Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 267, NWS Norman, OK

May 7, 2015Greer County, Jackson County, Kiowa County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 7, 2015, 1:33 AM CDT for Greer County, Jackson County, Kiowa County, Oklahoma. It was in force for 42 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: May 7, 2015, 1:33 AM CDT (06:33 UTC)
Expired: May 7, 2015, 2:15 AM CDT
In force: 42 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Greer County, OK, Jackson County, OK, Kiowa County, OK

The radar

The Altus AFB radar (KFDR), 59 km from the middle of the area, began a volume at 06:36 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, 6.6 hours before the alert went out and 181 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: 1821 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 916 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 246 m²/s²
0-3 km storm-relative helicity: 343 m²/s²
Significant tornado parameter: 3.0
Supercell composite: 19.3

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 May 7, 12:54 AM CDT, 39 minutes earlier.

Area forecast discussion, May 7, 12:54 AM CDT, 39 minutes before

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Hazardous weather outlook, May 6, 10:47 PM CDT, 2 hours 46 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE NORMAN OK
1047 PM CDT WED MAY 6 2015

OKZ004>048-050>052-TXZ083>090-080400-
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-
1047 PM CDT WED MAY 6 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN...
WESTERN...CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH
TEXAS.

.DAY ONE...REST OF TONIGHT...

.THUNDERSTORMS...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF
WESTERN AND CENTRAL OKLAHOMA AND WESTERN NORTH TEXAS.

LOCATION...
THE SLIGHT RISK AREA IS GENERALLY ALONG AND EAST OF A LINE FROM
FREEDOM TO ELK CITY... TO HOLLIS TO QUANAH TEXAS... AND THEN WEST
OF A LINE FROM PONCA CITY AND STILLWATER... TO SHAWNEE AND
SULPHUR... TO SEMINOLE TO ARDMORE OKLAHOMA. THIS INCLUDES PLACES
SUCH AS ENID... THE OKLAHOMA CITY METRO... LAWTON... AND WICHITA
FALLS.

TIMING...
THROUGH 2 AM

IMPACTS...
HAIL UP TO THE SIZE OF TENNIS BALLS... WIND GUSTS OF 60 TO 70
MPH... AND A FEW TORNADOES... LOCALLY HEAVY RAINFALL HAS AND
WILL... CONTINUE TO CAUSE FLOODING.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...

STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL IN THE
RISK AREAS SHOULD BE READY FOR SEVERE WEATHER OPERATIONS.

DISCUSSION...
SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP ACROSS PORTIONS
OF OKLAHOMA AND WESTERN NORTH TEXAS OVERNIGHT AND INTO THE EARLY
MORNING HOURS. ALTHOUGH ACTIVITY WILL REMAIN SCATTERED... ANY
STORM THAT DEVELOPS WILL HAVE A HIGH PROBABILITY OF BECOMING
SEVERE. VERY LARGE HAIL... DAMAGING WIND GUSTS AND THE CHANCE FOR
A FEW TORNADOES REMAINS... ESPECIALLY ACROSS SOUTHWESTERN OKLAHOMA
AN WESTERN NORTH TEXAS. ADDITIONAL HEAVY RAINFALL MAY ALSO
INCREASE THE ONGOING FLOOD ISSUES. THUNDERSTORM INTENSITY IS
EXPECTED TO GRADUALLY WEAKEN DURING THE OVERNIGHT HOURS... BUT
STORMS MAY STILL PRODUCE LOCALLY HEAVY RAINFALL AND SOME HAIL.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

.THUNDERSTORMS...
A VERY ACTIVE WEATHER PATTERN WILL REMAIN IN PLACE THROUGH AT
LEAST SUNDAY. SEVERE STORMS WILL BE POSSIBLE EACH DAY...ESPECIALLY
DURING THE MID AFTERNOON INTO THE LATE EVENING. AT THIS
TIME...SATURDAY MAY HAVE THE GREATEST POTENTIAL FOR SEVERE WEATHER
AS A STRONG STORM SYSTEM APPROACHES THE SOUTHERN PLAINS.

GET GRAPHICS AND MORE DETAILS AT WEATHER.GOV/NORMAN...AND FOLLOW
OUR WEATHER FORECAST OFFICE ON TWITTER AND FACEBOOK.

KURTZ

In the hours before

Local storm report, May 7, 12:06 AM CDT, 1 hour 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1206 AM CDT THU MAY 07 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1200 AM     NON-TSTM WND GST 4 NW WALTERS            34.40N 98.36W
05/07/2015  E58 MPH          COTTON             OK   MESONET

&&

MBS

Special weather statement, May 7, 12:19 AM CDT, 1 hour 14 minutes before

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Local storm report, May 7, 12:57 AM CDT, 36 minutes before

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Local storm report, May 7, 12:59 AM CDT, 34 minutes before

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Special weather statement, May 7, 1:09 AM CDT, 24 minutes before

