Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 513, NWS Norman, OK

August 14, 2018Grady County, McClain County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 14, 2018, 2:11 PM CDT for Grady County, McClain County, Oklahoma. It was in force for 49 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: Aug 14, 2018, 2:11 PM CDT (19:11 UTC)
Expired: Aug 14, 2018, 3:00 PM CDT
In force: 49 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Grady County, OK, McClain County, OK

The radar

The Norman radar (KTLX), 50 km from the middle of the area, began a volume at 19:12 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 12:00Z, 7.2 hours before the alert went out and 33 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: 1130 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 737 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.4

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 Aug 14, 12:43 PM CDT, 1 hour 28 minutes earlier.

Area forecast discussion, Aug 14, 12:43 PM CDT, 1 hour 28 minutes before

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Hazardous weather outlook, Aug 14, 11:59 AM CDT, 2 hours 12 minutes before

Hazardous Weather Outlook
National Weather Service Norman OK
1159 AM CDT Tue Aug 14 2018

OKZ004>048-050>052-TXZ083>090-151700-
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-
1159 AM CDT Tue Aug 14 2018

This hazardous weather outlook is for portions of northern...
western...central...and southern Oklahoma...and western north
Texas.

.DAY ONE...This afternoon and tonight...

.Thunderstorms...
This afternoon and evening, a few strong to perhaps severe
thunderstorms may develop across southwest, central and north
central Oklahoma. The stronger storms may produce damaging wind
gusts over 60 mph, hail larger than quarters, and locally heavy
rainfall. Thunderstorm intensity will decrease around sunset. The
most likely time for strong to severe storms will be from 4 pm
through 9 pm.

.Heavy Rainfall and Flooding...
Locally heavy rainfall amounts will occur with thunderstorms today
and this could lead to flooding in some areas.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

.Thunderstorms...
A few thunderstorms are possible Wednesday and Thursday, but
better chances will begin Thursday night and continue through
Monday. Severe storms are unlikely during this period.

Get graphics and more details at weather.gov/norman...and follow
our weather forecast office on Twitter and Facebook.

In the hours before

Special weather statement, Aug 14, 8:29 AM CDT, 5 hours 42 minutes before

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Special weather statement, Aug 14, 9:03 AM CDT, 5 hours 8 minutes before

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Special weather statement, Aug 14, 9:24 AM CDT, 4 hours 47 minutes before

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Special weather statement, Aug 14, 10:03 AM CDT, 4 hours 8 minutes before

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Special weather statement, Aug 14, 10:24 AM CDT, 3 hours 47 minutes before

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Special weather statement, Aug 14, 1:52 PM CDT, 19 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
Aug 14, 5:11 AM CDT	Special Weather Statement	OUN	Harper	49 min
Aug 14, 5:56 AM CDT	Special Weather Statement	OUN	Ellis	49 min
Aug 14, 6:23 AM CDT	Areal Flood Advisory	OUN	Ellis, Harper	2 hr
Aug 14, 6:25 AM CDT	Special Weather Statement	OUN	Ellis	50 min
Aug 14, 7:26 AM CDT	Special Weather Statement	OUN	Alfalfa	34 min
Aug 14, 7:56 AM CDT	Special Weather Statement	OUN	Garfield, Grant	34 min
Aug 14, 8:29 AM CDT	Special Weather Statement	OUN	Grant	31 min
Aug 14, 9:03 AM CDT	Special Weather Statement	OUN	Kay	27 min
Aug 14, 9:24 AM CDT	Special Weather Statement	OUN	Kay	36 min
Aug 14, 10:03 AM CDT	Special Weather Statement	OUN	Noble	27 min
Aug 14, 10:24 AM CDT	Special Weather Statement	OUN	Noble	21 min
Aug 14, 1:52 PM CDT	Special Weather Statement	OUN	Cleveland	38 min
Aug 14, 2:18 PM CDT	Areal Flood Advisory	OUN	Grady, McClain	3 hr
Aug 14, 2:53 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	52 min
Aug 14, 3:09 PM CDT	Areal Flood Advisory	OUN	Cleveland, McClain	3 hr
Aug 14, 3:19 PM CDT	Special Weather Statement	OUN	Payne	56 min
Aug 14, 3:27 PM CDT	Special Weather Statement	OUN	Oklahoma	48 min
Aug 14, 3:41 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan	49 min
Aug 14, 4:39 PM CDT	Special Weather Statement	OUN	Oklahoma	36 min
Aug 14, 4:43 PM CDT	Special Weather Statement	OUN	Lincoln	47 min
Aug 14, 4:57 PM CDT	Special Weather Statement	OUN	Kingfisher	48 min
Aug 14, 5:08 PM CDT	Special Weather Statement	OUN	Kingfisher	37 min
Aug 14, 5:10 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	50 min
Aug 14, 5:15 PM CDT	Special Weather Statement	OUN	Dewey	30 min
Aug 14, 5:24 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey	51 min
Aug 14, 5:25 PM CDT	Special Weather Statement	OUN	Blaine	35 min
Aug 14, 5:32 PM CDT	Areal Flood Advisory	OUN	Canadian, Cleveland, Oklahoma	3 hr
Aug 14, 5:33 PM CDT	Special Weather Statement	OUN	Oklahoma	27 min
Aug 14, 5:38 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Oklahoma	52 min
Aug 14, 5:50 PM CDT	Flash Flood Warning	OUN	Cleveland, Oklahoma	3 hr
Aug 14, 5:52 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher	38 min
Aug 14, 6:06 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma	39 min
Aug 14, 6:09 PM CDT	Special Weather Statement	OUN	Cotton	36 min
Aug 14, 6:14 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey	46 min
Aug 14, 6:25 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	50 min
Aug 14, 6:31 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher, Logan, Oklahoma	44 min
Aug 14, 6:52 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Oklahoma	38 min
Aug 14, 6:58 PM CDT	Flash Flood Warning	OUN	Canadian, Kingfisher, Logan, Oklahoma	3 hr
Aug 14, 4:23 PM CDT	Special Weather Statement	OUN	Wichita	37 min
Aug 14, 6:10 PM CDT	Special Weather Statement	OUN	Wichita	35 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2018 Every severe thunderstorm warning in 2018

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.