Alert archive / Oklahoma / Areal Flood Warnings in 2011

Areal Flood Warning 15, NWS Tulsa, OK

April 27, 201111 counties in Oklahoma; 7 counties in Arkansas

NWS Tulsa, OK issued this areal flood warning at Apr 27, 2011, 12:00 PM CDT for 11 counties in Oklahoma; 7 counties in Arkansas. It was in force for 48 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 27, 2011, 12:00 PM CDT (17:00 UTC)
Expired: Apr 29, 2011, 12:00 PM CDT
In force: 48 hr
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Flood severity: None

Counties Benton County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Madison County, AR, Sebastian County, AR, Washington County, AR, Adair County, OK, Cherokee County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McIntosh County, OK, Muskogee County, OK, Okmulgee County, OK, Ottawa County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 57 km from the middle of the area, began a volume at 17:01 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

Springfield, MO (KSGF), launched 12:00Z, 5.0 hours before the alert went out and 152 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: 1 J/kg
Mixed-layer CIN: -327 J/kg
Mixed-layer LCL: 497 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 226 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tulsa, OK wrote its last area forecast discussion before this areal flood warning went out at Apr 27, 10:17 AM CDT, 1 hour 43 minutes earlier.

Area forecast discussion, Apr 27, 10:17 AM CDT, 1 hour 43 minutes before

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Hazardous weather outlook, Apr 27, 5:05 AM CDT, 6 hours 55 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
505 AM CDT WED APR 27 2011

ARZ001-002-010-011-019-020-029-OKZ049-053>076-281000-
ADAIR OK-BENTON AR-CARROLL AR-CHEROKEE OK-CHOCTAW OK-CRAIG OK-
CRAWFORD AR-CREEK OK-DELAWARE OK-FRANKLIN AR-HASKELL OK-LATIMER OK-
LE FLORE OK-MADISON AR-MAYES OK-MCINTOSH OK-MUSKOGEE OK-NOWATA OK-
OKFUSKEE OK-OKMULGEE OK-OSAGE OK-OTTAWA OK-PAWNEE OK-PITTSBURG OK-
PUSHMATAHA OK-ROGERS OK-SEBASTIAN AR-SEQUOYAH OK-TULSA OK-WAGONER OK-
WASHINGTON OK-WASHINGTON AR-
505 AM CDT WED APR 27 2011

THIS OUTLOOK IS FOR NORTHWEST AND WEST CENTRAL ARKANSAS AS WELL AS
MUCH OF EASTERN OKLAHOMA.

.DAY ONE...TODAY AND TONIGHT.

SEVERE THUNDERSTORM.
	RISK...LIMITED.
	AREA...PRIMARILY ALONG AND SOUTHEAST OF INTERSTATE 44.
	ONSET...MID MORNING.

FLASH FLOOD.
	RISK...LIMITED.
	AREA...NORTHWEST ARKANSAS AND EXTREME EASTERN OKLAHOMA.
	ONSET...MID MORNING.

SIGNIFICANT WINDS.
	RISK...LIMITED.
	AREA...ALL EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.
	ONSET...AFTERNOON.

DISCUSSION...
THE CORE OF AN UPPER STORM SYSTEM WILL PASS ACROSS THE AREA
DURING THE MORNING HOURS...POSSIBLY PRODUCING SCATTERED
THUNDERSTORMS.  IF THESE THUNDERSTORMS DO DEVELOP...THERE
WILL BE RISK FOR LARGE HAIL WITH THE STRONGER STORMS.
THE HIGHEST INSTABILITIES WILL RESIDE ACROSS FAR EASTERN
OKLAHOMA INTO NORTHWEST ARKANSAS...WHERE SEVERE WEATHER
CHANCES INCREASE SLIGHTLY.  THE RISK FOR SEVERE WEATHER
WILL END BY EARLY AFTERNOON AS THE STORM SYSTEM SHIFTS
EAST OF THE AREA.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
LOCAL SPOTTER ACTIVATION MAY BE NEEDED.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.
THURSDAY...NO HAZARDS.
FRIDAY...HIGH WIND POTENTIAL.
SATURDAY...THUNDERSTORM POTENTIAL...HIGH WIND POTENTIAL.
SUNDAY...SEVERE THUNDERSTORM POTENTIAL.
MONDAY AND TUESDAY...NO HAZARDS.

