Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 240, NWS Norman, OK

May 19, 20126 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 19, 2012, 7:28 PM CDT for 6 counties in Oklahoma. It was in force for 62 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 19, 2012, 7:28 PM CDT (00:28 UTC)
Expired: May 19, 2012, 8:30 PM CDT
In force: 62 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Beckham County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Roger Mills County, OK, Washita County, OK

The radar

The Altus AFB radar (KFDR), 151 km from the middle of the area, began a volume at 00:29 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.

What was reported inside it

Time	Report	Where	Remark
May 19, 7:34 PM CDT	HAIL 1	10 S Cheyenne, OK	QUARTER SIZE HAIL FELL FOR AT LEAST 2 MINUTES
May 19, 7:55 PM CDT	HAIL 1.75	4 Nne Elk City, OK
May 19, 8:36 PM CDT	HAIL 1	4 W Stafford, OK

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this severe thunderstorm warning; the first came 6 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
May 19, 3:52 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.5 hours before the alert went out and 179 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.

779 
WUUS54 KOUN 200028
SVROUN
OKC009-011-039-043-129-149-200130-
/O.NEW.KOUN.SV.W.0240.120520T0028Z-120520T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
728 PM CDT SAT MAY 19 2012

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BECKHAM COUNTY IN  OKLAHOMA...
  WEST CENTRAL BLAINE COUNTY IN  OKLAHOMA...
  CUSTER COUNTY IN  OKLAHOMA...
  DEWEY COUNTY IN  OKLAHOMA...
  ROGER MILLS COUNTY IN  OKLAHOMA...
  NORTHWESTERN WASHITA COUNTY IN  OKLAHOMA...

* UNTIL 830 PM CDT

* AT 724 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
  A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING LARGE DAMAGING 
  HAIL UP TO TWO INCHES IN DIAMETER AND DAMAGING WINDS IN EXCESS OF 
  65 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 
  2 MILES WEST OF PUTNAM TO 9 MILES SOUTHEAST OF CHEYENNE...MOVING 
  EAST AT 20 MPH. 

* LOCATIONS IMPACTED INCLUDE...
  ELK CITY...CLINTON...BURNS FLAT...THOMAS...CHEYENNE...ARAPAHO...
  CANUTE...HAMMON...CUSTER CITY...TALOGA...BUTLER...FOSS...OAKWOOD...
  PUTNAM...STRONG CITY...FAY...EAGLE CITY...FOSS RESERVOIR...
  MOOREWOOD AND SWEETWATER. 

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 27 AND 66.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE INSIDE A STURDY BUILDING UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3608 9900 3592 9847 3527 9924 3540 10001
      3543 10000
TIME...MOT...LOC 0024Z 287DEG 18KT 3582 9906 3548 9960 

$$

1 follow-up statement

899 
WWUS54 KOUN 200113
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
813 PM CDT SAT MAY 19 2012

OKC009-011-039-043-129-149-200130-
/O.CON.KOUN.SV.W.0240.000000T0000Z-120520T0130Z/
CUSTER OK-BLAINE OK-BECKHAM OK-WASHITA OK-ROGER MILLS OK-DEWEY OK-
813 PM CDT SAT MAY 19 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM 
CDT FOR CUSTER...WEST CENTRAL BLAINE...BECKHAM...NORTHWESTERN 
WASHITA...ROGER MILLS AND DEWEY COUNTIES...

AT 811 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A 
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING LARGE DAMAGING 
HAIL UP TO GOLF BALL SIZE AND DAMAGING WINDS IN EXCESS OF 65 MPH. 
THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 
PUTNAM TO FOSS RESERVOIR TO BERLIN...MOVING EAST AT 40 MPH. 

LOCATIONS IMPACTED INCLUDE...
ELK CITY...CLINTON...BURNS FLAT...THOMAS...CHEYENNE...ARAPAHO...
CANUTE...HAMMON...CUSTER CITY...TALOGA...BUTLER...FOSS...OAKWOOD...
PUTNAM...STRONG CITY...FAY...EAGLE CITY...FOSS RESERVOIR...
MOOREWOOD AND SWEETWATER. 

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 27 AND 66.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE INSIDE A STURDY BUILDING UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3608 9900 3592 9847 3527 9924 3540 10001
      3543 10000
TIME...MOT...LOC 0111Z 267DEG 36KT 3582 9887 3550 9917 3542 9958 

$$

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 May 19, 6:39 PM CDT, 49 minutes earlier.

