Alert archive / Oklahoma / Special Weather Statements in 2012

Special Weather Statement, NWS Norman, OK

May 1, 2012Pottawatomie County, Seminole County, Oklahoma

NWS Norman, OK issued this special weather statement at May 1, 2012, 12:51 AM CDT for Pottawatomie County, Seminole County, Oklahoma. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 1, 2012, 12:51 AM CDT (05:51 UTC)
Expired: May 1, 2012, 1:30 AM CDT
In force: 39 min
Issued by: NWS Norman, OK

Counties Pottawatomie County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 57 km from the middle of the area, began a volume at 05:54 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, 5.9 hours before the alert went out and 69 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: 2178 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1251 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 174 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 10.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at May 1, 12:45 AM CDT, 6 minutes earlier.

Area forecast discussion, May 1, 12:45 AM CDT, 6 minutes before

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Hazardous weather outlook, Apr 30, 10:00 PM CDT, 2 hours 51 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1000 PM CDT MON APR 30 2012

OKZ004>048-050>052-TXZ083>090-011100-
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-
1000 AM CDT MON APR 30 2012

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

.DAY ONE...TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT
ACROSS PORTIONS OF OKLAHOMA AND WESTERN NORTH TEXAS.

LOCATION...
THE SLIGHT RISK AREA INCLUDES ALL OF WESTERN NORTH TEXAS AND THE
PART OF OKLAHOMA NORTHWEST OF A COLAGATE TO MADILL LINE.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE THROUGH
ABOUT 3 AM.

IMPACTS...
VERY LARGE HAIL... LARGER THAN BASEBALLS...DAMAGING WINDS GREATER
THAN 65 MPH... AND ISOLATED TORNADOES.

HEAVY RAIN AND LOCALIZED FLOODING WILL ALSO BE A CONCERN...
ESPECIALLY OVER THE NORTHERN THIRD TO HALF OF OKLAHOMA.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS INTO THE
OVERNIGHT HOURS.

DISCUSSION...
SCATTERED STRONG TO SEVERE THUNDERSTORMS CONTINUE TO DEVELOP AND
MOVE ACROSS OKLAHOMA AND WESTERN NORTH TEXAS. ONE CLUSTER OF STORMS
WILL CONTINUE TO MOVE THROUGH NORTHERN OKLAHOMA WITH
ANOTHER MOVING THROUGH SOUTHWEST OKLAHOMA AND WESTERN NORTH
TEXAS. A MOIST AND UNSTABLE AIRMASS REMAINS IN PLACE AND THE THREAT
FOR SEVERE STORMS WILL CONTINUE WELL INTO THE NIGHT. HAIL TO THE
SIZE OF BASEBALLS AND DAMAGING WIND GUSTS WILL BE THE MAIN THREATS.
TORNADOES WILL BE POSSIBLE...ALTHOUGH THE TORNADO THREAT WILL BEGIN
TO DIMINISH LATER TONIGHT.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT TUESDAY MAY 1.
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...
THUNDERSTORMS WILL PRODUCE LOCALLY HEAVY RAINFALL WHICH COULD LEAD
TO FLASH FLOODING... ESPECIALLY ACROSS NORTHERN OKLAHOMA WHERE
SIGNIFICANT RAINFALL OCCURRED ON SUNDAY AND EARLY MONDAY.

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

THUNDERSTORM OUTLOOK...
THUNDERSTORMS MAY LINGER AFTER SUNRISE ON TUESDAY MORNING ACROSS
NORTH CENTRAL OKLAHOMA... ALTHOUGH SEVERE WEATHER IS NOT EXPECTED.
OTHERWISE... THUNDERSTORM CHANCES REMAIN VERY LOW THROUGH SUNDAY.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 5 AM TUESDAY.

