER HAZARDOUS WEATHER...
STRONG SOUTH WIND TODAY WILL ATTAIN SPEEDS OF 30 MPH WITH FREQUENT
GUSTS OVER 40 MPH AT MOST LOCATIONS. WINDS THIS STRONG CAN TOSS
LIGHT WEIGHT OBJECTS AROUND AND MAKE TRAVEL DIFFICULT FOR LIGHT
WEIGHT AND HIGH PROFILE VEHICLES.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

THUNDERSTORM OUTLOOK...
STRONG AND SEVERE THUNDERSTORMS ARE EXPECTED TO EXIT FAR SOUTHEAST
OKLAHOMA AROUND DAYBREAK SUNDAY. THERE IS ANOTHER CHANCE FOR
THUNDERSTORMS NEXT FRIDAY.

OTHER HAZARDOUS WEATHER...
NONE.

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

In the hours before

Local storm report, Apr 14, 3:56 PM CDT, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
356 PM CDT SAT APR 14 2012

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

0347 PM     HAIL             1 E FORT SUPPLY         36.57N 99.56W
04/14/2012  E1.75 INCH       WOODWARD           OK   TRAINED SPOTTER

&&

FMITCHEL

Special weather statement, Apr 14, 4:06 PM CDT, 35 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
406 PM CDT SAT APR 14 2012

OKZ009-014-142130-
ROGER MILLS OK-ELLIS OK-
406 PM CDT SAT APR 14 2012

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ROGER MILLS AND
SOUTH CENTRAL ELLIS COUNTIES UNTIL 430 PM CDT...

AT 403 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 9 MILES
NORTHWEST OF REYDON...MOVING NORTHEAST AT 65 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

LOCATIONS IMPACTED INCLUDE...
CRAWFORD AND DURHAM.

LAT...LON 3599 9997 3611 9985 3593 9961 3592 9961
      3567 9998 3567 9999 3593 10001
TIME...MOT...LOC 2103Z 214DEG 56KT 3574 10006

30

Local storm report, Apr 14, 4:09 PM CDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
409 PM CDT SAT APR 14 2012

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

0359 PM     HAIL             12 SSE SELMAN           36.64N 99.40W
04/14/2012  E1.75 INCH       HARPER             OK   PUBLIC

&&

FMITCHEL

Local storm report, Apr 14, 4:14 PM CDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
414 PM CDT SAT APR 14 2012

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

0359 PM     TORNADO          7 N WOODWARD            36.53N 99.39W
04/14/2012                   WOODWARD           OK   TRAINED SPOTTER

            BRIEF TOUCHDOWN

&&

FM

Local storm report, Apr 14, 4:21 PM CDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
421 PM CDT SAT APR 14 2012

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

0408 PM     HAIL             15 N WOODWARD           36.65N 99.39W
04/14/2012  E3.00 INCH       HARPER             OK   STORM CHASER

&&

FM

Local storm report, Apr 14, 4:38 PM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
438 PM CDT SAT APR 14 2012

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

0315 PM     HAIL             11 NNE SELMAN           36.95N 99.40W
04/14/2012  E2.75 INCH       WOODS              OK   PUBLIC

