Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 191, NWS Norman, OK

May 19, 20114 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 19, 2011, 8:18 PM CDT for 4 counties in Oklahoma. It was in force for 42 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, 8:18 PM CDT (01:18 UTC)
Expired: May 19, 2011, 9:00 PM CDT
In force: 42 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Caddo County, OK, Canadian County, OK, Comanche County, OK, Grady County, OK

The radar

The Norman radar (KTLX), 76 km from the middle of the area, began a volume at 01:18 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 severe thunderstorm 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 00:00Z, 1.3 hours before the alert went out and 63 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: 2115 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 678 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 252 m²/s²
0-3 km storm-relative helicity: 263 m²/s²
Significant tornado parameter: 2.4
Supercell composite: 8.0

Open this sounding in Storm Lab

The text

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

467 
WUUS54 KOUN 200118
SVROUN
OKC015-017-031-051-200200-
/O.NEW.KOUN.SV.W.0191.110520T0118Z-110520T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
818 PM CDT THU MAY 19 2011

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CANADIAN COUNTY IN CENTRAL OKLAHOMA...
  NORTHWESTERN GRADY COUNTY IN CENTRAL OKLAHOMA...
  SOUTHEASTERN CADDO COUNTY IN SOUTHWEST OKLAHOMA...
  NORTHEASTERN COMANCHE COUNTY IN SOUTHWEST OKLAHOMA...

* UNTIL 900 PM CDT

* AT 818 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED SEVERE
  THUNDERSTORMS ALONG A LINE EXTENDING FROM 4 MILES WEST OF VERDEN TO
  3 MILES WEST OF FLETCHER...MOVING NORTHEAST AT 25 MPH.

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF QUARTERS...
WIND GUSTS TO 60 MPH...

* LOCATIONS IN THE WARNING INCLUDE ANADARKO...APACHE...CEMENT...
  COGAR...CYRIL...FLETCHER...GRACEMONT...LAKE CHICKASHA...LAKE
  ELLSWORTH...LAVERTY...MINCO...POCASSET...STECKER...UNION CITY AND
  VERDEN.

THIS INCLUDES INTERSTATE 44 BETWEEN MILE MARKERS 56 AND 71.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH NO ADVANCE WARNING.
MOVE IMMEDIATELY TO A STORM SHELTER... BASEMENT OR STURDY BUILDING IF
A TORNADO IS SIGHTED.

&&

LAT...LON 3545 9786 3482 9807 3477 9846 3530 9821
TIME...MOT...LOC 0118Z 241DEG 20KT 3509 9813 3483 9826

$$

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, 5:34 PM CDT, 2 hours 44 minutes earlier.

Area forecast discussion, May 19, 5:34 PM CDT, 2 hours 44 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, 6:45 PM CDT, 1 hour 33 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
645 PM 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-
645 PM CDT THU MAY 19 2011

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

.DAY ONE...TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS TONIGHT.

LOCATION...
THE SLIGHT RISK AREA IS THAT PART OF OKLAHOMA AND NORTH TEXAS WEST
OF A LINE FROM STILLWATER TO ARDMORE.

TIMING...
UNTIL 3 AM.

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

DISCUSSION...
AN APPROACHING UPPER STORM WILL PROVIDE SUFFICIENT VERTICAL
WIND SHEAR OVER THE REGION TO SUPPORT SEVERE THUNDERSTORMS INCLUDING
SUPERCELLS. LOW-LEVEL MOISTURE AND FAVORABLE WIND NEAR THE SURFACE
WILL HELP SUSTAIN SEVERE THUNDERSTORMS THROUGH THE EVENING.

THE PRIMARY SEVERE WEATHER THREATS WILL BE LARGE HAIL TO THE SIZE OF
TENNIS BALLS AND WIND GUSTS TO NEAR 65 MPH. TORNADOES ARE ALSO POSSIBLE.

