Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 86, NWS Norman, OK

March 30, 2009Atoka County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 30, 2009, 10:58 PM CDT for Atoka County, Oklahoma. It was in force for 47 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: Mar 30, 2009, 10:58 PM CDT (03:58 UTC)
Expired: Mar 30, 2009, 11:45 PM CDT
In force: 47 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

County Atoka County, OK

The radar

The Norman radar (KTLX), 155 km from the middle of the area, began a volume at 04:00 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
Mar 30, 5:18 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 4.0 hours before the alert went out and 156 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: 118 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 1627 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

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 Mar 30, 10:04 PM CDT, 54 minutes earlier.

Area forecast discussion, Mar 30, 10:04 PM CDT, 54 minutes before

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Hazardous weather outlook, Mar 30, 11:55 AM CDT, 11 hours 3 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1155 AM CDT MON MAR 30 2009

OKZ004>048-050>052-TXZ083>090-311200-
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-
1155 AM CDT MON MAR 30 2009

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 THUNDERSTORMS MAINLY THIS EVENING ACROSS
PARTS OF CENTRAL AND EASTERN OKLAHOMA.

LOCATION...
THE SLIGHT RISK AREA IS MAINLY NEAR AND EAST OF THE INTERSTATE 35
CORRIDOR.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE DURING THE
EVENING HOURS.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA MAY NEED TO IMPLEMENT SEVERE WEATHER OPERATIONS FOR A TIME
THIS EVENING.

DISCUSSION...
A STRONG STORM SYSTEM WILL MOVE FROM THE CENTRAL AND SOUTHERN
ROCKIES INTO THE CENTRAL PLAINS THIS AFTERNOON AND TONIGHT. AT THE
SURFACE... A COLD FRONT MOVING INTO FAR NORTHWEST OKLAHOMA AT MIDDAY
WILL EXTEND FROM NORTH CENTRAL OKLAHOMA INTO SOUTHWEST OKLAHOMA AND
WESTERN NORTH TEXAS BY EARLY EVENING. AS THE FRONT CONTINUES TO MOVE
EAST LATE THIS AFTERNOON AND EVENING... SCATTERED SHOWERS AND
THUNDERSTORMS WILL LIKELY DEVELOP ACROSS CENTRAL AND EASTERN
OKLAHOMA. A FEW STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE...
WITH THE A SOMEWHAT BETTER CHANCE BEING ACROSS NORTHERN OKLAHOMA...
NEARER TO THE UPPER LEVEL STORM SYSTEM. THE SEVERE WEATHER POTENTIAL
WILL BE CONSTRAINED BY RATHER LIMITED AMOUNTS OF INSTABILITY AND
LOW LEVEL MOISTURE. THE PRIMARY SEVERE WEATHER THREATS WILL BE HAIL
UP TO THE SIZE OF QUARTERS AND ISOLATED WIND GUSTS OF 50 TO 60 MPH.
THE COLD FRONT AND THUNDERSTORMS SHOULD MOVE EAST OUT OF THE RISK
AREA BY AROUND MIDNIGHT.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT TUESDAY MAR 31.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...70 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...30 PERCENT.

OTHER HAZARDOUS WEATHER...
VERY WARM AND DRY CONDITIONS ACROSS WESTERN NORTH TEXAS AND
SOUTHWEST OKLAHOMA THIS AFTERNOON WILL RESULT IN AN INCREASED FIRE
DANGER.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

THUNDERSTORM OUTLOOK...
ADDITIONAL STORM SYSTEMS WILL AFFECT THE AREA WITH A CHANCE OF
THUNDERSTORMS WEDNESDAY NIGHT AND THURSDAY AND AGAIN SATURDAY AND
SATURDAY NIGHT.

OTHER HAZARDOUS WEATHER...
WARM AND DRY WEATHER WILL CREATE VERY HIGH FIRE DANGER ACROSS
WESTERN NORTH TEXAS AND PORTIONS OF SOUTHWEST OKLAHOMA ON WEDNESDAY
AFTERNOON... AND AGAIN ON FRIDAY AND SATURDAY.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED BY 7 AM
TUESDAY MORNING.

CJS

In the hours before

Local storm report, Mar 30, 9:22 PM CDT, 1 hour 36 minutes before

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Local storm report, Mar 30, 9:26 PM CDT, 1 hour 32 minutes before

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Local storm report, Mar 30, 9:58 PM CDT, 1 hour before

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Local storm report, Mar 30, 10:10 PM CDT, 48 minutes before

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Special weather statement, Mar 30, 10:39 PM CDT, 19 minutes before

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Local storm report, Mar 30, 10:49 PM CDT, 9 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
Mar 30, 7:28 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Comanche, Grady, Logan, Noble and 2 more	47 min
Mar 30, 8:09 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Grady, McClain, Stephens	51 min
Mar 30, 8:20 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Payne	40 min
Mar 30, 8:25 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson	50 min
Mar 30, 8:29 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	46 min
Mar 30, 8:44 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, McClain, Stephens	46 min
Mar 30, 9:09 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Murray	66 min
Mar 30, 9:18 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Pottawatomie	42 min
Mar 30, 9:28 PM CDT	Severe Thunderstorm Warning	OUN	Love	47 min
Mar 30, 9:42 PM CDT	Severe Thunderstorm Warning	OUN	Pontotoc, Pottawatomie, Seminole	48 min
Mar 30, 10:07 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Garvin, Johnston, Murray, Pontotoc	38 min
Mar 30, 10:22 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	38 min
Mar 30, 10:27 PM CDT	Severe Thunderstorm Warning	OUN	Coal	48 min
Mar 31, 3:53 PM CDT	Fire Weather Watch	OUN	Cotton, Greer, Harmon, Jackson, Tillman	13 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2009 Every severe thunderstorm warning in 2009

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.