Alert archive / Oklahoma / Flash Flood Watches in 2011

Flash Flood Watch 3, NWS Norman, OK

November 7, 201137 counties in Oklahoma; 5 counties in Texas

NWS Norman, OK issued this flash flood watch at Nov 7, 2011, 7:00 PM CST for 37 counties in Oklahoma; 5 counties in Texas. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Nov 7, 2011, 7:00 PM CST (01:00 UTC)
Expired: Nov 8, 2011, 9:36 AM CST
In force: 15 hr
Issued by: NWS Norman, OK
Flood severity: None

All 42 counties

Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Hughes County, OK, Jackson County, OK, Jefferson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, McClain County, OK, Murray County, OK, Oklahoma County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Roger Mills County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Clay County, TX, Hardeman County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 81 km from the middle of the area, began a volume at 01:02 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 nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.0 hours before the alert went out and 68 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 flash flood watch 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 flash flood watch went out at Nov 7, 5:42 PM CST, 1 hour 18 minutes earlier.

Area forecast discussion, Nov 7, 5:42 PM CST, 1 hour 18 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, 7 hours 42 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

Local storm report, Nov 7, 5:27 PM CST, 1 hour 33 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, 1 hour 29 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

Local storm report, Nov 7, 6:06 PM CST, 54 minutes before

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

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

0606 PM     HAIL             HYDRO                   35.55N 98.58W
11/07/2011  E1.00 INCH       CADDO              OK   LAW ENFORCEMENT

&&

CMARTIN

Local storm report, Nov 7, 6:41 PM CST, 19 minutes before

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

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

0639 PM     HAIL             7 W ALTUS               34.64N 99.46W
11/07/2011  E1.75 INCH       JACKSON            OK   AMATEUR RADIO

&&

CMARTIN

Local storm report, Nov 7, 6:42 PM CST, 18 minutes before

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

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

0639 PM     HAIL             MARTHA                  34.73N 99.39W
11/07/2011  E1.00 INCH       JACKSON            OK   AMATEUR RADIO

&&

CMARTIN

Local storm report, Nov 7, 6:43 PM CST, 17 minutes before

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

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

0643 PM     HAIL             MARTHA                  34.73N 99.39W
11/07/2011  E1.75 INCH       JACKSON            OK   AMATEUR RADIO

&&

CMARTIN

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, 7:25 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, 10:47 PM CST	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, Oklahoma	45 min
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

Flash Flood Watches in Oklahoma, 2011 Flash Flood Watches in Texas, 2011 Every flash flood watch 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.