Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 274, NWS Norman, OK

June 1, 2007Alfalfa County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 1, 2007, 12:22 AM CDT for Alfalfa County, Oklahoma. It was in force for 38 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: Jun 1, 2007, 12:22 AM CDT (05:22 UTC)
Expired: Jun 1, 2007, 1:00 AM CDT
In force: 38 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

County Alfalfa County, OK

The radar

The Vance AFB radar (KVNX), 18 km from the middle of the area, began a volume at 05:23 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
May 31, 9:38 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

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 May 31, 8:18 PM CDT, 4 hours 4 minutes earlier.

Area forecast discussion, May 31, 8:18 PM CDT, 4 hours 4 minutes before

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Hazardous weather outlook, May 31, 8:50 PM CDT, 3 hours 32 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
850 PM CDT THU MAY 31 2007

OKZ004>048-050>052-TXZ083>090-011200-
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-
850 PM CDT THU MAY 31 2007

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

.DAY ONE...TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS ACROSS NORTHWEST
OKLAHOMA... AND A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER WESTERN
NORTH TEXAS AND MOST OF THE REST OF WESTERN... CENTRAL... AND
NORTHERN OKLAHOMA.

LOCATION...
THE MODERATE RISK AREA IS NORTHWEST OF A LINE FROM CHEROKEE TO
CLINTON TO ERICK. THE SLIGHT RISK IS NORTHWEST OF A LINE FROM
COALGATE TO MADILL.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE NOW THROUGH 7
AM.

IMPACTS...
DAMAGING WINDS... POSSIBLY IN EXCESS OF 75 MPH... WILL BE THE MAIN
CONCERN OVERNIGHT. HAIL TO THE SIZE OF GOLFBALLS AND A FEW TORNADOES
ALSO WILL BE POSSIBLE.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREAS SHOULD BE READY TO CONDUCT SEVERE WEATHER OPERATIONS WELL
INTO THE NIGHT... AND POSSIBLY THROUGH SUNRISE.

DISCUSSION...
WIDESPREAD SEVERE THUNDERSTORMS... FROM CENTRAL KANSAS SOUTHWESTWARD
INTO THE TEXAS AND OKLAHOMA PANHANDLES AND THE TEXAS SOUTH PLAINS...
WILL MOVE INTO FAR WESTERN OKLAHOMA AND POSSIBLY FAR WESTERN PARTS
OF NORTH TEXAS DURING THE LATTER HALF OF THE EVENING. AN AXIS OF
VERY MOIST AND UNSTABLE AIR WILL CONTINUE TO SPREAD NORTH AND
NORTHWESTWARD INTO THESE AREAS... AND THIS INFLOW OF UNSTABLE AIR
WILL INCREASE AS A SOUTHERLY LOW LEVEL JET STRENGTHENS THIS EVENING.
THE STRENGTHENING LOW LEVEL WINDS ALSO WILL LEAD TO STRONGER
VERTICAL WIND SHEAR. THEREFORE THE POTENTIAL FOR SEVERE
THUNDERSTORMS... INCLUDING A FEW SUPERCELLS... MAY INCREASE THROUGH
MIDNIGHT.

