Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 127, NWS Norman, OK

April 16, 20155 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 16, 2015, 9:57 PM CDT for 5 counties in Oklahoma. It was in force for 48 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 16, 2015, 9:57 PM CDT (02:57 UTC)
Expired: Apr 16, 2015, 10:45 PM CDT
In force: 48 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Tornado: Possible
Hail: 1.5 in
Wind: 60.0 mph

Counties Beckham County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Roger Mills County, OK

The radar

The Vance AFB radar (KVNX), 160 km from the middle of the area, began a volume at 02:57 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 16, 4:59 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 16, 6:09 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 3.0 hours before the alert went out and 214 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: 301 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 1659 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 142 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

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 Apr 16, 9:24 PM CDT, 33 minutes earlier.

Area forecast discussion, Apr 16, 9:24 PM CDT, 33 minutes before

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Hazardous weather outlook, Apr 16, 9:16 PM CDT, 41 minutes before

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In the hours before

Special weather statement, Apr 16, 8:54 PM CDT, 1 hour 3 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
854 PM CDT THU APR 16 2015

OKZ005-170230-
WOODS OK-
854 PM CDT THU APR 16 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN WOODS COUNTY UNTIL
930 PM CDT...

AT 852 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 4 MILES SOUTH OF
HARDTNER...MOVING NORTHWEST AT 35 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 40 MPH...

THIS STORM WILL REMAIN OVER MAINLY RURAL AREAS OF NORTHEASTERN WOODS
COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

&&

LAT...LON 3691 9854 3688 9869 3700 9879 3700 9854
TIME...MOT...LOC 0152Z 155DEG 30KT 3696 9864

MAHLE

Special weather statement, Apr 16, 9:08 PM CDT, 49 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
908 PM CDT THU APR 16 2015

OKZ006-007-170245-
GRANT OK-ALFALFA OK-
908 PM CDT THU APR 16 2015

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN GRANT AND NORTHEASTERN
ALFALFA COUNTIES UNTIL 945 PM CDT...

AT 906 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES NORTH OF
GREAT SALT PLAINS LAKE...MOVING NORTH AT 20 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 40 MPH...

LOCATIONS IMPACTED INCLUDE...
AMORITA AND BYRON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

&&

LAT...LON 3680 9809 3677 9824 3691 9834 3698 9815
TIME...MOT...LOC 0206Z 168DEG 18KT 3682 9820

MAHALE

Special weather statement, Apr 16, 9:31 PM CDT, 26 minutes before

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Special weather statement, Apr 16, 9:36 PM CDT, 21 minutes before

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Local storm report, Apr 16, 9:41 PM CDT, 16 minutes before

