Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 615, NWS Norman, OK

November 7, 2011Blaine County, Caddo County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Nov 7, 2011, 5:48 PM CST for Blaine County, Caddo County, Oklahoma. It was in force for 27 min. 1 report 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: Nov 7, 2011, 5:48 PM CST (23:48 UTC)
Expired: Nov 7, 2011, 6:15 PM CST
In force: 27 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Blaine County, OK, Caddo County, OK

The radar

The Norman radar (KTLX), 107 km from the middle of the area, began a volume at 23:49 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
Nov 7, 6:06 PM CST	HAIL 1	Hydro, 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 one storm report to this severe thunderstorm warning; the first came 18 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
Nov 7, 1:11 PM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.8 hours before the alert went out and 100 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: 1081 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 482 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 4.1

Open this sounding in Storm Lab

The text

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

361 
WUUS54 KOUN 072348
SVROUN
OKC011-015-080015-
/O.NEW.KOUN.SV.W.0615.111107T2348Z-111108T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
548 PM CST MON NOV 7 2011

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN BLAINE COUNTY IN NORTHWEST OKLAHOMA...
  NORTHWESTERN CADDO COUNTY IN SOUTHWEST OKLAHOMA...

* UNTIL 615 PM CST

* AT 548 PM CST...NATIONAL WEATHER SERVICE RADAR INDICATED SEVERE
  THUNDERSTORMS ALONG A LINE EXTENDING FROM HYDRO TO 8 MILES
  NORTHWEST OF EAKLY TO 15 MILES WEST OF EAKLY...MOVING EAST AT 30
  MPH.

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF QUARTERS...
WIND GUSTS TO 70 MPH...

* LOCATIONS IN THE WARNING INCLUDE BRIDGEPORT...EAKLY...HINTON...
  HYDRO AND LOOKEBA.

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 87 AND 103.

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 3568 9832 3535 9831 3524 9862 3564 9863
TIME...MOT...LOC 2348Z 249DEG 27KT 3555 9852 3540 9862
          3527 9879

$$
WR

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 Nov 7, 5:42 PM CST, 6 minutes earlier.

Area forecast discussion, Nov 7, 5:42 PM CST, 6 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
542 PM CST MON NOV 7 2011

.AVIATION...
A STATIONARY FRONT FROM NEAR KPNC TO KCSM WILL DRIFT NW TONIGHT AS
A SURFACE WAVE MOVES NE ALONG THE FRONT. AS THE ASSOCIATED UPPER
WAVE MOVES INTO THE PLAINS TOMORROW MORNING...A DRY SLOT WILL
BRING AN END TO MOST OF THE CONVECTION...FROM SW TO NE ACROSS OK/N
TX. OVERNIGHT...EXPECT WIDESPREAD IFR CONDITIONS...NUMEROUS
SHRA/TSRA...AND NO CLEAR ORGANIZATION OF THESE FEATURES. DUE TO
THE NATURE OF THE FORECAST CONVECTION...SOME TAF SITES WILL
PROBABLY SEE TSRA OFF-AND-ON FOR MOST OF THE NIGHT.

&&

.PREV DISCUSSION... /ISSUED 240 PM CST MON NOV 7 2011/

DISCUSSION...
CONTEMPLATED A FLASH FLOOD WATCH, BUT MOST OF THE AFTERNOON/EVENING
RAINS ARE EXPECTED TO BE IN WESTERN OKLAHOMA...OUTSIDE OF THE AREA
THAT RECEIVED HEAVY RAINFALL LAST NIGHT. NO WATCH WILL BE ISSUED
NOW. OTHERWISE, POPS WERE INCREASED TO LIKELY OR HIGHER IN AREAS
EAST OF I-35 FOR TUESDAY SINCE THE UPPER WAVE IS FORECAST TO MOVE
SLOWER THAN PREVIOUSLY FORECAST. WESTERN OKLAHOMA SHOULD CLEAR
EARLY TUESDAY WITH CENTRAL PARTS OF OKLAHOMA SUBJECT TO AN
EXPECTED SQUALL LINE LATE TONIGHT.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  60  64  37  57 /  90  40  10  10
HOBART OK         54  62  32  58 /  70  20   0   0
WICHITA FALLS TX  59  72  39  59 /  80  30  10  10
GAGE OK           44  49  29  55 /  50  20   0   0
PONCA CITY OK     58  63  35  54 /  90  60  10  10
DURANT OK         62  73  42  59 /  80  70  10  10

&&

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

23/09/23

Hazardous weather outlook, Nov 7, 11:18 AM CST, 6 hours 30 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1118 AM CST MON NOV 7 2011

OKZ004>048-050>052-TXZ083>090-081100-
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-
1118 AM CST MON NOV 7 2011

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 MUCH OF OKLAHOMA AND ALL OF WESTERN NORTH TEXAS. SEVERE
WEATHER IS MORE LIKELY TO OCCUR THIS AFTERNOON AND EVENING OVER WEST
CENTRAL AND SOUTHWEST OKLAHOMA AND ADJACENT PARTS OF NORTH TEXAS.