THUNDERSTORMS OVER THE HIGH PLAINS EVENTUALLY WILL ORGANIZE INTO ONE
OR MORE LARGE COMPLEXES LATER TONIGHT. AS OF MID EVENING... THE MOST
LIKELY AREA FOR DEVELOPMENT OF AN ORGANIZED COMPLEX APPEARED TO BE
IN... OR AROUND... THE AREA FROM SOUTHWESTERN KANSAS INTO NORTHWEST
OKLAHOMA AND THE EASTERN PARTS OF THE OKLAHOMA AND TEXAS PANHANDLES.
FAVORABLE WIND SHEAR AND A SUSTAINED STRONG INFLOW OF MOIST AIR AT
LOW LEVELS OVERNIGHT ARE STRONG INDICATIONS THAT ONCE THE STORMS
FORM INTO A COMPLEX... THEY WILL ACCELERATE TO THE EAST SOUTHEAST.
THIS SCENARIO IS SIMILAR TO THAT OF TUESDAY NIGHT AND EARLY
WEDNESDAY MORNING... BUT THE SETUP TONIGHT APPEARS TO BE EVEN MORE
FAVORABLE FOR DAMAGING WINDS. IT CURRENTLY APPEARS THAT THE CORRIDOR
MOST LIKELY TO EXPERIENCE WIDESPREAD AND POTENTIALLY SIGNIFICANT
WIND DAMAGE WILL BE ACROSS THE MODERATE RISK AREA IN NORTHWEST
OKLAHOMA THROUGH 1 AM... EVENTUALLY STRETCHING EAST AND
SOUTHEASTWARD INTO NORTH CENTRAL.... CENTRAL... AND PARTS OF
SOUTHWESTERN OKLAHOMA AFTER 1 AM.

ALTHOUGH WIND DAMAGE WILL BE THE MAIN CONCERN TONIGHT... THERE WILL
BE A CONTINUING POTENTIAL FOR LARGE HAIL WITH SOME OF THE
THUNDERSTORMS. A FEW TORNADOES WILL BE POSSIBLE OVERNIGHT ALONG THE
LEADING EDGE OF THE THUNDERSTORMS.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT FRIDAY JUN 1.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...90 PERCENT.

OTHER HAZARDOUS WEATHER...
AREAS THAT RECEIVED SUBSTANTIAL RAINFALL WEDNESDAY MORNING WILL BE
PRONE TO FLOODING WITH ANY ADDITIONAL HEAVY THUNDERSTORMS.

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

THUNDERSTORM OUTLOOK...
SEVERAL ROUNDS OF THUNDERSTORMS ARE EXPECTED ACROSS OKLAHOMA AND
WESTERN NORTH TEXAS AS AMPLE MOISTURE AND FAVORABLE WIND SHEAR WILL
CONTINUE THROUGH THE WEEKEND. A COLD FRONT IS EXPECTED TO MOVE INTO
NORTHERN OKLAHOMA LATE FRIDAY AFTERNOON AND PROGRESS ACROSS THE AREA
SATURDAY.  THUNDERSTORMS ARE LIKELY ALONG THE COLD FRONT AND SEVERE
WEATHER IS POSSIBLE. ADDITIONALLY...ANOTHER THUNDERSTORM COMPLEX MAY
DEVELOP SUNDAY EVENING ACROSS WEST TEXAS AND MOVE INTO PARTS OF
SOUTHWEST OKLAHOMA AND WESTERN NORTH TEXAS EARLY MONDAY MORNING.

OTHER HAZARDOUS WEATHER...
HEAVY RAINFALL WILL POSE A FLOOD RISK TO ANY AREAS THAT HAVE
RECEIVED HEAVY RAINS THIS WEEK.

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

24

In the hours before

Special weather statement, May 31, 11:34 PM CDT, 48 minutes before

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Local storm report, May 31, 11:41 PM CDT, 41 minutes before

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Special weather statement, May 31, 11:44 PM CDT, 38 minutes before

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Local storm report, May 31, 11:51 PM CDT, 31 minutes before

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Special weather statement, Jun 1, 12:06 AM CDT, 16 minutes before

