Alert archive / Oklahoma / Flood Watches in 2008

Flood Watch 2, NWS Norman, OK

May 27, 200828 counties in Oklahoma; 8 counties in Texas

NWS Norman, OK issued this flood watch at May 27, 2008, 12:04 PM CDT for 28 counties in Oklahoma; 8 counties in Texas. It took effect at May 27, 2008, 5:34 PM CDT. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: May 27, 2008, 12:04 PM CDT (17:04 UTC)
In effect from: May 27, 2008, 5:34 PM CDT
Expired: May 27, 2008, 9:53 PM CDT
In force: 4 hr
Issued by: NWS Norman, OK
Flood severity: None

All 36 counties

Atoka County, OK, Beckham County, OK, Bryan County, OK, Caddo County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Hughes County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kiowa County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Foard County, TX, Hardeman County, TX, Knox County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 86 km from the middle of the area, began a volume at 17:04 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

Fort Worth, TX (KFWD), launched 12:00Z, 5.1 hours before the alert went out and 198 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: 1167 J/kg
Mixed-layer CIN: -136 J/kg
Mixed-layer LCL: 626 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 213 m²/s²
0-3 km storm-relative helicity: 194 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this 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 flood watch went out at May 27, 11:55 AM CDT, 9 minutes earlier.

Area forecast discussion, May 27, 11:55 AM CDT, 9 minutes before

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Hazardous weather outlook, May 27, 11:58 AM CDT, 6 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1158 AM CDT TUE MAY 27 2008

OKZ004>048-050>052-TXZ083>090-281200-
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-
1158 AM CDT TUE MAY 27 2008

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS PARTS OF WESTERN
OKLAHOMA AND ALL OF WESTERN NORTH TEXAS.

LOCATION...
THE SLIGHT RISK AREA IS SOUTHWEST OF A LINE FROM ARNETT... TO
WATONGA... TO DUNCAN AND WAURIKA OKLAHOMA. THIS ALSO INCLUDES ALL OF
WESTERN NORTH TEXAS.

TIMING...
THE MOST LIKELY TIME FOR SEVERE WEATHER WILL BE AFTER 2 PM INTO
TONIGHT.

IMPACTS...
LARGE HAIL TO THE SIZE OF GOLFBALLS... STRONG WINDS TO 65 MPH... AND
LOCALLY HEAVY RAINS WILL BE THE MAIN SEVERE WEATHER CONCERNS.
HOWEVER... AN ISOLATED TORNADO CANNOT BE RULED OUT THIS AFTERNOON
AND EVENING. LOCALLY HEAVY RAINFALL WHICH MAY CAUSE FLOODING WILL
ALSO BE POSSIBLE.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN ON SEVERE WEATHER OPERATIONS THIS AFTERNOON
AND TONIGHT.

DISCUSSION...
ONGOING THUNDERSTORMS ACROSS PARTS OF CENTRAL AND SOUTHEAST OKLAHOMA
WILL CONTINUE EARLY THIS AFTERNOON. MEANWHILE... A COLD FRONT
LOCATED OVER THE OKLAHOMA AND TEXAS PANHANDLES WILL MOVE INTO PARTS
OF WESTERN OKLAHOMA THIS AFTERNOON AND CONTINUE TO MOVE ACROSS THE
AREA TONIGHT. THE MORNING STORMS HAVE ALSO GENERATED AN OUTFLOW
BOUNDARY THAT WILL EXTEND FROM THE COLD FRONT SOUTHEASTWARD ACROSS
SOUTHWEST OKLAHOMA AND WESTERN NORTH TEXAS. SCATTERED THUNDERSTORMS
ARE EXPECTED TO DEVELOP ALONG THE FRONT DURING THE AFTERNOON HOURS.
IF THE OUTFLOW BOUNDARY CAN MAINTAIN ITSELF THIS AFTERNOON... IT
COULD ALSO BE A FOCUS FOR ADDITIONAL THUNDERSTORM DEVELOPMENT. THE
AIRMASS TO THE SOUTH OF THE OUTFLOW BOUNDARY IS EXPECTED TO BECOME
VERY UNSTABLE THIS AFTERNOON ACROSS PARTS OF SOUTHWEST OKLAHOMA AND
NORTH TEXAS. SOME OF THE STORMS MAY BECOME SEVERE DESPITE RATHER
MODEST WIND SHEAR. THE PRIMARY SEVERE WEATHER THREATS ARE EXPECTED
TO BE LARGE HAIL AND DAMAGING WINDS. HOWEVER... ISOLATED TORNADOES
COULD STILL BE A THREAT THIS AFTERNOON AND EVENING... IF THE
REMNANTS OF THE OUTFLOW BOUNDARY AND THE COLD FRONT CAN FAVORABLY
MODIFY THE LOW LEVEL WINDS IN THE AREA AND THE INSTABILITIES REACH
VERY HIGH VALUES.

