Alert archive / Oklahoma / Tornado Warnings in 2011

Tornado Warning 29, NWS Norman, OK

May 19, 2011Caddo County, Oklahoma

NWS Norman, OK issued this tornado warning at May 19, 2011, 6:27 PM CDT for Caddo County, Oklahoma. It was in force for 33 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 19, 2011, 6:27 PM CDT (23:27 UTC)
Expired: May 19, 2011, 7:00 PM CDT
In force: 33 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

County Caddo County, OK

The radar

The Norman radar (KTLX), 90 km from the middle of the area, began a volume at 23:27 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this tornado warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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, 12:46 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.5 hours before the alert went out and 77 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: 1483 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 616 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 219 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

519 
WFUS54 KOUN 192327
TOROUN
OKC015-200000-
/O.NEW.KOUN.TO.W.0029.110519T2327Z-110520T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
627 PM CDT THU MAY 19 2011

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL CADDO COUNTY IN SOUTHWEST OKLAHOMA...

* UNTIL 700 PM CDT

* AT 626 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 6 MILES SOUTHWEST OF   
GRACEMONT...MOVING EAST AT 25 MPH. SPOTTERS CONTINUE TO OBSERVE A 
FUNNEL CLOUD IN THIS AREA AND RADAR SHOWS STRONG CIRCULATION. A 
TORNADO MAY DEVELOP AT ANY TIME.   

* LOCATIONS IN THE WARNING INCLUDE ALBERT...COGAR...EASTERN FORT COBB
  RESERVOIR...FORT COBB...GRACEMONT AND LAKE CHICKASHA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO MAY FORM AT ANYTIME. TAKE COVER NOW. ABANDON MOBILE HOMES
AND VEHICLES. IF POSSIBLE... MOVE TO A BASEMENT OR STORM SHELTER.
OTHERWISE... MOVE TO AN INTERIOR ROOM OR HALLWAY ON THE LOWEST FLOOR.
STAY AWAY FROM WINDOWS.

&&

LAT...LON 3534 9813 3510 9809 3504 9843 3522 9848
TIME...MOT...LOC 2326Z 255DEG 23KT 3516 9834

$$

1 follow-up statement

715 
WWUS54 KOUN 192357
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
657 PM CDT THU MAY 19 2011

OKC015-200006-
/O.EXP.KOUN.TO.W.0029.000000T0000Z-110520T0000Z/
CADDO OK-
657 PM CDT THU MAY 19 2011

...THE TORNADO WARNING FOR CENTRAL CADDO COUNTY WILL EXPIRE AT 700 PM
CDT...

RADAR SHOWS THAT THE CIRCULATION WITH THIS STORM HAS WEAKENED. AS A 
RESULT...THE TORNADO WARNING WILL BE ALLOWED TO EXPIRE. 
HOWEVER...SEVERE THUNDERSTORMS WILL CONTINUE TO MOVE THROUGH CADDO 
COUNTY AND ADDITIONAL WARNINGS MAY BE ISSUED. 

LAT...LON 3534 9813 3510 9809 3504 9843 3522 9848
TIME...MOT...LOC 2356Z 254DEG 19KT 3522 9818

$$

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at May 19, 5:34 PM CDT, 53 minutes earlier.

Area forecast discussion, May 19, 5:34 PM CDT, 53 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
534 PM CDT THU MAY 19 2011

.AVIATION...
0Z TAFS... RAIN AND THUNDERSTORMS ARE EXPECTED TO MOVE ACROSS
CENTRAL OKLAHOMA THIS EVENING. MVFR CEILINGS ARE EXPECTED OVERNGHT
IN NEARLY ALL OF WESTERN AND CENTRAL OKLAHOMA. THESE WILL LAST
MUCH OF THE DAY FRIDAY IN CENTRAL OKLAHOMA, BUT CEILINGS ARE
EXPECTED TO DISSIPATE IN WESTERN OKLAHOMA BEHIND A DRYLINE FRIDAY
AFTERNOON. SHOWERS AND THUNDERSTORMS WILL BE COMMON FRIDAY
AFTERNOON.

&&

.PREV DISCUSSION... /ISSUED 222 PM CDT THU MAY 19 2011/

DISCUSSION...
THE BEGINNING OF A ACTIVE PERIOD HAS BEGUN THIS AFTN AS STORMS HAVE
DEVELOPED THIS AFTN NEAR THE DRYLINE ACROSS WESTERN OK/WESTERN NORTH
TX. EXPECT ADDITIONAL ACTIVITY TO DEVELOP THROUGH THE AFTN ACROSS
WESTERN SECTIONS AND THEN POSSIBLY MORE WIDESPREAD ACTIVITY
OVERNIGHT INTO CENTRAL SECTIONS OF OKLAHOMA... AND THEN PERHAPS
FARTHER EAST FRIDAY MORNING.

