Alert archive / Oklahoma / Special Weather Statements in 2012

Special Weather Statement, NWS Norman, OK

March 21, 2012Washita County, Oklahoma

NWS Norman, OK issued this special weather statement at Mar 21, 2012, 1:30 PM CDT for Washita 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: Mar 21, 2012, 1:30 PM CDT (18:30 UTC)
Expired: Mar 21, 2012, 2:00 PM CDT
In force: 30 min
Issued by: NWS Norman, OK

County Washita County, OK

The radar

The Altus AFB radar (KFDR), 93 km from the middle of the area, began a volume at 18:32 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, 6.5 hours before the alert went out and 150 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: 5 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 1007 m above ground
0-6 km bulk shear: 98 kt
0-1 km storm-relative helicity: -26 m²/s²
0-3 km storm-relative helicity: 47 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 Mar 21, 12:32 PM CDT, 58 minutes earlier.

Area forecast discussion, Mar 21, 12:32 PM CDT, 58 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
1232 PM CDT WED MAR 21 2012

.AVIATION...
CLOUDS WILL CONTINUE TO DEVELOP THROUGH THE AFTERNOON
NORTH OF A CLOSED LOW OVER WESTERN NORTH TEXAS. SCATTERED
SHOWERS AND EMBEDDED STORMS ARE ALSO EXPECTED WITH
IMPRESSIVE MID-LEVEL JET EXTENDING FROM EAST TEXAS INTO
CENTRAL OKLAHOMA. STEEP LAPSE RATES AND A LOW FREEZING
LEVEL WILL SUPPORT HAIL WITH THE STRONGER STORMS THIS
AFTERNOON. MAINLY MVFR CEILINGS ARE EXPECTED INTO THE
EARLY EVENING.  PRECIP ACTIVITY MAY BECOME MORE ISOLATED
BY MID TO LATE EVENING.

&&

.PREV DISCUSSION... /ISSUED 1123 AM CDT WED MAR 21 2012/

UPDATE...
DRIER AIR HAS MOVED INTO THE AREA WITH THE SHOWERS ONLY AFFECTING
THE NORTHWEST CORNER AND SOME OF THE EASTERN EDGE OF THE CWA. THE
CLEARING SKIES IS ALSO ALLOWING DESTABILIZATION TO OCCUR ACROSS
THE AREA... ESPECIALLY WITH COOL MID LEVEL TEMPERATURES IN THE
VICINITY OF THE UPPER LOW WADDLING OVER THE AREA. SHORT FUSE
MODELS SHOW SHOWERS/STORMS REDEVELOPING THIS AFTERNOON... AND MAY
SEE SOME STRONG TO PERHAPS SEVERE STORMS WITH HAIL. HAVE LOWERED
POPS IN MOST AREAS SINCE THE AREAL COVERAGE IS EXPECTED TO BE
LOWER THAN EARLIER THIS MORNING EVEN THOUGH PRECIPITATION CHANCES
OVERALL WILL BE RELATIVELY HIGH.

PREV DISCUSSION... /ISSUED 615 AM CDT WED MAR 21 2012/

AVIATION...
12Z TAFS... CEILINGS WILL VARY THROUGHOUT THE TAF PERIOD WITH
MAINLY VFR AND POSSIBLY SOME MVFR CEILINGS. SCATTERED TO
WIDESPREAD SHOWERS AND ISOLATED THUNDERSTORMS WILL BE POSSIBLE AT
SOME TAF SITES THROUGH TONIGHT.

PREV DISCUSSION... /ISSUED 323 AM CDT WED MAR 21 2012/

DISCUSSION...
UPPER LOW CENTERED NEAR WESTERN NORTH TEXAS EARLY THIS MORNING WILL
CONTINUE TO SLOWLY MEANDER OVER THE SOUTHERN PLAINS THROUGH
THURSDAY. THIS SYSTEM WILL BRING A CHANCE OF SHOWERS AND
THUNDERSTORMS TO PARTS OF THE FA THROUGH THURSDAY NIGHT BEFORE THE
UPPER LOW FINALLY LIFTS NORTHEAST OF THE AREA. WITH COLD
TEMPERATURES ALOFT... SOME OF THE STORMS COULD BECOME STRONG TODAY
PRODUCING HAIL.

