Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 627, NWS Norman, OK

November 7, 20114 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Nov 7, 2011, 10:47 PM CST for 4 counties in Oklahoma. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Nov 7, 2011, 10:47 PM CST (04:47 UTC)
Expired: Nov 7, 2011, 11:32 PM CST
In force: 45 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Canadian County, OK, Cleveland County, OK, Grady County, OK, Oklahoma County, OK

The radar

The Norman radar (KTLX), 34 km from the middle of the area, began a volume at 04:49 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.

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, 8:28 PM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 4.8 hours before the alert went out and 26 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: 1647 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 574 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 316 m²/s²
0-3 km storm-relative helicity: 325 m²/s²
Significant tornado parameter: 3.0
Supercell composite: 12.9

Open this sounding in Storm Lab

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, 9:52 PM CST, 55 minutes earlier.

Area forecast discussion, Nov 7, 9:52 PM CST, 55 minutes before

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

.DISCUSSION...
WE ARE UPDATING THE FLASH FLOOD WATCH TO BE FARTHER SOUTH. NEW
NUMERICAL GUIDANCE AND RADAR TRENDS SHOW THE HEAVY RAIN SHIFTING
SLOWLY TOWARD THE SOUTHEAST TONIGHT.

&&

.PREV DISCUSSION... /ISSUED 750 PM CST MON NOV 7 2011/

DISCUSSION...
WE ISSUED A FLASH FLOOD WATCH A SHORT TIME AGO...AND ARE NOW ALSO
MAKING SOME ADJUSTMENTS TO RAINFALL AND POP FORECASTS. THE BASIC
IDEA IS THAT WE EXPECT TRAINING ECHOES ALONG A STATIONARY FRONT THIS
EVENING...LEADING TO HEAVY RAINFALL AND THE POSSIBILITY OF FLASH
FLOODING. THE FRONT IS EXPECTED TO SHIFT SLIGHTLY TO THE NORTHWEST
OVERNIGHT AS A SURFACE WAVE MOVES FROM NEAR THE SOUTHWEST CORNER
OF OKLAHOMA NORTHEAST INTO CENTRAL OKLAHOMA. THIS SHOULD SIMILARLY
SHIFT THE HEAVIER RAINFALL NORTHWEST OVERNIGHT.

PREV DISCUSSION... /ISSUED 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 / 100  20   0   0
WICHITA FALLS TX  59  72  39  59 /  70  30  10  10
GAGE OK           44  49  29  55 /  60  20   0   0
PONCA CITY OK     58  63  35  54 / 100  60  10  10
DURANT OK         62  73  42  59 /  50  70  10  10

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...FLASH FLOOD WATCH UNTIL 6 AM CST TUESDAY FOR OKZ018>020-022>029-
     033>036.

TX...NONE.
&&

23/02

Hazardous weather outlook, Nov 7, 9:50 PM CST, 57 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
950 PM 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-
950 PM 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 OVERNIGHT ACROSS MUCH
OF OKLAHOMA AND ALL OF WESTERN NORTH TEXAS.

LOCATION...
THE SLIGHT RISK AREA IS EAST OF A LINE FROM HOLLIS...TO WATONGA...TO
BLACKWELL...AND WEST OF A LINE FROM MARIETTA TO HOLDENVILLE.

TIMING...
SEVERE STORMS WILL BE MOST LIKELY FROM NOW THROUGH 4 AM.

IMPACTS...
DAMAGE TO VEHICLES AND BUILDINGS FROM HAIL...STRONG WINDS...AND
POSSIBLY TORNADOES.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS THROUGH ABOUT 4
AM.

DISCUSSION...
A VERY HUMID AIRMASS IS EXPECTED TO MAINTAIN ITSELF ACROSS ALL BUT
NORTHWEST OKLAHOMA. AN UPPER LEVEL TROUGH ARRIVING FROM THE WEST
WILL PROVIDE INCREASED ENERGY TO ALLOW STRONG AND SEVERE
THUNDERSTORMS TONIGHT. THE WIND PROFILE WILL BE FAVORABLE FOR
SUPERCELL THUNDERSTORMS. THERE IS A RISK OF TORNADOES WITH SOME OF
THE THUNDERSTORMS. MOST OF THE STORMS WILL MOVE TOWARD THE
NORTHEAST. BOW ECHOES WILL FORM OCCASIONALLY OVERNIGHT...WITH THE
ASSOCIATED RISK OF DAMAGING WINDS.

