Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 302, NWS Norman, OK

April 23, 2008Alfalfa County, Major County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 23, 2008, 10:59 AM CDT for Alfalfa County, Major County, Oklahoma. It was in force for 31 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 23, 2008, 10:59 AM CDT (15:59 UTC)
Expired: Apr 23, 2008, 11:30 AM CDT
In force: 31 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Alfalfa County, OK, Major County, OK

The radar

The Vance AFB radar (KVNX), 36 km from the middle of the area, began a volume at 15:59 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 23, 9:32 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 12:00Z, 4.0 hours before the alert went out and 86 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: 1813 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 765 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.0

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 23, 4:26 AM CDT, 6 hours 33 minutes earlier.

Area forecast discussion, Apr 23, 4:26 AM CDT, 6 hours 33 minutes before

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Hazardous weather outlook, Apr 22, 12:00 PM CDT, 22 hours 59 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1200 PM CDT TUE APR 22 2008

OKZ004>048-050>052-TXZ083>090-231200-
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 TUE APR 22 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 THROUGH TONIGHT OVER
WESTERN NORTH TEXAS AND SOUTHERN OKLAHOMA.

LOCATION...
THE SLIGHT RISK AREA IS SOUTH OF A LINE FROM CHEYENNE... TO
LAWTON... TO PAULS VALLEY... TO HOLDENVILLE.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS FROM NORTH CENTRAL
TEXAS INTO SOUTHEASTERN OKLAHOMA WILL BE FROM MID AFTERNOON THROUGH
MIDNIGHT. THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS FROM WESTERN
OKLAHOMA SOUTHWARD INTO NORTHWESTERN TEXAS WILL BE AFTER MIDNIGHT.

IMPACTS...
DAMAGING WINDS AND VERY LARGE HAIL... TO GOLFBALL SIZE OR LARGER...
WILL BE POSSIBLE WITH THE MOST INTENSE STORMS THIS AFTERNOON AND
EVENING FROM NORTHERN TEXAS INTO SOUTHEASTERN OKLAHOMA. LATE
TONIGHT... THE MAIN CONCERN OVER WESTERN OKLAHOMA AND WESTERN NORTH
TEXAS WILL BE HAIL TO THE SIZE OF QUARTERS.

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

DISCUSSION...
AT MIDDAY A SLOW-MOVING COLD FRONT WAS LOCATED FROM NORTHEASTERN
OKLAHOMA SOUTHWESTWARD TO JUST EAST AND SOUTH OF THE OKLAHOMA CITY
AREA... AND THEN INTO WESTERN NORTH TEXAS. WARM AND VERY UNSTABLE
AIR WAS IN PLACE SOUTH OF THE FRONT... WHILE WIDESPREAD CLOUDS AND
COOLER AIR WERE CONTRIBUTING TO MUCH MORE STABLE CONDITIONS NORTH OF
THE FRONT. THE FRONT WILL DRIFT SLOWLY SOUTH INTO NORTH CENTRAL
TEXAS AND SOUTH CENTRAL AND SOUTHEASTERN OKLAHOMA BEFORE STALLING BY
THIS EVENING. DAYTIME HEATING AND LOW-LEVEL CONVERGENCE ALONG THE
FRONT ARE EXPECTED TO PROVIDE ENOUGH LIFT AND DESTABILIZATION FOR
THUNDERSTORMS TO DEVELOP NEAR THE FRONT BY AROUND MID AFTERNOON.
STRONGLY UNSTABLE CONDITIONS WILL SUPPORT THE POTENTIAL FOR VERY
LARGE HAIL WITH SOME OF THESE STORMS AS THEY MOVE EAST THROUGH EARLY
EVENING. DAMAGING WINDS ALSO WILL BE POSSIBLE. ALTHOUGH SUPERCELLS
AND ISOLATED TORNADOES NEVER CAN BE RULED OUT COMPLETELY... VERTICAL
WIND PROFILES THIS AFTERNOON AND EVENING ARE EXPECTED TO LEAD TO
MAINLY MULTICELL THUNDERSTORMS... AND THEREFORE LIMITED TORNADO
POTENTIAL.