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Special weather statement, Apr 16, 9:54 PM CDT, 3 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 16, 7:07 PM CDT	Special Weather Statement	OUN	Alfalfa	23 min
Apr 16, 7:25 PM CDT	Special Weather Statement	OUN	Beckham	20 min
Apr 16, 7:32 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer	43 min
Apr 16, 7:33 PM CDT	Special Weather Statement	OUN	Woods	27 min
Apr 16, 7:37 PM CDT	Special Weather Statement	OUN	Harper	23 min
Apr 16, 7:40 PM CDT	Special Weather Statement	OUN	Alfalfa	35 min
Apr 16, 7:42 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Ellis, Roger Mills, Woodward	63 min
Apr 16, 7:47 PM CDT	Special Weather Statement	OUN	Woodward	28 min
Apr 16, 8:01 PM CDT	Tornado Warning	OUN	Beckham	29 min
Apr 16, 8:03 PM CDT	Flash Flood Warning	OUN	Woods, Woodward	3 hr
Apr 16, 8:05 PM CDT	Areal Flood Advisory	OUN	Ellis, Roger Mills, Woodward	3 hr
Apr 16, 8:35 PM CDT	Tornado Warning	OUN	Roger Mills	40 min
Apr 16, 8:36 PM CDT	Special Weather Statement	OUN	Alfalfa	24 min
Apr 16, 8:54 PM CDT	Special Weather Statement	OUN	Woods	36 min
Apr 16, 8:58 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	47 min
Apr 16, 9:08 PM CDT	Special Weather Statement	OUN	Alfalfa	37 min
Apr 16, 9:11 PM CDT	Tornado Warning	OUN	Beckham, Roger Mills	49 min
Apr 16, 9:20 PM CDT	Areal Flood Advisory	OUN	Roger Mills	3 hr
Apr 16, 9:31 PM CDT	Special Weather Statement	OUN	Woods	29 min
Apr 16, 9:36 PM CDT	Special Weather Statement	OUN	Woods	24 min
Apr 16, 9:54 PM CDT	Special Weather Statement	OUN	Grant	36 min
Apr 16, 10:01 PM CDT	Special Weather Statement	OUN	Alfalfa	29 min
Apr 16, 10:27 PM CDT	Special Weather Statement	OUN	Alfalfa	33 min
Apr 16, 10:44 PM CDT	Severe Thunderstorm Warning	OUN	Dewey	25 min
Apr 16, 10:52 PM CDT	Special Weather Statement	OUN	Alfalfa	38 min
Apr 16, 11:09 PM CDT	Special Weather Statement	OUN	Grant	36 min
Apr 16, 11:40 PM CDT	Special Weather Statement	OUN	Garfield	35 min
Apr 16, 11:45 PM CDT	Special Weather Statement	OUN	Major	30 min
Apr 16, 11:47 PM CDT	Special Weather Statement	OUN	Grant	28 min
Apr 17, 12:39 AM CDT	Areal Flood Advisory	OUN	Garfield	3 hr
Apr 17, 12:42 AM CDT	Special Weather Statement	OUN	Dewey	33 min
Apr 17, 1:00 AM CDT	Special Weather Statement	OUN	Ellis	30 min
Apr 17, 1:17 AM CDT	Special Weather Statement	OUN	Roger Mills	28 min
Apr 17, 1:25 AM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	50 min
Apr 17, 1:54 AM CDT	Special Weather Statement	OUN	Major	36 min
Apr 17, 2:22 AM CDT	Special Weather Statement	OUN	Dewey	23 min
Apr 17, 2:32 AM CDT	Special Weather Statement	OUN	Garfield	28 min
Apr 17, 2:53 AM CDT	Special Weather Statement	OUN	Dewey, Major	37 min
Apr 17, 3:02 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon, Jackson	43 min
Apr 17, 3:33 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Greer, Harmon, Kiowa, Roger Mills and 1 more	42 min
Apr 17, 3:55 AM CDT	Special Weather Statement	OUN	Jackson	35 min
Apr 17, 4:13 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Dewey, Greer, Kiowa, Roger Mills and 1 more	47 min
Apr 17, 4:20 AM CDT	Areal Flood Advisory	OUN	Beckham, Custer, Dewey, Roger Mills, Washita	3 hr
Apr 17, 4:43 AM CDT	Special Weather Statement	OUN	Jackson	32 min
Apr 17, 5:03 AM CDT	Special Weather Statement	OUN	Washita	27 min
Apr 17, 5:17 AM CDT	Special Weather Statement	OUN	Jackson	28 min
Apr 17, 5:32 AM CDT	River Flood Warning	OUN	Custer, Roger Mills	20 hr
Apr 17, 5:34 AM CDT	Special Weather Statement	OUN	Caddo	26 min
Apr 17, 5:58 AM CDT	Special Weather Statement	OUN	Tillman	32 min
Apr 17, 6:09 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa	51 min
Apr 17, 6:59 AM CDT	Special Weather Statement	OUN	Comanche	31 min
Apr 17, 7:14 AM CDT	Special Weather Statement	OUN	Comanche	46 min
Apr 17, 8:36 AM CDT	Special Weather Statement	OUN	Grady	24 min
Apr 17, 8:37 AM CDT	Special Weather Statement	OUN	Harmon, Jackson, Kiowa, Tillman	38 min
Apr 17, 9:40 AM CDT	Special Weather Statement	OUN	Tillman	50 min
Apr 17, 9:53 AM CDT	Special Weather Statement	OUN	Harmon	37 min
Apr 17, 9:56 AM CDT	Severe Thunderstorm Warning	OUN	Jackson	36 min
Apr 17, 10:08 AM CDT	Special Weather Statement	OUN	Kiowa	37 min
Apr 17, 10:43 AM CDT	Special Weather Statement	OUN	Caddo	32 min
Apr 17, 10:47 AM CDT	Special Weather Statement	OUN	Greer, Jackson	28 min
Apr 17, 11:01 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	26 min
Apr 17, 4:50 PM CDT	Special Weather Statement	OUN	Woodward	25 min
Apr 17, 5:55 PM CDT	Special Weather Statement	OUN	Harper	35 min
Apr 17, 6:05 PM CDT	Special Weather Statement	OUN	Blaine	25 min
Apr 17, 9:05 AM CDT	Special Weather Statement	OUN	Foard	25 min
Apr 17, 9:18 AM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	42 min
Apr 17, 11:24 AM CDT	Severe Thunderstorm Warning	OUN	Knox	40 min
Apr 17, 11:38 AM CDT	Special Weather Statement	OUN	Foard	52 min
Apr 17, 12:06 PM CDT	Special Weather Statement	OUN	Baylor, Foard, Hardeman, Knox, Wilbarger	24 min
Apr 17, 1:51 PM CDT	Special Weather Statement	OUN	Archer	24 min
Apr 17, 3:00 PM CDT	Special Weather Statement	OUN	Knox	30 min
Apr 17, 3:05 PM CDT	Special Weather Statement	OUN	Knox	25 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.