Area forecast discussion, May 19, 6:39 PM CDT, 49 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
639 PM CDT SAT MAY 19 2012

.DISCUSSION...
AVIATION DISCUSSION FOR THE 00Z TAFS IS BELOW.

&&

.AVIATION...
MAINLY VFR CONDITIONS ARE EXPECTED AT ALL SITES...THOUGH
CONFIDENCE IS LOW TO MODERATE.

ISO-SCT TSRA WILL AFFECT PARTS OF OKLAHOMA AND MOVE SOUTHEAST...
MAINLY AFFECT KCSM...KPNC...KOKC...KOUN...AND KHBR DURING THE
NEXT SEVERAL HOURS BEFORE WEAKENING BY 12Z. THESE STORMS COULD
BRING BRIEF GUSTY WINDS...HAIL...AND MVFR CONDITIONS IF THEY
DIRECTLY IMPACT A SITE. THINK KOKC WILL BE AFFECTED MAINLY 06-08Z.

THERE IS A LOW CHANCE FOR MVFR OR IFR CONDITIONS ACROSS MUCH OF
THE AREA 09-16Z. ONLY KEPT TEMPO MENTION OF MVFR CONDITIONS AT
KSPS WHERE CONFIDENCE OF THESE LOWER CONDITIONS IS MODERATE.

A FEW SHRA MAY BE LINGER OVER THE AREA AFTER 12Z...SO ADDED VCSH
AT SOME LOCATIONS. A FEW TSRA MAY REDEVELOP AFTER 19Z...BUT DID
NOT MENTION VCTS DUE TO LOW CONFIDENCE OF EXACT LOCATION
AND TIMING.

MBS

&&

.PREV DISCUSSION... /ISSUED 244 PM CDT SAT MAY 19 2012/

DISCUSSION...
COLD FRONT MAKING ITS WAY INTO FAR NORTHWEST OKLAHOMA THIS
AFTERNOON. CONSENSUS OF SHORT-TERM MODELS LEADS TO HIGHER POPS
ACROSS NORTH-CENTRAL OKLAHOMA THIS EVENING INTO CENTRAL OKLAHOMA
LATE TONIGHT AND SUNDAY MORNING. FAIRLY CONFIDENT THAT STORMS WILL
DEVELOP SOUTHWARD FROM KANSAS ALONG FRONTAL BOUNDARY WITH THE
DEVELOPMENT OF OVERNIGHT COMPLEX ACROSS CENTRAL OKLAHOMA A LITTLE
LESS CERTAIN. THERE WILL BE AN INITIAL SEVERE WEATHER POTENTIAL
FOR MUCH OF THE EVENING ACROSS NORTHWEST PARTS OF OKLAHOMA BUT
SEVERE POTENTIAL SHOULD DECREASE AS THE NIGHT PROGRESSES. STORM
CHANCES WILL REMAIN IN THE FORECAST THROUGH AT LEAST MONDAY NIGHT
WITH SURFACE BOUNDARY IN PLACE OVER/NEAR THE REGION AND SUBTLE
S/WVS IN DEVELOPING NORTHWEST FLOW.

UPPER RIDGING EXPECTED TO INCREASE TUESDAY ON SO WILL LEAVE
FORECAST DRY WITH WARMING TREND.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  66  82  62  83 /  60  40  40  30
HOBART OK         64  82  62  85 /  60  30  30  20
WICHITA FALLS TX  67  87  63  88 /  20  30  30  30
GAGE OK           56  76  56  81 /  40  20  20  20
PONCA CITY OK     63  79  59  80 /  50  50  30  10
DURANT OK         66  88  63  86 /  10  20  20  30

&&

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

03/17/17

Hazardous weather outlook, May 19, 11:30 AM CDT, 7 hours 58 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1130 AM CDT SAT MAY 19 2012

OKZ004>048-050>052-TXZ083>090-201000-
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-
1130 AM CDT SAT MAY 19 2012

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT
ACROSS PORTIONS OF NORTHERN AND WESTERN OKLAHOMA AND WESTERN NORTH
TEXAS.

LOCATION...
THE RISK AREA IS NEAR AND NORTHWEST OF A LINE FROM PONCA CITY
TO EL RENO TO FREDERICK OKLAHOMA TO VERNON AND BENJAMIN TEXAS.

