Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 89, NWS Norman, OK

April 6, 2006Noble County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 6, 2006, 3:08 PM CDT for Noble County, Oklahoma. It was in force for 52 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: Apr 6, 2006, 3:08 PM CDT (20:08 UTC)
Expired: Apr 6, 2006, 4:00 PM CDT
In force: 52 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

County Noble County, OK

The radar

The Vance AFB radar (KVNX), 89 km from the middle of the area, began a volume at 20:10 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
Apr 6, 1:26 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 12:00Z, 8.1 hours before the alert went out and 34 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: 693 J/kg
Mixed-layer CIN: -332 J/kg
Mixed-layer LCL: 1682 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Apr 6, 2:59 PM CDT, 9 minutes earlier.

Area forecast discussion, Apr 6, 2:59 PM CDT, 9 minutes before

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Hazardous weather outlook, Apr 6, 12:00 PM CDT, 3 hours 8 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1200 PM CDT THU APR 6 2006

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-
1200 PM CDT THU APR 6 2006

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 THIS AFTERNOON AND
EVENING ACROSS PORTIONS OF WESTERN NORTH TEXAS...AND CENTRAL AND
SOUTHEAST OKLAHOMA.

LOCATION...
MAINLY EAST OF A LINE FROM MEDFORD...TO EL RENO...TO DUNCAN...AND
HENRIETTA TEXAS.

TIMING...
PRIMARILY FROM 1 PM TO 9 PM.

IMPACTS...
THE PRIMARY IMPACTS WILL BE GOLFBALL SIZE HAIL AND WINDS TO 70 MPH.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD BE PREPARED FOR THE POSSIBILITY OF SEVERE STORMS
FROM 1 PM TO 9 PM.

DISCUSSION...
A DRYLINE WILL REACH WESTERN EDGES OF THE SLIGHT RISK AREA BY EARLY
AFTERNOON...WITH HEATING AND CONVERGENCE RESULTING IN SCATTERED
THUNDERSTORMS ALONG IT. THE COMBINATION OF MODERATE INSTABILITY AND
STRONG SHEAR WILL ALLOW STORMS TO QUICKLY BECOME SEVERE...WITH
SUPERCELLS POSSIBLE...WHICH MAY BE ACCOMPANIED BY GOLFBALL SIZE HAIL
AND WINDS TO 70 MPH.

THE DRYLINE HAS MOVED SLOWER THAN EXPECTED...RESULTING IN THE SLIGHT
RISK AREA BEING ADJUSTED SLIGHTLY WESTWARD TO INCLUDE DUNCAN...
WAURIKA...AND HENRIETTA. THE DRYLINE IS FORECAST TO MOVE THROUGH
SOUTHEAST OKLAHOMA AROUND 9 PM...WITH THE RISK OF SEVERE STORMS
MOVING EAST WITH IT.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT FRIDAY APR 7.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...70 PERCENT.

OTHER HAZARDOUS WEATHER...
STRONG WESTERLY WINDS WILL DEVELOP ACROSS WESTERN OKLAHOMA AND
WESTERN NORTH TEXAS EARLY THIS AFTERNOON...AS THE DRYLINE PASSES.
WINDS OF 25 TO 35 MPH WITH GUSTS NEAR 45 MPH ARE EXPECTED. THESE
WINDS MAY EXPAND FARTHER EASTWARD LATER TODAY. IN ADDITION...LOW
HUMIDITIES AND WARM TEMPERATURES WILL RESULT IN EXTREME FIRE DANGER
BEHIND THE DRYLINE.

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

THUNDERSTORM OUTLOOK...
THE NEXT CHANCE FOR THUNDERSTORMS IS TUESDAY.

OTHER HAZARDOUS WEATHER...
NORTHWEST WINDS OF 25 TO 35 MPH...WITH GUSTS NEAR 45 WILL OVERSPREAD
THE NORTHERN HALF OF OKLAHOMA FRIDAY MORNING...BEFORE EXPANDING
SOUTHWARD DURING THE DAY.

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

JAMES

In the hours before

Special weather statement, Apr 6, 9:15 AM CDT, 5 hours 53 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
915 AM CDT THU APR 6 2006

OKZ028>030-040-061430-
POTTAWATOMIE OK-CLEVELAND OK-MCCLAIN OK-GARVIN OK-
915 AM CDT THU APR 6 2006

...SIGNIFICANT WEATHER ADVISORY...

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

A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 3 MILES SOUTH OF
ETOWAH TO 4 MILES SOUTH OF ELMORE CITY AT 915 AM CDT...MOVING
NORTHEAST AT 45 MPH.

WINDS AROUND 50 MPH ARE POSSIBLE.

PEOPLE IN CLEVELAND...GARVIN...MCCLAIN AND POTTAWATOMIE COUNTIES
SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR WARNINGS AND
REMAIN ALERT FOR THREATENING WEATHER CONDITIONS.

TY

Special weather statement, Apr 6, 2:40 PM CDT, 28 minutes before

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Special weather statement, Apr 6, 2:42 PM CDT, 26 minutes before

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Local storm report, Apr 6, 2:45 PM CDT, 23 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
Apr 6, 2:47 PM CDT	Severe Thunderstorm Warning	OUN	Payne	43 min
Apr 6, 3:34 PM CDT	Fire Weather Watch	OUN	Cotton, Harmon, Jackson, Tillman	13 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2006 Every severe thunderstorm warning in 2006

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.