EXTENDED DISCUSSION...
STRONG SOUTHERLY WINDS WILL DEVELOP ON FRIDAY AHEAD OF THE
NEXT COLD FRONT...WHICH WILL MOVE INTO THE AREA SATURDAY.
THE FRONTAL BOUNDARY MAY STALL ACROSS THE AREA SATURDAY
NIGHT INTO SUNDAY...BEFORE SHIFTING FURTHER EAST BY MONDAY.
THUNDERSTORM CHANCES WILL INCREASE IN VICINITY OF THE
STALLED FRONT...WITH THE POTENTIAL FOR SEVERE WEATHER ALONG
WITH AREAS OF HEAVY RAINFALL. THE MAGNITUDE AND LOCATION OF
THE HEAVIEST RAINS REMAINS UNCERTAIN...HOWEVER ANOTHER
ROUND OF FLOODING MAY DEVELOP WITH THIS SYSTEM.

WWW.SRH.NOAA.GOV/TULSA CONTAINS ADDITIONAL INFORMATION.

In the hours before

Special weather statement, Apr 27, 8:17 AM CDT, 3 hours 43 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
817 AM CDT WED APR 27 2011

ARZ010-271345-
WASHINGTON AR-
817 AM CDT WED APR 27 2011

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY EFFECTIVE UNTIL 845 AM CDT
FOR THE FOLLOWING COUNTY...

IN NORTHWEST ARKANSAS
     NORTHWESTERN WASHINGTON

AT 817 AM CDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES SOUTH OF
SUMMERS...MOVING NORTHEAST AT 35 MPH. SOME LOCATIONS THAT WILL BE
AFFECTED BY THIS STORM INCLUDE...WALNUT GROVE...HARMON...LINCOLN...
PRAIRIE GROVE...FARMINGTON...HOGEYE...CLYDE...CANEHILL...SUMMERS...
GREENLAND...RHEA...VINEY GROVE...SAVOY AND WHEELER.

THIS STORM WILL BE CAPABLE OF PRODUCING PENNY SIZE HAIL AND WIND
GUSTS TO 40 MPH. RESIDENTS IN THESE AREAS SHOULD REMAIN ALERT IN CASE
THE SIGNIFICANT WEATHER ADVISORY IS UPGRADED TO A WARNING.

LAT...LON 3585 9450 3586 9451 3597 9453 3620 9427
      3596 9409
TIME...MOT...LOC 1317Z 233DEG 32KT 3591 9451

Local storm report, Apr 27, 8:34 AM CDT, 3 hours 26 minutes before

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Special weather statement, Apr 27, 8:48 AM CDT, 3 hours 12 minutes before

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Special weather statement, Apr 27, 8:55 AM CDT, 3 hours 5 minutes before

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Local storm report, Apr 27, 9:03 AM CDT, 2 hours 57 minutes before

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Special weather statement, Apr 27, 9:24 AM CDT, 2 hours 36 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 7:12 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw	33 min
Apr 26, 7:24 PM CDT	Special Weather Statement	TSA	Choctaw	51 min
Apr 26, 11:51 PM CDT	Areal Flood Warning	TSA	Adair, Cherokee, Craig, Delaware, Haskell, Latimer and 11 more	12 hr
Apr 27, 7:39 AM CDT	Severe Thunderstorm Warning	TSA	Haskell, Muskogee	22 min
Apr 27, 12:43 PM CDT	Flash Flood Warning	TSA	Adair, Delaware	4 hr
Apr 26, 7:16 PM CDT	Special Weather Statement	TSA	Carroll	14 min
Apr 27, 7:52 AM CDT	Special Weather Statement	TSA	Crawford	23 min
Apr 27, 8:11 AM CDT	Special Weather Statement	TSA	Crawford	34 min
Apr 27, 8:17 AM CDT	Special Weather Statement	TSA	Washington	28 min
Apr 27, 8:24 AM CDT	Severe Thunderstorm Warning	TSA	Crawford, Washington	28 min
Apr 27, 8:48 AM CDT	Special Weather Statement	TSA	Madison	42 min
Apr 27, 8:55 AM CDT	Special Weather Statement	TSA	Franklin	35 min
Apr 27, 9:24 AM CDT	Special Weather Statement	TSA	Carroll	51 min

Nearby

Areal Flood Warnings in Oklahoma, 2011 Areal Flood Warnings in Arkansas, 2011 Every areal flood 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.