THE THUNDERSTORM ACTIVITY IS EXPECTED TO ADVANCE TO THE SOUTHEAST AS
THE COLD FRONT MOVES ACROSS THE AREA.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT WEDNESDAY MAY 28.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...60 PERCENT.

OTHER HAZARDOUS WEATHER...
LOCALLY HEAVY RAINFALL WILL ALSO BE POSSIBLE TONIGHT. THE HEAVY RAIN
MAY LEAD TO FLOODING IN SOME LOCATIONS. PLEASE REFER TO THE FLOOD
WATCH FOR FURTHER DETAILS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

THUNDERSTORM OUTLOOK...
A FEW THUNDERSTORMS MAY BE CONTINUING IN SOUTHEAST OKLAHOMA ON
WEDNESDAY. THERE WILL ALSO BE A SLIGHT CHANCE OF STORMS IN NORTHERN
OKLAHOMA SUNDAY NIGHT.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT NOON
TODAY.

MAXWELL

In the hours before

Special weather statement, May 27, 6:14 AM CDT, 5 hours 50 minutes before

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Special weather statement, May 27, 7:05 AM CDT, 4 hours 59 minutes before

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Special weather statement, May 27, 7:26 AM CDT, 4 hours 38 minutes before

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Local storm report, May 27, 7:42 AM CDT, 4 hours 22 minutes before

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Special weather statement, May 27, 9:13 AM CDT, 2 hours 51 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
913 AM CDT TUE MAY 27 2008

OKZ028>030-040>042-271445-
POTTAWATOMIE OK-CLEVELAND OK-MCCLAIN OK-MURRAY OK-GARVIN OK-
PONTOTOC OK-
913 AM CDT TUE MAY 27 2008

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR CLEVELAND...GARVIN...
MCCLAIN...MURRAY...PONTOTOC AND POTTAWATOMIE COUNTIES.

A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM NEAR NORMAN TO 8
MILES EAST OF DAVIS AT 913 AM CDT...MOVING EAST SOUTHEAST AT 19 MPH.
SMALL HAIL... FREQUENT LIGHTNING AND VERY HEAVY RAIN RESTRICTING
VISIBILITIES WILL BE LIKELY WITH THIS LINE OF STORMS.