LOCATION...
THE AREA MOST AT RISK IS WEST OF SEILING...WEATHERFORD...LAWTON AND
WICHITA FALLS.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS IS FROM 2 PM
UNTIL 9 PM.

IMPACTS...
SOME DAMAGE TO AUTOMOBILES AND ROOFTOPS FROM LARGE HAIL. THE LARGEST
HAIL MAY BE GREATER THAN TWO INCHES DIAMETER.

DAMAGING STRAIGHT LINE WINDS AND TORNADOES.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS FROM 2 PM UNTIL
9 PM.

DISCUSSION...
A VERY HUMID AIRMASS EXISTS AND IS EXPECTED TO MAINTAIN ITSELF
ACROSS ALL BUT NORTHWEST OKLAHOMA. THINNING CLOUDS ACROSS THE
SOUTHERN TEXAS PANHANDLE WILL ALLOW WARMER SURFACE AIR TO MOVE INTO
SOUTHWEST OKLAHOMA AND ADJACENT PARTS OF NORTH TEXAS THIS AFTERNOON.
AN UPPER LEVEL TROUGH ARRIVING FROM THE WEST WILL PROVIDE INCREASED
ENERGY TO ALLOW STRONG AND SEVERE THUNDERSTORMS FROM
MID-AFTERNOON UNTIL MID-EVENING. THE WIND PROFILE WILL BECOME
INCREASINGLY FAVORABLE FOR SUPERCELL THUNDERSTORMS. THERE IS A
CONSIDERABLE RISK OF TORNADOES WITH SOME OF THE THUNDERSTORMS. THE
SUPERCELL THUNDERSTORMS WILL MOVE VERY QUICKLY TO THE NORTHEAST.
PERSONS IN WESTERN OKLAHOMA AND ADJACENT PARTS OF TEXAS SHOULD
REVIEW SEVERE WEATHER SAFETY RULES AND HAVE A PLAN OF ACTION. IN
ADDITION TO THE TORNADO POTENTIAL...SOME THUNDERSTORMS ARE EXPECTED
TO PRODUCE DAMAGING HAIL.

DURING THE EVENING A LINE OF THUNDERSTORMS IS EXPECTED TO FORM IN
WESTERN OKLAHOMA. THE MAIN HAZARDS WILL THEN BECOME HEAVY RAIN AND
DAMAGING WIND. THESE THUNDERSTORMS ARE EXPECTED TO MOVE WEST TO EAST
ACROSS MOST OF OKLAHOMA OVERNIGHT.

PROBABILITY TABLE...
VALID THROUGH 700 AM CST TUESDAY NOV 8.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...90 PERCENT.

OTHER HAZARDOUS WEATHER...
HEAVY RAINFALL THIS EVENING AND OVERNIGHT MAY PRODUCE SOME
FLOODING...ESPECIALLY IN SOUTH CENTRAL OKLAHOMA.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

THUNDERSTORM OUTLOOK...
THE CHANCE OF STRONG THUNDERSTORMS WILL LINGER INTO TUESDAY MORNING
OVER SOUTHEAST OKLAHOMA. DRY WEATHER IS THEN FORECAST FOR SEVERAL
DAYS UNTIL A CHANCE OF THUNDERSTORMS RETURNS ON SUNDAY.

OTHER HAZARDOUS WEATHER...
LIMITED FROST AND FREEZING TEMPERATURES MAY OCCUR THURSDAY AND
FRIDAY MORNINGS.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 5 AM
TUESDAY.

In the hours before

Special weather statement, Nov 7, 4:12 PM CST, 1 hour 36 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
412 PM CST MON NOV 7 2011

TXZ084-087-072245-
FOARD TX-KNOX TX-
412 PM CST MON NOV 7 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR FOARD AND KNOX COUNTIES.

AT 413 PM CST...A STRONG THUNDERSTORM WAS LOCATED 5 MILES SOUTHWEST
OF RHINELAND...MOVING NORTH AT 40 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

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

LAT...LON 3385 9980 3382 9949 3342 9962 3345 9983

Local storm report, Nov 7, 4:14 PM CST, 1 hour 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
414 PM CST MON NOV 07 2011

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

0412 PM     HAIL             10 S SAYRE              35.15N 99.63W
11/07/2011  E1.75 INCH       BECKHAM            OK   EMERGENCY MNGR

&&

CMARTIN

Local storm report, Nov 7, 4:34 PM CST, 1 hour 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
434 PM CST MON NOV 07 2011

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

0434 PM     HAIL             1 W TONKAWA             36.68N 97.33W
11/07/2011  E1.00 INCH       KAY                OK   EMERGENCY MNGR

&&

CMARTIN

Local storm report, Nov 7, 5:00 PM CST, 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
500 PM CST MON NOV 07 2011

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

0448 PM     TSTM WND GST     BURNS FLAT              35.36N 99.18W
11/07/2011  M92 MPH          WASHITA            OK   ASOS

            KCSM MEASURED WINDS OF 80 KNOTS.