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Special weather statement, Jun 1, 12:15 AM CDT, 7 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
May 31, 10:25 PM CDT	Severe Thunderstorm Warning	OUN	Harper	65 min
May 31, 10:45 PM CDT	Severe Thunderstorm Warning	OUN	Ellis	45 min
May 31, 11:21 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Washita	39 min
May 31, 11:22 PM CDT	Severe Thunderstorm Warning	OUN	Woods, Woodward	53 min
May 31, 11:32 PM CDT	Severe Thunderstorm Warning	OUN	Ellis	58 min
May 31, 11:35 PM CDT	Tornado Warning	OUN	Woods	25 min
May 31, 11:58 PM CDT	Tornado Warning	OUN	Woods	32 min
Jun 1, 12:10 AM CDT	Severe Thunderstorm Warning	OUN	Custer	37 min
Jun 1, 12:16 AM CDT	Severe Thunderstorm Warning	OUN	Major, Woodward	59 min
Jun 1, 12:20 AM CDT	Tornado Warning	OUN	Alfalfa	40 min
Jun 1, 12:28 AM CDT	Severe Thunderstorm Warning	OUN	Blaine	47 min
Jun 1, 12:43 AM CDT	Severe Thunderstorm Warning	OUN	Grant	62 min
Jun 1, 1:02 AM CDT	Severe Thunderstorm Warning	OUN	Washita	16 min
Jun 1, 1:03 AM CDT	Severe Thunderstorm Warning	OUN	Tillman	57 min
Jun 1, 1:06 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher	54 min
Jun 1, 1:13 AM CDT	Severe Thunderstorm Warning	OUN	Caddo	47 min
Jun 1, 1:27 AM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble	78 min
Jun 1, 1:41 AM CDT	Severe Thunderstorm Warning	OUN	Blaine	49 min
Jun 1, 1:46 AM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woodward	59 min
Jun 1, 2:10 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher	50 min
Jun 1, 2:55 AM CDT	Severe Thunderstorm Warning	OUN	Payne	50 min
Jun 1, 3:24 AM CDT	High Wind Warning	OUN	Tillman	73 min
Jun 1, 3:26 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	49 min
Jun 1, 4:13 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	47 min
Jun 1, 4:31 PM CDT	Severe Thunderstorm Warning	OUN	Payne	44 min
Jun 1, 4:56 PM CDT	Flash Flood Watch	OUN	Caddo, Canadian, Carter, Cleveland, Comanche, Cotton and 17 more	6 hr
Jun 1, 4:57 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	48 min
Jun 1, 5:08 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Payne	52 min
Jun 1, 5:11 PM CDT	Severe Thunderstorm Warning	OUN	Payne	49 min
Jun 1, 5:42 PM CDT	Severe Thunderstorm Warning	OUN	Grady	63 min
Jun 1, 5:56 PM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	49 min
Jun 1, 6:22 PM CDT	Severe Thunderstorm Warning	OUN	McClain	38 min
Jun 1, 6:31 PM CDT	Severe Thunderstorm Warning	OUN	Major	44 min
Jun 1, 6:39 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland	53 min
Jun 1, 6:42 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	48 min
Jun 1, 6:44 PM CDT	Severe Thunderstorm Warning	OUN	Grady	46 min
Jun 1, 6:44 PM CDT	Severe Thunderstorm Warning	OUN	Payne	35 min
Jun 1, 6:46 PM CDT	Severe Thunderstorm Warning	OUN	Grant	44 min
Jun 1, 6:54 PM CDT	Severe Thunderstorm Warning	OUN	McClain	36 min
May 31, 11:49 PM CDT	Severe Thunderstorm Warning	OUN	Foard	41 min
Jun 1, 12:12 AM CDT	Severe Thunderstorm Warning	OUN	Hardeman	48 min
Jun 1, 12:53 AM CDT	Severe Thunderstorm Warning	OUN	Wilbarger	52 min
Jun 1, 3:12 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	48 min
Jun 1, 3:54 PM CDT	Tornado Warning	OUN	Foard, Hardeman	36 min
Jun 1, 4:28 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman, Wilbarger	47 min
Jun 1, 4:42 PM CDT	Severe Thunderstorm Warning	OUN	Knox	48 min
Jun 1, 5:08 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	67 min
Jun 1, 5:15 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Wilbarger	45 min
Jun 1, 5:17 PM CDT	Severe Thunderstorm Warning	OUN	Knox	43 min
Jun 1, 6:01 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	44 min
Jun 1, 6:28 PM CDT	Severe Thunderstorm Warning	OUN	Wichita, Wilbarger	47 min
Jun 1, 6:45 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	24 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; radar from the NEXRAD Level II archive.