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

30

Local storm report, May 27, 12:03 PM CDT, 1 minute before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 7:00 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Dewey, Roger Mills, Washita	60 min
May 26, 7:07 PM CDT	Flash Flood Warning	OUN	Kay	3 hr
May 26, 7:12 PM CDT	Tornado Warning	OUN	Kay	33 min
May 26, 7:17 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon	43 min
May 26, 7:39 PM CDT	Tornado Warning	OUN	Greer, Harmon	51 min
May 26, 7:43 PM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble	47 min
May 26, 8:02 PM CDT	Severe Thunderstorm Warning	OUN	Custer	43 min
May 26, 8:07 PM CDT	High Wind Warning	OUN	Harper, Woods, Woodward	53 min
May 26, 8:22 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	38 min
May 26, 8:27 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon	48 min
May 26, 8:27 PM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble	35 min
May 26, 8:39 PM CDT	Areal Flood Advisory	OUN	Beckham, Greer, Harmon	3 hr
May 26, 8:56 PM CDT	Severe Thunderstorm Warning	OUN	Garfield	49 min
May 26, 9:00 PM CDT	Severe Thunderstorm Warning	OUN	Roger Mills	45 min
May 26, 9:14 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon	61 min
May 26, 9:23 PM CDT	Tornado Warning	OUN	Grant, Kay	37 min
May 26, 9:42 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	48 min
May 26, 9:42 PM CDT	Severe Thunderstorm Warning	OUN	Roger Mills	48 min
May 26, 9:59 PM CDT	Severe Thunderstorm Warning	OUN	Kay	46 min
May 26, 10:03 PM CDT	Areal Flood Advisory	OUN	Roger Mills	3 hr
May 26, 10:13 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Kiowa, Washita	47 min
May 26, 10:17 PM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble, Payne	43 min
May 26, 10:27 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Dewey, Roger Mills, Washita	63 min
May 26, 10:36 PM CDT	Areal Flood Warning	OUN	Kay	6 hr
May 26, 10:47 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Payne	43 min
May 26, 11:04 PM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	41 min
May 26, 11:28 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	47 min
May 26, 11:29 PM CDT	Severe Thunderstorm Warning	OUN	Payne	46 min
May 26, 11:50 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Custer, Washita	40 min
May 27, 12:01 AM CDT	Tornado Warning	OUN	Beckham, Custer, Roger Mills, Washita	29 min
May 27, 12:26 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian	49 min
May 27, 12:28 AM CDT	Tornado Warning	OUN	Custer, Washita	32 min
May 27, 12:47 AM CDT	Tornado Warning	OUN	Custer, Washita	28 min
May 27, 12:56 AM CDT	Tornado Warning	OUN	Caddo	34 min
May 27, 1:07 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher	38 min
May 27, 1:20 AM CDT	Severe Thunderstorm Warning	OUN	Caddo	40 min
May 27, 1:43 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Cleveland, Grady, Kingfisher, Logan and 2 more	62 min
May 27, 2:32 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pottawatomie, Seminole	58 min
May 27, 2:47 AM CDT	River Flood Warning	OUN	Grant, Kay	29 hr
May 27, 3:24 AM CDT	Severe Thunderstorm Warning	OUN	Grady	51 min
May 27, 3:30 AM CDT	Severe Thunderstorm Warning	OUN	Hughes, Pontotoc, Seminole	45 min
May 27, 3:53 AM CDT	Severe Thunderstorm Warning	OUN	Hughes	52 min
May 27, 4:03 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, McClain, Stephens	42 min
May 27, 5:57 AM CDT	Areal Flood Advisory	OUN	Grady, Stephens	3 hr
May 27, 6:26 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson	49 min
May 27, 7:49 AM CDT	Areal Flood Advisory	OUN	Carter, Jefferson, Love	116 min
May 27, 7:58 AM CDT	Severe Thunderstorm Warning	OUN	Love	32 min
May 27, 3:35 PM CDT	Severe Thunderstorm Warning	OUN	Custer	40 min
May 27, 3:38 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson	52 min
May 27, 3:48 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Washita	27 min
May 27, 3:56 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major	49 min
May 27, 4:13 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Washita	47 min
May 27, 4:24 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	51 min
May 27, 4:41 PM CDT	Flash Flood Warning	OUN	Jackson	2 hr
May 27, 5:09 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	51 min
May 27, 5:12 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Greer, Kiowa, Washita	48 min
May 27, 6:09 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	31 min
May 27, 6:24 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	66 min
May 27, 3:07 PM CDT	Severe Thunderstorm Warning	OUN	Hardeman	38 min
May 27, 4:28 PM CDT	Severe Thunderstorm Warning	OUN	Foard	47 min
May 27, 4:53 PM CDT	Flash Flood Warning	OUN	Foard, Knox	2 hr
May 27, 5:14 PM CDT	Severe Thunderstorm Warning	OUN	Foard	61 min
May 27, 6:16 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Knox	59 min

Nearby

Flood Watches in Oklahoma, 2008 Flood Watches in Texas, 2008 Every flood watch in 2008

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.