ANOTHER ACTIVE DAY EXPECTED ON FRIDAY... HOWEVER A LOT OF WHAT
OCCURS TOMORROW WILL DEPEND ON LATE TONIGHT. A STRONGER PUSH FROM
ALOFT MAY PUSH THINGS FURTHER EAST FOR SATURDAY INTO SUNDAY... BUT
MAIN SFC FRONT WILL REMAIN TO THE NORTH WITH LOW LEVEL MOISTURE
HANGING AROUND. THIS WILL SET THE STAGE FOR ADDITIONAL SHOWER/TSTM
ACTIVITY EARLY/TO MID PART OF NEXT WEEK.

A STRONGER SFC FRONT STILL APPEARS THAT IT WILL MOVE SOUTHEAST
ACROSS OKLAHOMA AND NORTH TEXAS ON WEDNESDAY. THIS WILL LIKELY BRING
SOME DRIER/COOLER AIR INTO THE AREA FOR LATTER HALF OF NEXT WEEK.

&

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  68  77  65  83 /  60  60  40   0
HOBART OK         65  85  61  92 /  40  40  20   0
WICHITA FALLS TX  70  84  67  96 /  50  50  30   0
GAGE OK           54  79  50  87 /  30  10  20   0
PONCA CITY OK     67  78  62  79 /  50  60  60  10
DURANT OK         70  78  67  83 /  60  60  60  20

&&

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

25/09/01

Hazardous weather outlook, May 19, 11:55 AM CDT, 6 hours 32 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1155 AM CDT THU MAY 19 2011

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-
1155 AM CDT THU MAY 19 2011

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 SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON
THROUGH THE MID TO LATE EVENING.

LOCATION...
THE SLIGHT RISK AREA IS GENERALLY ALONG AND WEST OF INTERSTATE 35
TO THE OKLAHOMA AND TEXAS BORDER.  THE SLIGHT RISK AREA INCLUDES
WESTERN NORTH TEXAS.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE FROM 3 PM
UNTIL MIDNIGHT.

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

DISCUSSION...
A DRYLINE NEAR THE TEXAS AND OKLAHOMA BORDER IS EXPECTED
TO AID IN THUNDERSTORM DEVELOPMENT BY THE MID AFTERNOON
HOURS.  EAST OF THE DRYLINE... THE AIRMASS WILL BE MOIST AND
MODERATELY UNSTABLE. MEANWHILE... A LARGE UPPER LEVEL STORM SYSTEM
TO THE WEST WILL ADVANCE SLOWLY EAST THROUGH TONIGHT. THE STORM
SYSTEM WILL PROVIDE SUFFICIENT VERTICAL WIND SHEAR OVER THE REGION
TO SUPPORT SEVERE THUNDERSTORMS INCLUDING SUPERCELLS.

THUNDERSTORMS THIS AFTERNOON MAY BECOME MORE NUMEROUS DURING
THE EVENING HOURS AS THEY MOVE NORTHEAST TOWARD CENTRAL PARTS OF
OKLAHOMA.  ADDITIONAL THUNDERSTORMS MAY FORM ACROSS PARTS OF WEST
TEXAS LATE TONIGHT AS THE UPPER LEVEL TROUGH MOVES CLOSER TO THE
SOUTHERN PLAINS.  SOME OF THESE STORMS MAY PRODUCE SEVERE WEATHER AS
THEY DEVELOP AND MOVE INTO WESTERN PARTS OF OKLAHOMA AND WESTERN
NORTH TEXAS...SUCH AS LARGE HAIL AND DAMAGING WINDS.

THE PRIMARY SEVERE WEATHER THREATS WILL BE LARGE HAIL TO THE SIZE OF
TENNIS BALLS AND STRONG WINDS TO NEAR 65 MPH. AN ISOLATED TORNADO
WILL ALSO BE POSSIBLE MAINLY THIS AFTERNOON AND EVENING.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT FRIDAY 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...
NONE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

THUNDERSTORM OUTLOOK...
A SLIGHT RISK OF SEVERE STORMS WILL PERSIST THROUGH FRIDAY AS
WIDESPREAD RAIN AND EMBEDDED THUNDERSTORMS CONTINUE IN ADVANCE OF
THE UPPER LEVEL STORM SYSTEM. MOST OF THE THUNDERSTORM ACTIVITY WILL
BE LOCATED EAST OF A DRYLINE THAT WILL AGAIN BE LOCATED ACROSS FAR
WESTERN PORTIONS OF OKLAHOMA AND NORTH TEXAS.

THUNDERSTORM CHANCES WILL BE RELATIVELY SMALL ACROSS THE AREA OVER
THE WEEKEND BEFORE INCREASING ONCE AGAIN TUESDAY AND WEDNESDAY AS
ANOTHER STORM SYSTEM MOVES IN FROM THE WEST.