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Special weather statement, May 7, 1:11 AM CDT, 22 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 6, 7:00 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	45 min
May 6, 7:00 PM CDT	Tornado Warning	OUN	Major	30 min
May 6, 7:02 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	43 min
May 6, 7:09 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	51 min
May 6, 7:24 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Kiowa	51 min
May 6, 7:25 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Dewey, Major, Woods	50 min
May 6, 7:25 PM CDT	Tornado Warning	OUN	Grady	35 min
May 6, 7:27 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	48 min
May 6, 7:27 PM CDT	Tornado Warning	OUN	Grant	33 min
May 6, 7:29 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	31 min
May 6, 7:35 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Stephens, Tillman	40 min
May 6, 7:45 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	45 min
May 6, 7:57 PM CDT	Tornado Warning	OUN	Oklahoma	33 min
May 6, 7:59 PM CDT	Tornado Warning	OUN	Canadian, Grady	46 min
May 6, 8:04 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	41 min
May 6, 8:14 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	46 min
May 6, 8:16 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	44 min
May 6, 8:25 PM CDT	Tornado Warning	OUN	Cleveland, Oklahoma	35 min
May 6, 8:28 PM CDT	Tornado Warning	OUN	Grady, McClain	32 min
May 6, 8:34 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	41 min
May 6, 8:36 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Jackson, Kiowa, Tillman	39 min
May 6, 8:51 PM CDT	River Flood Warning	OUN	Oklahoma	27 hr
May 6, 8:51 PM CDT	River Flood Warning	OUN	Lincoln, Oklahoma, Pottawatomie	42 hr
May 6, 8:55 PM CDT	River Flood Warning	OUN	Cleveland, McClain, Pottawatomie	37 hr
May 6, 8:56 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Woods	49 min
May 6, 9:12 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Oklahoma	48 min
May 6, 9:19 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Jackson, Kiowa, Tillman, Washita	41 min
May 6, 9:28 PM CDT	Tornado Warning	OUN	Cleveland, Oklahoma	32 min
May 6, 9:44 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	46 min
May 6, 9:48 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Kiowa, Washita	42 min
May 6, 9:56 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma, Pottawatomie	49 min
May 6, 10:24 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Washita	51 min
May 6, 10:28 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant, Woods	47 min
May 6, 10:37 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	38 min
May 6, 10:55 PM CDT	Special Weather Statement	OUN	Carter, Jefferson, Love	35 min
May 6, 11:00 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	45 min
May 6, 11:09 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Canadian, Custer	26 min
May 6, 11:14 PM CDT	Severe Thunderstorm Warning	OUN	Seminole	46 min
May 6, 11:16 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	31 min
May 6, 11:20 PM CDT	Tornado Warning	OUN	Seminole	25 min
May 6, 11:43 PM CDT	Areal Flood Advisory	OUN	Hughes, Pottawatomie, Seminole	3 hr
May 6, 11:57 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	48 min
May 7, 12:19 AM CDT	Special Weather Statement	OUN	Cotton, Jefferson, Stephens, Tillman	41 min
May 7, 12:21 AM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	24 min
May 7, 12:52 AM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	38 min
May 7, 1:09 AM CDT	Special Weather Statement	OUN	Jackson	36 min
May 7, 1:11 AM CDT	Special Weather Statement	OUN	Comanche, Stephens	34 min
May 7, 1:26 AM CDT	Severe Thunderstorm Warning	OUN	Tillman	49 min
May 7, 1:56 AM CDT	Special Weather Statement	OUN	Love, Marshall	34 min
May 7, 2:14 AM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa	46 min
May 7, 2:42 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	48 min
May 7, 3:11 AM CDT	Special Weather Statement	OUN	Atoka, Bryan, Coal	49 min
May 7, 4:24 AM CDT	Special Weather Statement	OUN	Comanche	21 min
May 7, 4:30 AM CDT	Special Weather Statement	OUN	Comanche	30 min
May 7, 4:48 AM CDT	Special Weather Statement	OUN	Canadian	27 min
May 7, 4:54 AM CDT	Special Weather Statement	OUN	Cotton	36 min
May 7, 5:06 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton	39 min
May 7, 5:24 AM CDT	River Flood Warning	OUN	Comanche, Cotton	29 hr
May 7, 5:24 AM CDT	River Flood Warning	OUN	Cotton	5 days
May 7, 5:44 AM CDT	Special Weather Statement	OUN	Stephens	31 min
May 7, 6:17 AM CDT	Special Weather Statement	OUN	Stephens	28 min
May 7, 6:52 AM CDT	Special Weather Statement	OUN	Carter	38 min
May 7, 7:37 AM CDT	Special Weather Statement	OUN	Carter, Murray	23 min
May 7, 9:38 AM CDT	River Flood Warning	OUN	Atoka, Bryan	8 days
May 7, 10:58 AM CDT	Special Weather Statement	OUN	Beckham	32 min
May 7, 11:00 AM CDT	Special Weather Statement	OUN	Harmon	30 min
May 7, 11:30 AM CDT	Severe Thunderstorm Warning	OUN	Harmon	30 min
May 7, 11:36 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	21 min
May 7, 11:54 AM CDT	Flood Watch	OUN	Alfalfa, Atoka, Beckham, Blaine, Bryan, Caddo and 37 more	3 days
May 7, 12:08 PM CDT	Special Weather Statement	OUN	Harmon	37 min
May 7, 12:18 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	42 min
May 7, 12:56 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	31 min
May 7, 1:05 PM CDT	Areal Flood Advisory	OUN	Harmon, Jackson	3 hr
May 7, 1:31 PM CDT	Special Weather Statement	OUN	Caddo	29 min
May 7, 1:34 PM CDT	Special Weather Statement	OUN	Jackson	26 min
May 7, 1:48 PM CDT	Areal Flood Advisory	OUN	Greer, Jackson, Kiowa	3 hr
May 7, 2:09 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	40 min
May 7, 2:42 PM CDT	Areal Flood Advisory	OUN	Kiowa, Washita	3 hr
May 7, 3:35 PM CDT	Special Weather Statement	OUN	Caddo	25 min
May 7, 3:36 PM CDT	Special Weather Statement	OUN	Comanche, Tillman	24 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2015 Every severe thunderstorm warning in 2015

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.