AFTER MIDNIGHT A SECOND WAVE OF THUNDERSTORMS MAY DEVELOP IN
NORTHWEST OKLAHOMA AS THE UPPER STORM PASSES ACROSS THIS PART OF THE
STATE. LARGE HAIL IS THE MAIN THREAT FROM THESE THUNDERSTORMS.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT FRIDAY MAY 20.
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...
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

Local storm report, May 19, 5:35 PM CDT, 2 hours 43 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

Local storm report, May 19, 6:28 PM CDT, 1 hour 50 minutes before

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

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

0615 PM     HAIL             VERNON                  34.15N 99.28W
05/19/2011  E1.00 INCH       WILBARGER          TX   PUBLIC

            DELAYED REPORT FROM THE PUBLIC.

&&

BAIN

Local storm report, May 19, 6:35 PM CDT, 1 hour 43 minutes before

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

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

0620 PM     TSTM WND GST     FORT COBB               35.10N 98.44W
05/19/2011  M59 MPH          CADDO              OK   MESONET

&&

BAIN

Local storm report, May 19, 7:08 PM CDT, 1 hour 10 minutes before

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

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

0707 PM     HAIL             VERNON                  34.15N 99.28W
05/19/2011  E1.75 INCH       WILBARGER          TX   TRAINED SPOTTER

&&

DW

Local storm report, May 19, 7:37 PM CDT, 41 minutes before

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

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

0725 PM     HAIL             1 N DAVIDSON            34.26N 99.08W
05/19/2011  E1.75 INCH       TILLMAN            OK   AMATEUR RADIO

&&

DW

Local storm report, May 19, 7:51 PM CDT, 27 minutes before

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

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

0750 PM     HAIL             3 W TUTTLE              35.29N 97.87W
05/19/2011  E1.00 INCH       GRADY              OK   AMATEUR RADIO