&&

FM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 7:10 PM CDT	Special Weather Statement	OUN	Blaine	20 min
Apr 13, 7:25 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Kiowa, Washita	65 min
Apr 13, 7:28 PM CDT	Tornado Warning	OUN	Comanche, Kiowa	32 min
Apr 13, 7:31 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	59 min
Apr 13, 7:36 PM CDT	Special Weather Statement	OUN	Blaine, Custer, Kingfisher	24 min
Apr 13, 7:57 PM CDT	Tornado Warning	OUN	Caddo, Kiowa	33 min
Apr 13, 8:02 PM CDT	Tornado Warning	OUN	Greer, Harmon, Jackson	28 min
Apr 13, 8:06 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher	54 min
Apr 13, 8:11 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa, Washita	64 min
Apr 13, 8:15 PM CDT	Special Weather Statement	OUN	Noble	30 min
Apr 13, 8:25 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Kiowa, Washita	65 min
Apr 13, 8:28 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Greer, Jackson, Kiowa, Tillman	62 min
Apr 13, 8:42 PM CDT	Areal Flood Warning	OUN	Caddo, Comanche, Greer, Jackson, Kiowa	3 hr
Apr 13, 8:44 PM CDT	Tornado Warning	OUN	Caddo, Kiowa	21 min
Apr 13, 9:02 PM CDT	Special Weather Statement	OUN	Kay, Major	28 min
Apr 13, 9:25 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer	65 min
Apr 13, 9:26 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Jackson, Kiowa	51 min
Apr 13, 9:32 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Comanche, Grady, Jackson, Kiowa	58 min
Apr 13, 9:50 PM CDT	Special Weather Statement	OUN	Grant, Kay	25 min
Apr 13, 10:06 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Washita	54 min
Apr 13, 10:16 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	59 min
Apr 13, 10:22 PM CDT	Areal Flood Warning	OUN	Caddo	3 hr
Apr 13, 10:30 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	41 min
Apr 13, 10:54 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Custer, Washita	66 min
Apr 13, 11:09 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain	26 min
Apr 13, 11:13 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	47 min
Apr 13, 11:24 PM CDT	Special Weather Statement	OUN	Roger Mills	36 min
Apr 13, 11:52 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Custer, Washita	53 min
Apr 14, 12:05 AM CDT	Severe Thunderstorm Warning	OUN	Ellis, Woodward	55 min
Apr 14, 12:09 AM CDT	Severe Thunderstorm Warning	OUN	Oklahoma	19 min
Apr 14, 12:22 AM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Lincoln, Logan, Payne	53 min
Apr 14, 12:43 AM CDT	Special Weather Statement	OUN	Oklahoma	32 min
Apr 14, 12:43 AM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Roger Mills	62 min
Apr 14, 12:46 AM CDT	Special Weather Statement	OUN	Garfield, Noble	44 min
Apr 14, 12:53 AM CDT	Special Weather Statement	OUN	Canadian	67 min
Apr 14, 1:16 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher	44 min
Apr 14, 1:23 AM CDT	Special Weather Statement	OUN	Oklahoma	37 min
Apr 14, 1:26 AM CDT	Severe Thunderstorm Warning	OUN	Logan, Oklahoma	64 min
Apr 14, 1:37 AM CDT	Special Weather Statement	OUN	Garfield, Major, Noble	68 min
Apr 14, 1:48 AM CDT	Wind Advisory	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Carter and 40 more	26 hr
Apr 14, 1:58 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher, Logan, Oklahoma	62 min
Apr 14, 2:22 AM CDT	Areal Flood Advisory	OUN	Kingfisher, Logan	113 min
Apr 14, 2:24 AM CDT	Tornado Warning	OUN	Canadian, Logan, Oklahoma	36 min
Apr 14, 2:32 AM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	43 min
Apr 14, 2:41 AM CDT	Tornado Warning	OUN	Logan, Payne	22 min
Apr 14, 2:53 AM CDT	Special Weather Statement	OUN	Garfield, Major	67 min
Apr 14, 2:54 AM CDT	Tornado Warning	OUN	Logan	36 min
Apr 14, 3:25 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	65 min
Apr 14, 4:07 AM CDT	Special Weather Statement	OUN	Garfield	23 min
Apr 14, 4:27 AM CDT	Severe Thunderstorm Warning	OUN	Payne	63 min
Apr 14, 4:29 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Noble	61 min
Apr 14, 5:29 AM CDT	Special Weather Statement	OUN	Noble	46 min
Apr 14, 1:59 PM CDT	Special Weather Statement	OUN	Harper	31 min
Apr 14, 2:21 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper	54 min
Apr 14, 3:01 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Woodward	59 min
Apr 14, 3:10 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	28 min
Apr 14, 3:18 PM CDT	Tornado Warning	OUN	Harper, Woods	27 min
Apr 14, 3:20 PM CDT	Tornado Warning	OUN	Ellis, Woodward	25 min
Apr 14, 3:40 PM CDT	Tornado Warning	OUN	Ellis, Harper, Woodward	35 min
Apr 14, 4:06 PM CDT	Special Weather Statement	OUN	Roger Mills	24 min
Apr 14, 4:10 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills, Woodward	50 min
Apr 14, 4:12 PM CDT	Tornado Warning	OUN	Harper, Woods, Woodward	33 min
Apr 14, 4:43 PM CDT	Tornado Warning	OUN	Woods	20 min
Apr 14, 4:59 PM CDT	Tornado Warning	OUN	Ellis, Woodward	46 min
Apr 14, 5:01 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	44 min
Apr 14, 5:30 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Roger Mills, Woodward	45 min
Apr 14, 5:44 PM CDT	Tornado Warning	OUN	Major, Woods, Woodward	46 min
Apr 14, 6:01 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Woodward	44 min
Apr 14, 6:07 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods, Woodward	21 min
Apr 14, 6:14 PM CDT	Tornado Warning	OUN	Dewey, Woodward	31 min
Apr 14, 6:27 PM CDT	Tornado Warning	OUN	Woods, Woodward	48 min
Apr 14, 6:43 PM CDT	Tornado Warning	OUN	Major, Woods, Woodward	32 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2012 Every severe thunderstorm warning in 2012

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.