OVERNIGHT... STRENGTHENING SOUTHERLY LOW LEVEL WINDS ARE EXPECTED
OVER WESTERN TEXAS... RESULTING IN A NORTHWARD TRANSPORT OF LOW
LEVEL MOISTURE INTO THE TEXAS PANHANDLE. THE SURFACE FRONT MAY LIFT
BACK TO THE NORTHWEST AS A WARM FRONT INTO THE TEXAS PANHANDLE AND
WESTERN AND CENTRAL OKLAHOMA OVERNIGHT. ELEVATED THUNDERSTORMS ARE
EXPECTED TO FORM NEAR AND NORTH OF THE WARM FRONT... MOST LIKELY
OVER NORTHWESTERN TEXAS AND FAR WESTERN OKLAHOMA... AND MOVE EAST
AFTER MIDNIGHT. LARGE HAIL WILL BE THE MAIN CONCERN WITH THESE
STORMS.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT WEDNESDAY APR 23.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...70 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...50 PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

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

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS WEDNESDAY AND
WEDNESDAY NIGHT OVER MOST OF OKLAHOMA AND ALL OF WESTERN NORTH TEXAS
AS A RELATIVELY STRONG UPPER LEVEL DISTURBANCE MOVES ACROSS THE
SOUTHERN PLAINS. INCREASING WINDS ALOFT WILL STRENGTHEN THE VERTICAL
WIND SHEAR... ESPECIALLY FROM SOUTHERN OKLAHOMA SOUTHWARD INTO
TEXAS. AT LOW LEVELS... A MOIST... UNSTABLE AIRMASS WILL REMAIN IN
PLACE OVER THESE AREAS. THE RISK OF SEVERE STORMS WILL BE GREATER IN
THESE AREAS THAN FARTHER NORTH. THE POTENTIAL FOR SEVERE WEATHER
ON WEDNESDAY WILL DEPEND ON THE COVERAGE OF RAIN AND THUNDERSTORMS
WEDNESDAY MORNING. IF RAIN IS WIDESPREAD... SEVERE WEATHER POTENTIAL
LATER IN THE DAY WILL DECREASE AND THE GREATER RISK WILL SHIFT
SOUTHWARD. IF RAIN COVERAGE IS NOT EXTENSIVE EARLY WEDNESDAY...
THERE COULD BE SUFFICIENT RECOVERY DURING THE DAY TO SET UP A MORE
SIGNIFICANT SEVERE WEATHER RISK LATE WEDNESDAY FROM SOUTHERN
OKLAHOMA SOUTHWARD.

THUNDERSTORM COVERAGE WILL DECREASE ON THURSDAY... BUT THERE WILL BE
A CONTINUING CHANCE OF THUNDERSTORMS INTO THE WEEKEND.

OTHER HAZARDOUS WEATHER...
NONE.

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

24

In the hours before

Special weather statement, Apr 23, 10:15 AM CDT, 44 minutes before

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Local storm report, Apr 23, 10:28 AM CDT, 31 minutes before

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Special weather statement, Apr 23, 10:33 AM CDT, 26 minutes before

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Special weather statement, Apr 23, 10:47 AM CDT, 12 minutes before

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Local storm report, Apr 23, 10:52 AM CDT, 7 minutes before

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Special weather statement, Apr 23, 10:55 AM CDT, 4 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 23, 7:47 AM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	43 min
Apr 23, 8:29 AM CDT	Severe Thunderstorm Warning	OUN	Kiowa, Washita	46 min
Apr 23, 9:14 AM CDT	Severe Thunderstorm Warning	OUN	Dewey	46 min
Apr 23, 9:28 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Washita	47 min
Apr 23, 10:00 AM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major	45 min
Apr 23, 10:14 AM CDT	Severe Thunderstorm Warning	OUN	Blaine	46 min
Apr 23, 10:40 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey, Major	50 min
Apr 23, 10:47 AM CDT	Severe Thunderstorm Warning	OUN	Woods	43 min
Apr 23, 11:17 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche	43 min
Apr 23, 11:29 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant, Major	61 min
Apr 23, 11:32 AM CDT	Severe Thunderstorm Warning	OUN	Grady	43 min
Apr 23, 12:06 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	39 min
Apr 23, 12:36 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper	39 min
Apr 23, 2:42 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	48 min
Apr 23, 5:24 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	51 min
Apr 23, 6:01 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady, Oklahoma	44 min
Apr 23, 6:09 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Pottawatomie	51 min
Apr 23, 6:18 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher	42 min
Apr 23, 6:55 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie	32 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2008 Every severe thunderstorm warning 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.