&&

BAIN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 7:27 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Comanche, Grady, Kiowa	48 min
May 19, 7:38 PM CDT	Tornado Warning	OUN	Tillman	52 min
May 19, 8:08 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	52 min
May 19, 8:29 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	46 min
May 19, 8:38 PM CDT	Special Weather Statement	OUN	Garfield, Grant, Kingfisher	22 min
May 19, 8:43 PM CDT	Areal Flood Advisory	OUN	Caddo, Canadian, Grady	3 hr
May 19, 8:58 PM CDT	Special Weather Statement	OUN	Garfield, Grant, Kay, Noble	62 min
May 19, 9:06 PM CDT	Special Weather Statement	OUN	Grady	24 min
May 19, 9:14 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	61 min
May 19, 9:43 PM CDT	Special Weather Statement	OUN	Grady	32 min
May 19, 9:58 PM CDT	Special Weather Statement	OUN	Kay, Noble	32 min
May 19, 10:11 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Garvin, Grady, Jefferson, Stephens and 1 more	64 min
May 19, 10:20 PM CDT	Areal Flood Advisory	OUN	Comanche, Cotton	3 hr
May 19, 10:26 PM CDT	Special Weather Statement	OUN	Grady, Oklahoma	34 min
May 19, 10:28 PM CDT	Special Weather Statement	OUN	Harmon	32 min
May 19, 10:45 PM CDT	Special Weather Statement	OUN	Cleveland, McClain, Oklahoma	30 min
May 19, 10:47 PM CDT	Special Weather Statement	OUN	Harmon	28 min
May 19, 10:58 PM CDT	Special Weather Statement	OUN	Noble	32 min
May 19, 11:17 PM CDT	Special Weather Statement	OUN	Tillman	28 min
May 19, 11:20 PM CDT	Special Weather Statement	OUN	Greer	25 min
May 19, 11:26 PM CDT	Special Weather Statement	OUN	Noble	64 min
May 19, 11:26 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma	22 min
May 20, 12:12 AM CDT	Special Weather Statement	OUN	Greer	33 min
May 20, 12:16 AM CDT	Special Weather Statement	OUN	Comanche	29 min
May 20, 12:29 AM CDT	Special Weather Statement	OUN	Kay, Noble	61 min
May 20, 12:42 AM CDT	Special Weather Statement	OUN	Cleveland	33 min
May 20, 12:44 AM CDT	Special Weather Statement	OUN	Greer	31 min
May 20, 1:15 AM CDT	Special Weather Statement	OUN	Washita	30 min
May 20, 1:16 AM CDT	Special Weather Statement	OUN	Lincoln	29 min
May 20, 1:29 AM CDT	Special Weather Statement	OUN	Greer, Harmon	46 min
May 20, 1:59 AM CDT	Special Weather Statement	OUN	Washita	31 min
May 20, 2:05 AM CDT	Special Weather Statement	OUN	Canadian	25 min
May 20, 2:11 AM CDT	Special Weather Statement	OUN	Greer, Jackson	64 min
May 20, 2:25 AM CDT	Special Weather Statement	OUN	Ellis	35 min
May 20, 2:29 AM CDT	Special Weather Statement	OUN	Custer	31 min
May 20, 2:37 AM CDT	Areal Flood Advisory	OUN	Caddo, Comanche, Kiowa	3 hr
May 20, 2:45 AM CDT	River Flood Warning	OUN	Oklahoma	6 hr
May 20, 2:57 AM CDT	Special Weather Statement	OUN	Blaine	18 min
May 20, 3:04 AM CDT	Special Weather Statement	OUN	Logan	26 min
May 20, 3:11 AM CDT	Special Weather Statement	OUN	Caddo, Comanche, Kiowa, Tillman	49 min
May 20, 3:27 AM CDT	Areal Flood Advisory	OUN	Blaine, Caddo, Custer, Washita	3 hr
May 20, 3:54 AM CDT	Special Weather Statement	OUN	Garfield	36 min
May 20, 3:56 AM CDT	Special Weather Statement	OUN	Blaine, Caddo, Canadian, Comanche, Grady, Kingfisher and 1 more	64 min
May 20, 5:04 AM CDT	Special Weather Statement	OUN	Cleveland, Lincoln, Logan, McClain, Noble, Oklahoma and 2 more	56 min
May 20, 5:29 AM CDT	Areal Flood Advisory	OUN	Cleveland, McClain, Oklahoma	3 hr
May 20, 5:34 AM CDT	Special Weather Statement	OUN	Grant, Kay	26 min
May 20, 6:04 AM CDT	Special Weather Statement	OUN	Kay	41 min
May 20, 6:47 AM CDT	Areal Flood Advisory	OUN	Garfield	118 min
May 20, 8:45 AM CDT	Areal Flood Advisory	OUN	Canadian, Cleveland, Grady, Lincoln, McClain, Oklahoma	3 hr
May 20, 9:05 AM CDT	Special Weather Statement	OUN	Carter, Hughes, Johnston, Love, Murray, Pontotoc	40 min
May 20, 9:57 AM CDT	Special Weather Statement	OUN	Atoka, Coal, Johnston, Marshall	63 min
May 20, 10:28 AM CDT	Special Weather Statement	OUN	Carter, Garvin, Murray	32 min
May 20, 11:09 AM CDT	Special Weather Statement	OUN	Coal, Hughes, Johnston, Marshall, Pontotoc	36 min
May 20, 11:47 AM CDT	Special Weather Statement	OUN	Atoka, Bryan, Coal	43 min
May 20, 12:27 PM CDT	Special Weather Statement	OUN	Atoka, Bryan	33 min
May 20, 12:37 PM CDT	River Flood Warning	OUN	Lincoln, Oklahoma, Pottawatomie	7 hr
May 20, 2:15 PM CDT	Special Weather Statement	OUN	Love, Marshall	30 min
May 20, 2:43 PM CDT	Special Weather Statement	OUN	Bryan, Johnston, Marshall	32 min
May 20, 3:19 PM CDT	Special Weather Statement	OUN	Atoka, Coal	26 min
May 20, 3:21 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Coal	39 min
May 20, 3:58 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	32 min
May 20, 4:16 PM CDT	Special Weather Statement	OUN	Bryan	29 min
May 20, 4:52 PM CDT	Special Weather Statement	OUN	Bryan	23 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2011 Every severe thunderstorm warning 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.