AFTER THE UPPER LOW EXITS THE REGION... MODELS SHOW MID/UPPER LEVEL
RIDGE INFLUENCING THE AREA THIS WEEKEND. THIS WILL LEAD TO A
RETURN OF WARM TEMPERATURES OVER THE WEEKEND. THE UPPER RIDGE WILL
SHIFT EAST EARLY NEXT WEEK LEADING TO SOUTHWEST FLOW ALOFT. MODELS
SHOW A WEAK FRONT COULD MOVE INTO PARTS OF THE FA AROUND
TUESDAY/WEDNESDAY OF NEXT WEEK AS A SHORTWAVE MOVES ACROSS THE
NORTHERN PLAINS. SHOWERS AND THUNDERSTORMS COULD ALSO BE POSSIBLE
AROUND THIS TIME.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  44  57  42  75 /  50  70  20   0
HOBART OK         40  60  41  75 /  40  40   0   0
WICHITA FALLS TX  45  66  44  80 /  40  40  10   0
GAGE OK           34  59  36  75 /  60  30   0   0
PONCA CITY OK     41  57  42  70 /  60  70  40  10
DURANT OK         48  63  45  75 /  40  60  20   0

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
TX...NONE.
&&

Hazardous weather outlook, Mar 21, 12:04 PM CDT, 1 hour 26 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1204 PM CDT WED MAR 21 2012

OKZ004>048-050>052-TXZ083>090-221200-
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-
1204 PM CDT WED MAR 21 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 SLIGHT RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT
ACROSS PORTIONS OF OKLAHOMA AND WESTERN NORTH TEXAS.

LOCATION...
THE SLIGHT RISK IS SOUTH OF A LINE FROM HOLDENVILLE TO OKLAHOMA CITY
TO OKARCHE TO CLINTON OKLAHOMA... AND EAST OF A LINE FROM CLINTON
TO ALTUS OKLAHOMA TO SEYMOUR TEXAS.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE THIS
AFTERNOON THROUGH THE EARLY EVENING HOURS.

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

DISCUSSION...
SKIES HAVE CLEARED SOMEWHAT ACROSS MUCH OF OKLAHOMA AND NORTH TEXAS
EARLY WEDNESDAY... WHICH WILL ALLOW THE ATMOSPHERE TO BECOME
SLIGHTLY TO MODERATELY UNSTABLE ACROSS PORTIONS OF OKLAHOMA AND
NORTH TEXAS THIS AFTERNOON... ESPECIALLY NEAR THE UPPER-LEVEL STORM
SYSTEM DRIFTING SLOWLY ACROSS SOUTHWEST OKLAHOMA AND WESTERN NORTH
TEXAS. THIS ENVIRONMENT WILL SUPPORT SHOWERS AND THUNDERSTORMS THIS
AFTERNOON AND EVENING... AND THE STRONGEST STORMS WILL BE CAPABLE OF
PRODUCING HAIL UP TO THE SIZE OF GOLF BALLS. THE CHANCE OF STRONG TO
SEVERE STORMS WILL DECREASE QUICKLY DURING THE EARLY TO MID EVENING
HOURS AND THE ATMOSPHERE BECOMES MORE STABLE.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT THURSDAY MAR 22.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...80 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...40 PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

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

THUNDERSTORM OUTLOOK...
ISOLATED THUNDERSTORMS WILL BE POSSIBLE ON THURSDAY AFTERNOON.

OTHER HAZARDOUS WEATHER...
NONE.