HEAVY RAIN WILL ALSO BE LIKELY...AND FLASH FLOODING IS
POSSIBLE...MAINLY ALONG A LINE FROM FAR SOUTHWEST OKLAHOMA TO
NORTH-CENTRAL OKLAHOMA.

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...100 PERCENT.

OTHER HAZARDOUS WEATHER...
HEAVY RAINFALL THIS EVENING AND OVERNIGHT MAY PRODUCE SOME FLOODING.

.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.

CMS

In the hours before

Local storm report, Nov 7, 8:35 PM CST, 2 hours 12 minutes before

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

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

0825 PM     TSTM WND GST     2 NNW PERKINS           36.00N 97.05W
11/07/2011  M66 MPH          PAYNE              OK   MESONET

&&

DEW

Local storm report, Nov 7, 8:41 PM CST, 2 hours 6 minutes before

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

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

0830 PM     TSTM WND GST     2 NNW PERKINS           36.00N 97.05W
11/07/2011  M81 MPH          PAYNE              OK   MESONET

&&

DEW

Special weather statement, Nov 7, 9:21 PM CST, 1 hour 26 minutes before

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

OKZ019-020-024>026-028-029-080330-
CANADIAN OK-CLEVELAND OK-LINCOLN OK-LOGAN OK-MCCLAIN OK-OKLAHOMA OK-
PAYNE OK-
921 PM CST MON NOV 7 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR CANADIAN...CLEVELAND...
LINCOLN...LOGAN...MCCLAIN...OKLAHOMA AND PAYNE COUNTIES.

AT 919 PM CST...THE LEADING EDGE OF AN AREA OF STRONG THUNDERSTORMS
EXTENDED FROM CUSHING TO NORTH SIDES OF OKLAHOMA CITY TO UNION CITY.
THE STORMS WERE MOVING NORTHEAST AT 40 MPH.

HAZARDS INCLUDE...
WIND GUSTS TO 50 MPH...
HAIL UP TO THE SIZE OF NICKELS...
FREQUENT CLOUD TO GROUND LIGHTNING...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

SEVERE WEATHER IS NOT EXPECTED AND NO WARNINGS ARE ANTICIPATED AT
THIS TIME.

LAT...LON 3622 9681 3616 9680 3617 9668 3571 9661
      3524 9766 3534 9767 3533 9771 3563 9784
      3626 9685

Local storm report, Nov 7, 9:31 PM CST, 1 hour 16 minutes before

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

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

0930 PM     HAIL             7 SSW FORT COBB         35.01N 98.49W
11/07/2011  E1.00 INCH       CADDO              OK   AMATEUR RADIO

&&

DW

Special weather statement, Nov 7, 9:31 PM CST, 1 hour 16 minutes before

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

OKZ023-035-037-038-TXZ085-080400-
CADDO OK-COMANCHE OK-KIOWA OK-TILLMAN OK-WILBARGER TX-
931 PM CST MON NOV 7 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR CADDO...COMANCHE...KIOWA...
TILLMAN AND WILBARGER COUNTIES.

AT 931 PM CST...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 10
MILES NORTH OF WICHITA MOUNTAINS WILDLIFE REFUGE TO DAVIDSON...MOVING
NORTHEAST AT 40 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH...
WIND GUSTS TO 50 MPH...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

LAT...LON 3501 9851 3469 9859 3462 9863 3432 9873
      3412 9914 3448 9903 3452 9890 3493 9874

Special weather statement, Nov 7, 10:08 PM CST, 39 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1008 PM CST MON NOV 7 2011

OKZ023-024-027-038-080445-
CADDO OK-CANADIAN OK-COMANCHE OK-GRADY OK-
1008 PM CST MON NOV 7 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR CADDO...CANADIAN...COMANCHE
AND GRADY COUNTIES.

AT 1007 PM CST...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 5
MILES WEST OF MINCO TO SOUTHERN LAKE ELLSWORTH...MOVING EAST AT 30
MPH. TORRENTIAL RAINFALL AND STRONG WINDS CAN BE EXPECTED FROM THESE
STORMS.