&&

CMARTIN

Local storm report, Nov 7, 5:27 PM CST, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
527 PM CST MON NOV 07 2011

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

0518 PM     HAIL             4 W BESSIE              35.38N 99.06W
11/07/2011  E1.75 INCH       WASHITA            OK   FIRE DEPT/RESCUE

            ALSO REPORTED 60 MPH WINDS.

&&

CMARTIN

Local storm report, Nov 7, 5:31 PM CST, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
531 PM CST MON NOV 07 2011

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

0531 PM     HAIL             CORN                    35.38N 98.78W
11/07/2011  E1.75 INCH       WASHITA            OK   TRAINED SPOTTER

            ALSO REPORTED 60 MPH WINDS.

&&

CMARTIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 6, 9:08 PM CST	Special Weather Statement	OUN	Carter, Murray	37 min
Nov 6, 10:12 PM CST	Special Weather Statement	OUN	Murray	33 min
Nov 6, 10:19 PM CST	Special Weather Statement	OUN	Carter, Jefferson	56 min
Nov 6, 10:55 PM CST	Flash Flood Warning	OUN	Carter, Jefferson	3 hr
Nov 6, 11:47 PM CST	Flash Flood Warning	OUN	Carter, Murray	3 hr
Nov 7, 1:31 AM CST	Flash Flood Warning	OUN	Johnston, Murray, Pontotoc	4 hr
Nov 7, 7:14 AM CST	Special Weather Statement	OUN	Dewey	46 min
Nov 7, 12:25 PM CST	Special Weather Statement	OUN	Beckham	35 min
Nov 7, 1:06 PM CST	Special Weather Statement	OUN	Roger Mills	9 min
Nov 7, 1:16 PM CST	Severe Thunderstorm Warning	OUN	Beckham, Custer, Dewey, Roger Mills	59 min
Nov 7, 1:29 PM CST	Special Weather Statement	OUN	Greer, Harmon	31 min
Nov 7, 1:33 PM CST	Special Weather Statement	OUN	Jackson	42 min
Nov 7, 1:49 PM CST	Severe Thunderstorm Warning	OUN	Greer, Harmon	56 min
Nov 7, 2:02 PM CST	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson, Kiowa, Tillman	58 min
Nov 7, 2:14 PM CST	Tornado Warning	OUN	Greer, Harmon, Kiowa	46 min
Nov 7, 2:17 PM CST	Severe Thunderstorm Warning	OUN	Beckham, Blaine, Custer, Dewey, Roger Mills	58 min
Nov 7, 2:44 PM CST	Tornado Warning	OUN	Jackson, Kiowa, Tillman	46 min
Nov 7, 2:47 PM CST	Special Weather Statement	OUN	Grant, Major	43 min
Nov 7, 3:00 PM CST	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa, Washita	60 min
Nov 7, 3:08 PM CST	Tornado Warning	OUN	Kiowa, Washita	52 min
Nov 7, 3:15 PM CST	Special Weather Statement	OUN	Harmon	30 min
Nov 7, 3:23 PM CST	Special Weather Statement	OUN	Roger Mills	37 min
Nov 7, 3:27 PM CST	Tornado Warning	OUN	Comanche, Kiowa, Tillman	48 min
Nov 7, 3:34 PM CST	Special Weather Statement	OUN	Greer	26 min
Nov 7, 3:42 PM CST	Special Weather Statement	OUN	Kay	33 min
Nov 7, 3:42 PM CST	Tornado Warning	OUN	Kiowa	33 min
Nov 7, 3:47 PM CST	Special Weather Statement	OUN	Major	28 min
Nov 7, 4:05 PM CST	Severe Thunderstorm Warning	OUN	Beckham, Greer, Washita	40 min
Nov 7, 4:06 PM CST	Special Weather Statement	OUN	Caddo	24 min
Nov 7, 4:14 PM CST	Tornado Warning	OUN	Caddo, Comanche, Kiowa	46 min
Nov 7, 4:18 PM CST	Severe Thunderstorm Warning	OUN	Kay	42 min
Nov 7, 4:33 PM CST	Severe Thunderstorm Warning	OUN	Beckham, Custer, Kiowa, Washita	42 min
Nov 7, 4:39 PM CST	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	51 min
Nov 7, 4:57 PM CST	Severe Thunderstorm Warning	OUN	Kay	63 min
Nov 7, 4:57 PM CST	Tornado Warning	OUN	Caddo	38 min
Nov 7, 5:16 PM CST	Severe Thunderstorm Warning	OUN	Custer, Kiowa, Washita	59 min
Nov 7, 5:20 PM CST	Severe Thunderstorm Warning	OUN	Beckham, Greer	40 min
Nov 7, 5:37 PM CST	Severe Thunderstorm Warning	OUN	Harmon, Jackson	53 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.