In the hours before

Special weather statement, Mar 21, 1:30 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENTNATIONAL WEATHER SERVICE NORMAN OK130 PM
CDT WED MAR 21 2012

OKZ022-023-035-211900-
KIOWA OK-CADDO OK-WASHITA OK-
130 PM CDT WED MAR 21 2012

...SPECIAL WEATHER STATEMENT...

AT 126 PM CDT...A LINE OF THUNDERSTORMS ALONG A LINE EXTENDING FROM
5 MILES WEST OF FORT COBB TO CLOUD CHIEF AND SENTINEL...MOVING
NORTHWEST AT 10 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...

LOCATIONS IMPACTED INCLUDE...
CORDELL...BURNS FLAT...CARNEGIE...MOUNTAIN VIEW...SENTINEL...FORT
COBB...CORN...DILL CITY...CANUTE...EAKLY...GOTEBO...BESSIE...ROCKY...
COLONY...FORT COBB RESERVOIR...ALFALFA...RETROP...CLOUD CHIEF AND
COWDEN.

LAT...LON 3512 9936 3546 9936 3541 9844 3497 9839
      3511 9937
TIME...MOT...LOC 1826Z 143DEG 7KT 3517 9906 3510 9853

Special weather statement, Mar 21, 1:30 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
130 PM CDT WED MAR 21 2012

OKZ022-023-035-211900-
KIOWA OK-CADDO OK-WASHITA OK-
130 PM CDT WED MAR 21 2012

...SPECIAL WEATHER STATEMENT...

AT 126 PM CDT...A LINE OF THUNDERSTORMS ALONG A LINE EXTENDING FROM
5 MILES WEST OF FORT COBB TO CLOUD CHIEF AND SENTINEL...MOVING
NORTHWEST AT 10 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...

LOCATIONS IMPACTED INCLUDE...
CORDELL...BURNS FLAT...CARNEGIE...MOUNTAIN VIEW...SENTINEL...FORT
COBB...CORN...DILL CITY...CANUTE...EAKLY...GOTEBO...BESSIE...ROCKY...
COLONY...FORT COBB RESERVOIR...ALFALFA...RETROP...CLOUD CHIEF AND
COWDEN.

LAT...LON 3512 9936 3546 9936 3541 9844 3497 9839
      3511 9937
TIME...MOT...LOC 1826Z 143DEG 7KT 3517 9906 3510 9853

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 20, 8:11 PM CDT	Special Weather Statement	OUN	Caddo	34 min
Mar 20, 10:37 PM CDT	Special Weather Statement	OUN	Garvin	38 min
Mar 20, 11:22 PM CDT	Special Weather Statement	OUN	Cleveland	23 min
Mar 21, 2:03 PM CDT	Special Weather Statement	OUN	Washita	27 min
Mar 21, 2:14 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson, Stephens	33 min
Mar 21, 2:50 PM CDT	Special Weather Statement	OUN	Caddo	25 min
Mar 21, 3:15 PM CDT	Special Weather Statement	OUN	Kiowa	30 min
Mar 21, 3:16 PM CDT	Special Weather Statement	OUN	Roger Mills	29 min
Mar 21, 3:46 PM CDT	Special Weather Statement	OUN	Jackson	29 min
Mar 21, 4:29 PM CDT	Special Weather Statement	OUN	Jackson	31 min
Mar 21, 4:32 PM CDT	Special Weather Statement	OUN	Canadian, Cleveland, Oklahoma	43 min
Mar 21, 5:13 PM CDT	Special Weather Statement	OUN	Tillman	32 min
Mar 21, 5:21 PM CDT	Special Weather Statement	OUN	Oklahoma	24 min
Mar 21, 5:42 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Oklahoma	63 min
Mar 21, 6:37 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan	38 min
Mar 21, 2:37 PM CDT	Special Weather Statement	OUN	Hardeman	23 min
Mar 21, 4:12 PM CDT	Special Weather Statement	OUN	Wilbarger	33 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.