Alert archive / Oklahoma / Special Weather Statements in 2012

Special Weather Statement, NWS Norman, OK

May 20, 2012Caddo County, Oklahoma

NWS Norman, OK issued this special weather statement at May 20, 2012, 5:30 AM CDT for Caddo County, Oklahoma. It was in force for 30 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: May 20, 2012, 5:30 AM CDT (10:30 UTC)
Expired: May 20, 2012, 6:00 AM CDT
In force: 30 min
Issued by: NWS Norman, OK

County Caddo County, OK

The radar

The Norman radar (KTLX), 95 km from the middle of the area, began a volume at 10:33 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 00:00Z, 10.5 hours before the alert went out and 81 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: 539 J/kg
Mixed-layer CIN: -464 J/kg
Mixed-layer LCL: 1944 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 211 m²/s²
0-3 km storm-relative helicity: 337 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.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at May 20, 3:53 AM CDT, 1 hour 37 minutes earlier.

Area forecast discussion, May 20, 3:53 AM CDT, 1 hour 37 minutes before

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Hazardous weather outlook, May 20, 4:45 AM CDT, 45 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
445 AM CDT SUN MAY 20 2012

OKZ004>048-050>052-TXZ083>090-201700-
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-
445 AM CDT SUN MAY 20 2012

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

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

THUNDERSTORM OUTLOOK...
A FEW MARGINALLY SEVERE THUNDERSTORMS WILL BE POSSIBLE ACROSS
OKLAHOMA AND WESTERN NORTH TEXAS DURING THE DAY ON SUNDAY.

DISCUSSION...
A COLD FRONT WILL CONTINUE TO MOVE SLOWLY SOUTHEAST ACROSS
PORTIONS OF OKLAHOMA AND WESTERN NORTH TEXAS TODAY AND TONIGHT.
THIS FRONT WILL BE A FOCUS FOR SCATTERED SHOWERS AND THUNDERSTORMS
THROUGH THE DAY TODAY. WITH AFTERNOON HEATING... ENOUGH INSTABILITY MAY
DEVELOP FOR A FEW STRONG STORMS TO DEVELOP ACROSS PORTIONS OF
CENTRAL AND SOUTHERN OKLAHOMA INTO NORTH TEXAS. THE STRONGEST STORMS
MAY BE CAPABLE OF MARGINALLY SEVERE HAIL AND GUSTY WINDS. HOWEVER
ORGANIZED SEVERE WEATHER IS NOT ANTICIPATED.

PROBABILITY TABLE... VALID THROUGH 700 AM CDT MONDAY MAY 21.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...20 PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...

THUNDERSTORM OUTLOOK...
THUNDERSTORMS CHANCES WILL PERSIST MONDAY AS THE FRONT STALLS ACROSS
SOUTHERN OKLAHOMA DURING THE DAY ON MONDAY AND THEN BEGINS TO RETREAT
BACK TO THE NORTH MONDAY NIGHT. THE RISK OF SEVERE WEATHER IS
RELATIVELY LOW.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AROUND NOON
TODAY.

In the hours before

Local storm report, May 20, 3:59 AM CDT, 1 hour 31 minutes before

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Special weather statement, May 20, 4:08 AM CDT, 1 hour 22 minutes before

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Special weather statement, May 20, 4:28 AM CDT, 1 hour 2 minutes before

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Special weather statement, May 20, 4:35 AM CDT, 55 minutes before

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Special weather statement, May 20, 5:03 AM CDT, 27 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
503 AM CDT SUN MAY 20 2012

OKZ023-027-201030-
CADDO OK-GRADY OK-
503 AM CDT SUN MAY 20 2012

...SIGNIFICANT WEATHER ADVISORY FOR CADDO AND WEST CENTRAL GRADY
COUNTIES UNTIL 530 AM CDT...

AT 501 AM CDT...STRONG THUNDERSTORMS WERE LOCATED NEAR ANADARKO...
AND 5 MILES SOUTHWEST OF FORT COBB. THE STORMS WERE MOVING EAST
AT 30 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 40 MPH...

LOCATIONS IMPACTED INCLUDE...
ANADARKO...VERDEN...CEMENT...NORGE...LAKE CHICKASHA...STECKER AND
LAVERTY.

LAT...LON 3517 9804 3494 9798 3491 9856 3506 9859
TIME...MOT...LOC 1001Z 255DEG 25KT 3501 9830

Special weather statement, May 20, 5:30 AM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
530 AM CDT SUN MAY 20 2012

OKZ023-027-201100-
CADDO OK-GRADY OK-
530 AM CDT SUN MAY 20 2012

...SIGNIFICANT WEATHER ADVISORY FOR CADDO AND NORTHWESTERN GRADY
COUNTIES UNTIL 600 AM CDT...