HAZARDS INCLUDE...
WIND GUSTS TO 50 MPH...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

LAT...LON 3539 9767 3483 9780 3473 9802 3474 9854
      3488 9832 3543 9809

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 7, 6:12 PM CST	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Custer, Kingfisher, Kiowa and 1 more	63 min
Nov 7, 6:15 PM CST	Severe Thunderstorm Warning	OUN	Greer, Jackson	45 min
Nov 7, 6:30 PM CST	Areal Flood Advisory	OUN	Beckham, Blaine, Caddo, Canadian, Custer, Greer and 3 more	3 hr
Nov 7, 6:32 PM CST	Areal Flood Advisory	OUN	Beckham, Blaine, Caddo, Canadian, Custer, Greer and 3 more	3 hr
Nov 7, 6:41 PM CST	Severe Thunderstorm Warning	OUN	Harmon, Jackson	49 min
Nov 7, 6:58 PM CST	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	47 min
Nov 7, 7:00 PM CST	Flash Flood Watch	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Carter and 31 more	15 hr
Nov 7, 7:25 PM CST	Severe Thunderstorm Warning	OUN	Comanche, Greer, Jackson, Kiowa, Tillman, Washita	50 min
Nov 7, 8:16 PM CST	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	44 min
Nov 7, 8:22 PM CST	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Kiowa	53 min
Nov 7, 8:26 PM CST	Severe Thunderstorm Warning	OUN	Tillman	64 min
Nov 7, 8:44 PM CST	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	46 min
Nov 7, 9:13 PM CST	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady	47 min
Nov 7, 9:21 PM CST	Special Weather Statement	OUN	Lincoln, Oklahoma, Payne	9 min
Nov 7, 9:31 PM CST	Special Weather Statement	OUN	Tillman	29 min
Nov 7, 10:08 PM CST	Special Weather Statement	OUN	Grady	37 min
Nov 7, 10:10 PM CST	Flash Flood Warning	OUN	Caddo, Canadian, Cleveland, Grady, Lincoln, Logan and 4 more	3 hr
Nov 7, 10:59 PM CST	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Oklahoma, Pottawatomie	61 min
Nov 7, 11:03 PM CST	Special Weather Statement	OUN	Stephens	42 min
Nov 7, 11:14 PM CST	Special Weather Statement	OUN	Jackson	31 min
Nov 7, 11:20 PM CST	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie, Seminole	55 min
Nov 7, 11:29 PM CST	Special Weather Statement	OUN	Stephens	46 min
Nov 7, 11:54 PM CST	Special Weather Statement	OUN	Garvin, McClain	36 min
Nov 8, 12:19 AM CST	Special Weather Statement	OUN	Okfuskee	26 min
Nov 8, 12:30 AM CST	Special Weather Statement	OUN	Jackson	30 min
Nov 8, 1:16 AM CST	Special Weather Statement	OUN	Stephens	14 min
Nov 8, 1:25 AM CST	Special Weather Statement	OUN	Jackson	35 min
Nov 8, 1:55 AM CST	Special Weather Statement	OUN	Garvin	35 min
Nov 8, 5:33 AM CST	Special Weather Statement	OUN	Jefferson	27 min
Nov 8, 6:29 AM CST	Special Weather Statement	OUN	Love	46 min
Nov 8, 7:00 AM CST	Special Weather Statement	OUN	Carter, Johnston, Marshall	45 min
Nov 8, 7:38 AM CST	Special Weather Statement	OUN	Atoka, Bryan, Coal, Johnston, Marshall, Pontotoc	37 min
Nov 8, 7:48 AM CST	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Coal, Hughes, Johnston, Marshall and 1 more	87 min
Nov 8, 9:19 AM CST	Special Weather Statement	OUN	Atoka, Bryan	26 min
Nov 8, 9:35 AM CST	Special Weather Statement	OUN	Atoka	10 min
Nov 8, 3:12 PM CST	River Flood Warning	OUN	Logan	16 hr
Nov 8, 3:12 PM CST	River Flood Warning	OUN	Logan	18 hr
Nov 7, 6:35 PM CST	Severe Thunderstorm Warning	OUN	Foard, Hardeman	55 min
Nov 8, 2:53 AM CST	Special Weather Statement	OUN	Knox	22 min
Nov 8, 3:29 AM CST	Special Weather Statement	OUN	Baylor	46 min
Nov 8, 3:51 AM CST	Severe Thunderstorm Warning	OUN	Archer, Baylor	69 min
Nov 8, 4:33 AM CST	Special Weather Statement	OUN	Clay, Wichita	42 min
Nov 8, 4:46 AM CST	Severe Thunderstorm Warning	OUN	Clay	44 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.