OTHER HAZARDOUS WEATHER...
NONE.

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

SIX/CJS

In the hours before

Special weather statement, May 19, 4:41 PM CDT, 1 hour 46 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
441 PM CDT THU MAY 19 2011

TXZ084-192200-
FOARD TX-
441 PM CDT THU MAY 19 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR FOARD COUNTY.

AT 441 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 10 MILES SOUTH OF
CROWELL...MOVING NORTHEAST AT 35 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH...
WIND GUSTS TO 40 MPH...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

LAT...LON 3408 9973 3402 9950 3382 9969 3381 9970
      3384 9990

30

Local storm report, May 19, 4:46 PM CDT, 1 hour 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
446 PM CDT THU MAY 19 2011

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

0439 PM     HAIL             3 N COOPERTON           34.91N 98.88W
05/19/2011  E1.00 INCH       KIOWA              OK   TRAINED SPOTTER

            HWYS 19/54

&&

DW

Local storm report, May 19, 4:57 PM CDT, 1 hour 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
457 PM CDT THU MAY 19 2011

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

0449 PM     HAIL             10 ENE COOPERTON        34.92N 98.71W
05/19/2011  E2.75 INCH       KIOWA              OK   AMATEUR RADIO

            HWYS 115/19

&&

DW

Special weather statement, May 19, 5:11 PM CDT, 1 hour 16 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
511 PM CDT THU MAY 19 2011

TXZ083>085-192230-
HARDEMAN TX-WILBARGER TX-FOARD TX-
511 PM CDT THU MAY 19 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR FOARD...HARDEMAN AND
WILBARGER COUNTIES.

AT 511 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 4 MILES WEST OF
THALIA...MOVING NORTHEAST AT 30 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH...
WIND GUSTS TO 40 MPH...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

LAT...LON 3420 9961 3415 9928 3390 9956 3402 9972

30

Local storm report, May 19, 5:21 PM CDT, 1 hour 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
521 PM CDT THU MAY 19 2011

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

0510 PM     HAIL             9 NW BOONE              34.99N 98.58W
05/19/2011  E1.75 INCH       CADDO              OK   AMATEUR RADIO

            REPORT VIA HAM RADIO.

&&

BAIN

Local storm report, May 19, 5:35 PM CDT, 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
535 PM CDT THU MAY 19 2011

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

0533 PM     HAIL             3 W LOCKETT             34.08N 99.42W
05/19/2011  E1.00 INCH       WILBARGER          TX   PUBLIC

&&

BAIN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 4:51 AM CDT	Red Flag Warning	OUN	Beckham, Greer, Harmon, Jackson, Kiowa	6 hr
May 19, 12:39 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	66 min
May 19, 1:00 PM CDT	Special Weather Statement	OUN	Beckham	30 min
May 19, 1:01 PM CDT	Special Weather Statement	OUN	Greer, Harmon	29 min
May 19, 1:07 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills, Washita	38 min
May 19, 1:20 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon	40 min
May 19, 1:43 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Roger Mills	47 min
May 19, 1:48 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	57 min
May 19, 1:57 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon, Kiowa, Washita	48 min
May 19, 2:30 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey, Roger Mills	45 min
May 19, 2:42 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson, Kiowa	48 min
May 19, 2:48 PM CDT	Special Weather Statement	OUN	Roger Mills	27 min
May 19, 3:16 PM CDT	Severe Thunderstorm Warning	OUN	Dewey	44 min
May 19, 3:17 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods, Woodward	43 min
May 19, 3:31 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa, Washita	44 min
May 19, 3:57 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major, Woodward	19 min
May 19, 4:08 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Jackson, Kiowa, Washita	52 min
May 19, 4:25 PM CDT	Tornado Warning	OUN	Caddo, Comanche, Kiowa	35 min
May 19, 4:37 PM CDT	Special Weather Statement	OUN	Jackson	23 min
May 19, 5:01 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Jackson, Kiowa, Washita	44 min
May 19, 5:09 PM CDT	Tornado Warning	OUN	Caddo, Kiowa	36 min
May 19, 5:29 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	31 min
May 19, 5:38 PM CDT	Areal Flood Advisory	OUN	Greer, Jackson, Kiowa	3 hr
May 19, 5:43 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Jackson, Kiowa, Washita	62 min
May 19, 5:57 PM CDT	Tornado Warning	OUN	Caddo, Comanche, Kiowa	33 min
May 19, 5:59 PM CDT	Tornado Warning	OUN	Caddo	31 min
May 19, 6:11 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	49 min
May 19, 6:46 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady	44 min
May 19, 6:54 PM CDT	Areal Flood Advisory	OUN	Caddo, Kiowa	3 hr
May 19, 6:57 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	63 min
May 19, 6:59 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	31 min

Nearby

Tornado Warnings in Oklahoma, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.