Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 509, NWS Norman, OK

June 18, 2016Blaine County, Custer County, Dewey County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 18, 2016, 4:29 AM CDT for Blaine County, Custer County, Dewey County, Oklahoma. It was in force for 46 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 18, 2016, 4:29 AM CDT (09:29 UTC)
Expired: Jun 18, 2016, 5:15 AM CDT
In force: 46 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Blaine County, OK, Custer County, OK, Dewey County, OK

The radar

The Vance AFB radar (KVNX), 118 km from the middle of the area, began a volume at 09:31 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
Jun 18, 3:33 AM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 9.5 hours before the alert went out and 145 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: 2997 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 1587 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 Jun 18, 3:49 AM CDT, 40 minutes earlier.

Area forecast discussion, Jun 18, 3:49 AM CDT, 40 minutes before

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Hazardous weather outlook, Jun 18, 3:35 AM CDT, 54 minutes before

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In the hours before

Local storm report, Jun 18, 3:30 AM CDT, 59 minutes before

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Local storm report, Jun 18, 3:56 AM CDT, 33 minutes before

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Local storm report, Jun 18, 4:01 AM CDT, 28 minutes before

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Local storm report, Jun 18, 4:06 AM CDT, 23 minutes before

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Local storm report, Jun 18, 4:16 AM CDT, 13 minutes before

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Local storm report, Jun 18, 4:26 AM 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
Jun 18, 2:14 AM CDT	Special Weather Statement	OUN	Harper	31 min
Jun 18, 2:20 AM CDT	Special Weather Statement	OUN	Grant, Kay	25 min
Jun 18, 2:40 AM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods, Woodward	50 min
Jun 18, 3:17 AM CDT	Severe Thunderstorm Warning	OUN	Harper, Major, Woods, Woodward	43 min
Jun 18, 3:54 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Dewey, Major, Woods, Woodward	51 min
Jun 18, 4:45 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Kingfisher, Major	30 min
Jun 18, 4:46 AM CDT	Special Weather Statement	OUN	Woodward	29 min
Jun 18, 4:48 AM CDT	Special Weather Statement	OUN	Grant	27 min
Jun 18, 5:18 AM CDT	Special Weather Statement	OUN	Dewey	27 min
Jun 18, 5:29 AM CDT	Special Weather Statement	OUN	Canadian, Logan, Oklahoma	31 min
Jun 18, 6:03 AM CDT	Special Weather Statement	OUN	Cleveland, Grady, Lincoln, McClain, Oklahoma	27 min
Jun 18, 6:11 AM CDT	Special Weather Statement	OUN	Dewey	34 min
Jun 18, 8:35 AM CDT	Special Weather Statement	OUN	Custer	25 min
Jun 18, 8:57 AM CDT	Special Weather Statement	OUN	Washita	33 min
Jun 18, 11:36 AM CDT	Special Weather Statement	OUN	Washita	24 min
Jun 18, 11:52 AM CDT	Severe Thunderstorm Warning	OUN	Kiowa, Washita	23 min
Jun 18, 2:45 PM CDT	Special Weather Statement	OUN	Oklahoma	30 min
Jun 18, 3:36 PM CDT	Special Weather Statement	OUN	Cleveland	24 min
Jun 18, 3:59 PM CDT	Special Weather Statement	OUN	Oklahoma	16 min
Jun 18, 4:19 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Grady, McClain	56 min
Jun 18, 4:35 PM CDT	Areal Flood Advisory	OUN	Cleveland, McClain	115 min
Jun 18, 4:56 PM CDT	Special Weather Statement	OUN	Grady	19 min
Jun 18, 5:11 PM CDT	Special Weather Statement	OUN	Lincoln	34 min
Jun 18, 5:13 PM CDT	Special Weather Statement	OUN	McClain	32 min
Jun 18, 5:49 PM CDT	Special Weather Statement	OUN	Lincoln	41 min
Jun 18, 5:53 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	37 min
Jun 18, 6:18 PM CDT	Special Weather Statement	OUN	Murray	27 min
Jun 18, 6:27 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Murray	33 min
Jun 18, 6:40 PM CDT	Special Weather Statement	OUN	Atoka	50 min
Jun 18, 6:47 PM CDT	Areal Flood Advisory	OUN	Garvin, Murray	3 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2016 Every severe thunderstorm warning in 2016

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.