In the hours before

Local storm report, May 1, 12:25 AM CDT, 26 minutes before

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Special weather statement, May 1, 12:25 AM CDT, 26 minutes before

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Special weather statement, May 1, 12:30 AM CDT, 21 minutes before

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Local storm report, May 1, 12:41 AM CDT, 10 minutes before

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Local storm report, May 1, 12:49 AM CDT, 2 minutes before

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Special weather statement, May 1, 12:51 AM CDT, 0 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 30, 7:14 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	46 min
Apr 30, 7:26 PM CDT	Tornado Warning	OUN	Alfalfa	34 min
Apr 30, 7:32 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	58 min
Apr 30, 7:54 PM CDT	Special Weather Statement	OUN	Harmon	36 min
Apr 30, 7:58 PM CDT	Tornado Warning	OUN	Alfalfa, Grant	47 min
Apr 30, 8:09 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon	66 min
Apr 30, 8:17 PM CDT	Special Weather Statement	OUN	Greer, Washita	28 min
Apr 30, 8:23 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Kiowa, Washita	67 min
Apr 30, 8:27 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	63 min
Apr 30, 8:39 PM CDT	Tornado Warning	OUN	Grant	51 min
Apr 30, 9:08 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	52 min
Apr 30, 9:10 PM CDT	Tornado Warning	OUN	Kiowa, Washita	16 min
Apr 30, 9:13 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	62 min
Apr 30, 9:28 PM CDT	Tornado Warning	OUN	Grant, Kay	32 min
Apr 30, 9:32 PM CDT	Special Weather Statement	OUN	Kiowa	43 min
Apr 30, 9:39 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Greer, Jackson, Kiowa, Washita	51 min
Apr 30, 9:40 PM CDT	Tornado Warning	OUN	Grant	35 min
Apr 30, 9:57 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	48 min
Apr 30, 9:58 PM CDT	Tornado Warning	OUN	Grant, Kay	47 min
Apr 30, 10:04 PM CDT	Flash Flood Warning	OUN	Grant, Kay	4 hr
Apr 30, 10:05 PM CDT	Areal Flood Advisory	OUN	Greer, Harmon, Jackson	4 hr
Apr 30, 10:15 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson, Kiowa	60 min
Apr 30, 10:18 PM CDT	Tornado Warning	OUN	Kay	27 min
Apr 30, 10:20 PM CDT	Tornado Warning	OUN	Greer, Harmon, Jackson	14 min
Apr 30, 10:33 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Cotton, Grady, Kiowa, Stephens and 2 more	57 min
Apr 30, 10:36 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	54 min
Apr 30, 10:54 PM CDT	Special Weather Statement	OUN	Blaine, Canadian, Custer, Dewey, Kingfisher	51 min
Apr 30, 11:11 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Greer, Harmon, Jackson, Kiowa and 1 more	53 min
Apr 30, 11:25 PM CDT	Special Weather Statement	OUN	Lincoln	35 min
Apr 30, 11:28 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kay, Noble	51 min
Apr 30, 11:30 PM CDT	Special Weather Statement	OUN	Comanche, Grady, McClain, Stephens	60 min
Apr 30, 11:32 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	43 min
Apr 30, 11:57 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie	48 min
May 1, 12:12 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Pottawatomie, Seminole	34 min
May 1, 12:25 AM CDT	Special Weather Statement	OUN	Dewey	35 min
May 1, 12:30 AM CDT	Special Weather Statement	OUN	Garvin, McClain, Murray, Pontotoc	30 min
May 1, 12:57 AM CDT	Special Weather Statement	OUN	Garvin, Murray, Pontotoc	33 min
May 1, 1:29 AM CDT	Special Weather Statement	OUN	Coal, Hughes, Johnston, Pontotoc, Seminole	46 min
May 1, 2:11 AM CDT	Special Weather Statement	OUN	Coal	49 min
Apr 30, 10:50 PM CDT	Special Weather Statement	OUN	Baylor, Knox	55 min

Nearby

Special Weather Statements in Oklahoma, 2012 Every special weather statement in 2012

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.