TIMING...
THE MOST LIKELY TIME FOR SEVERE WEATHER IS FROM 4 PM
THROUGH MIDNIGHT.

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

IMPACTS...
HAIL LARGER THAN GOLF BALLS CAN CAUSE DAMAGE TO ROOFS...CROPS AND
CARS. THUNDERSTORM WINDS OVER 65 MPH MAY CAUSE DAMAGE TO
STRUCTURES... TREES AND UTILITY LINES.

DISCUSSION...
ISOLATED TO WIDELY SCATTERED THUNDERSTORMS ARE EXPECTED
TO DEVELOP ALONG A COLD FRONT IN NORTHWEST OKLAHOMA THIS AFTERNOON.
SUFFICIENT INSTABILITY AND DEEP LAYER SHEAR AHEAD OF THE FRONT...WILL
SUPPORT THE DEVELOPMENT OF SUPERCELL THUNDERSTORMS.  ADDITIONAL
THUNDERSTORMS ARE EXPECTED TO DEVELOP AS THE COLD FRONT MOVES
SLOWLY SOUTH DURING THE EVENING AND OVERNIGHT HOURS.  THUNDERSTORMS
WILL PERSIST OVERNIGHT AND CONTINUE TO SPREAD FARTHER
SOUTHEAST... HOWEVER THE CHANCE OF SEVERE WEATHER WILL DECREASE OVERNIGHT.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT SUNDAY MAY 20.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...90 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...60 PERCENT.

OTHER HAZARDOUS WEATHER...
GUSTY SOUTH WINDS ARE EXPECTED ACROSS MOST OF THE AREA TODAY. THIS
WILL MAKE FOR DIFFICULT DRIVING CONDITIONS... ESPECIALLY ON EAST
WEST ROADWAYS FOR HIGH PROFILE VEHICLES.

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

THUNDERSTORM OUTLOOK...
THUNDERSTORMS CHANCES WILL PERSIST SUNDAY AND MONDAY AS THE COLD
FRONT MOVES SLOWLY SOUTHEAST THROUGH THE AREA. THE RISK OF SEVERE
WEATHER IS RELATIVELY LOW.

OTHER HAZARDOUS WEATHER...
NONE.

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

In the hours before

Special weather statement, May 19, 4:43 PM CDT, 2 hours 45 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
443 PM CDT SAT MAY 19 2012

OKZ009-010-014-192215-
ROGER MILLS OK-WOODWARD OK-ELLIS OK-
443 PM CDT SAT MAY 19 2012

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ROGER MILLS...
SOUTHWESTERN WOODWARD AND ELLIS COUNTIES UNTIL 515 PM CDT...

AT 441 PM CDT...RADAR INDICATED WIDELY SCATTERED THUNDERSTORMS
FROM DURHAM TO ARNETT TO HARMON AND SHARON.  STORM INTENSITY IS
INCREASING AND WARNINGS MAY BE REQUIRED.  THE STORMS WERE
MOVING NORTHEAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE... ARNETT...SHARON...DURHAM AND HARMON.

LAT...LON 3608 10000 3643 9932 3633 9913 3570 10000
TIME...MOT...LOC 2141Z 241DEG 27KT 3609 9969

Local storm report, May 19, 6:19 PM CDT, 1 hour 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
619 PM CDT SAT MAY 19 2012

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

0528 PM     HAIL             SHARON                  36.28N 99.34W
05/19/2012  E1.00 INCH       WOODWARD           OK   PUBLIC

&&

RBARNES

Local storm report, May 19, 6:23 PM CDT, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
623 PM CDT SAT MAY 19 2012

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

0619 PM     HAIL             6 N ANGORA              35.92N 99.45W
05/19/2012  E1.75 INCH       ROGER MILLS        OK   PUBLIC

&&

RBARNES

Local storm report, May 19, 6:52 PM CDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
652 PM CDT SAT MAY 19 2012

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

0648 PM     HAIL             7 NNE LEEDEY            35.96N 99.30W
05/19/2012  E1.00 INCH       DEWEY              OK   PUBLIC

&&

JPIKE

The office that day

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

Issued	Product	Office	Counties	Lasted
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, 5:30 AM CDT	Special Weather Statement	OUN	Caddo	30 min
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

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.