AT 525 AM CDT...STRONG THUNDERSTORMS WERE ALONG A LINE EXTENDING
FROM LAKE CHICKASHA TO 6 MILES NORTHWEST OF BOONE...MOVING
NORTHEAST AT 15 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 40 MPH...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

LOCATIONS IMPACTED INCLUDE...
CHICKASHA...ANADARKO...VERDEN...POCASSET...NORGE...BOONE...LAKE
CHICKASHA...STECKER AND LAVERTY.

LAT...LON 3512 9827 3525 9791 3497 9794 3486 9861
      3502 9862
TIME...MOT...LOC 1025Z 243DEG 14KT 3511 9813 3498 9854

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 7:28 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Blaine, Custer, Dewey, Roger Mills, Washita	62 min
May 19, 7:38 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major, Woodward	30 min
May 19, 8:28 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Dewey, Roger Mills, Washita	62 min
May 19, 8:50 PM CDT	Severe Thunderstorm Warning	OUN	Grant	40 min
May 19, 9:03 PM CDT	Special Weather Statement	OUN	Woodward	27 min
May 19, 9:16 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Kiowa, Washita	59 min
May 19, 9:23 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	56 min
May 19, 9:27 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Blaine, Caddo, Custer, Washita	63 min
May 19, 9:37 PM CDT	Special Weather Statement	OUN	Harmon	23 min
May 19, 10:08 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	67 min
May 19, 10:16 PM CDT	Special Weather Statement	OUN	Harmon	29 min
May 19, 10:23 PM CDT	Special Weather Statement	OUN	Major	37 min
May 19, 10:41 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa, Washita	54 min
May 19, 10:47 PM CDT	Special Weather Statement	OUN	Caddo	28 min
May 19, 11:07 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	53 min
May 19, 11:19 PM CDT	Special Weather Statement	OUN	Caddo	26 min
May 19, 11:26 PM CDT	Special Weather Statement	OUN	Kiowa	34 min
May 19, 11:50 PM CDT	Special Weather Statement	OUN	Caddo	25 min
May 19, 11:54 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	47 min
May 20, 12:13 AM CDT	Special Weather Statement	OUN	Caddo	32 min
May 20, 12:20 AM CDT	Special Weather Statement	OUN	Washita	25 min
May 20, 12:28 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	36 min
May 20, 12:38 AM CDT	Severe Thunderstorm Warning	OUN	Washita	67 min
May 20, 12:48 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Oklahoma	57 min
May 20, 1:21 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie	37 min
May 20, 1:44 AM CDT	Special Weather Statement	OUN	Kiowa	31 min
May 20, 1:59 AM CDT	Special Weather Statement	OUN	Pottawatomie, Seminole	31 min
May 20, 2:07 AM CDT	Special Weather Statement	OUN	Grady	38 min
May 20, 2:42 AM CDT	Special Weather Statement	OUN	Caddo, Grady	48 min
May 20, 3:15 AM CDT	Special Weather Statement	OUN	Garvin	30 min
May 20, 3:34 AM CDT	Special Weather Statement	OUN	Grady	41 min
May 20, 3:35 AM CDT	Special Weather Statement	OUN	Garvin	25 min
May 20, 4:08 AM CDT	Special Weather Statement	OUN	Seminole	37 min
May 20, 4:28 AM CDT	Special Weather Statement	OUN	Garvin	32 min
May 20, 4:35 AM CDT	Special Weather Statement	OUN	Seminole	25 min
May 20, 5:03 AM CDT	Special Weather Statement	OUN	Caddo	27 min
May 20, 5:18 AM CDT	Areal Flood Advisory	OUN	Caddo, Grady	3 hr
May 20, 8:23 AM CDT	Special Weather Statement	OUN	Stephens	37 min
May 20, 9:03 AM CDT	Special Weather Statement	OUN	Carter	27 min
May 20, 10:13 AM CDT	Special Weather Statement	OUN	Canadian	32 min
May 20, 10:55 AM CDT	Special Weather Statement	OUN	Oklahoma	35 min
May 20, 11:22 AM CDT	Special Weather Statement	OUN	Canadian	38 min
May 20, 4:00 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	45 min
May 20, 4:39 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	42 min
May 20, 3:33 PM CDT	Special Weather Statement	OUN	Wilbarger	42 min
May 20, 4:57 PM CDT	Severe Thunderstorm Warning	OUN	Wichita, Wilbarger	48 min
May 20, 5:36 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Wichita, Wilbarger	33 min
May 20, 5:44 PM CDT	Special Weather Statement	OUN	Baylor	46 min
May 20, 5:48 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor, Wilbarger	42 min
May 20, 6:30 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor	13 min

Nearby

Special Weather Statements in Oklahoma, 2012 Every special weather statement 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.