Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 556, NWS Norman, OK

September 6, 2007Greer County, Jackson County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Sep 6, 2007, 9:15 PM CDT for Greer County, Jackson County, Oklahoma. It was in force for 60 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: Sep 6, 2007, 9:15 PM CDT (02:15 UTC)
Expired: Sep 6, 2007, 10:15 PM CDT
In force: 60 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

Counties Greer County, OK, Jackson County, OK

The radar

The Altus AFB radar (KFDR), 65 km from the middle of the area, began a volume at 02:18 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, 2.3 hours before the alert went out and 197 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: 1115 J/kg
Mixed-layer CIN: -153 J/kg
Mixed-layer LCL: 1491 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 149 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 4.5

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 Sep 6, 7:55 PM CDT, 1 hour 20 minutes earlier.

Area forecast discussion, Sep 6, 7:55 PM CDT, 1 hour 20 minutes before

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Hazardous weather outlook, Sep 6, 5:20 PM CDT, 3 hours 55 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
520 PM CDT THU SEP 6 2007

OKZ004>048-050>052-TXZ083>090-071200-
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-
520 PM CDT THU SEP 6 2007

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

.DAY ONE...TONIGHT...

THUNDERSTORM OUTLOOK...
ISOLATED SEVERE STORMS ARE POSSIBLE THIS EVENING ACROSS PARTS OF
SOUTHWEST OKLAHOMA AND WESTERN NORTH TEXAS.

LOCATION...
SOUTH AND WEST OF A LINE FROM CHEYENNE...TO EL RENO...DUNCAN...
WICHITA FALLS...AND MUNDAY.

TIMING...
THROUGH 9 PM.

IMPACTS...
WINDS TO NEAR 60 MPH AND QUARTER SIZE HAIL.

RECOMMENDED ACTIONS...
NONE.

DISCUSSION...
A CLUSTER OF STRONG TO MARGINALLY SEVERE STORMS WILL MOVE INTO THE
RISK AREA THIS EVENING. ALTHOUGH WIND SHEAR REMAINS WEAK...THE
PRESENCE OF HIGH INSTABILITY AND STRONG OUTFLOW GENERATED BY THE
APPROACHING STORMS MAY PROMOTE A BRIEF INCREASE IN BOTH COVERAGE AND
INTENSITY BEFORE WEAKENING LATER THIS EVENING.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT FRIDAY SEPTEMBER 7.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...25 PERCENT.

OTHER HAZARDOUS WEATHER...
LOCALLY HEAVY RAIN AND FREQUENT LIGHTNING WILL ALSO ACCOMPANY SOME
OF THE STORMS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

THUNDERSTORM OUTLOOK...
THUNDERSTORM CHANCES WILL CONTINUE THROUGH THE WEEKEND AS THE FRONT
LINGERS OVER THE AREA AND INTERACTS WITH THE TROPICAL AIRMASS.
SEVERE WEATHER CHANCES WILL REMAIN LOW.

OTHER HAZARDOUS WEATHER...
VERY HEAVY RAINFALL WILL BE LIKELY THROUGH THE WEEKEND. THIS
RAINFALL MAY LEAD TO FLOODING AND FLASH FLOODING IN SOME AREAS.
PLEASE CONTINUE TO MONITOR THE LATEST WEATHER INFORMATION FOR
FURTHER UPDATES ON THE FLOODING POTENTIAL IN YOUR AREA.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 7 AM
FRIDAY.

JAMES

In the hours before

Special weather statement, Sep 6, 7:53 PM CDT, 1 hour 22 minutes before

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Special weather statement, Sep 6, 7:56 PM CDT, 1 hour 19 minutes before

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Special weather statement, Sep 6, 8:02 PM CDT, 1 hour 13 minutes before

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Special weather statement, Sep 6, 8:19 PM CDT, 56 minutes before

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Special weather statement, Sep 6, 8:41 PM CDT, 34 minutes before

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Special weather statement, Sep 6, 9:02 PM CDT, 13 minutes 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
Sep 6, 7:13 PM CDT	Severe Thunderstorm Warning	OUN	Washita	47 min
Sep 6, 8:33 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	42 min
Sep 6, 9:59 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa	46 min
Sep 7, 3:44 AM CDT	Flash Flood Watch	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 32 more	31 hr
Sep 7, 3:30 PM CDT	Severe Thunderstorm Warning	OUN	Pontotoc	45 min
Sep 7, 5:17 PM CDT	Tornado Warning	OUN	Caddo	28 min
Sep 7, 5:45 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	45 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2007 Every severe thunderstorm warning in 2007

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.