Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 466, NWS Norman, OK

July 15, 2018Canadian County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 15, 2018, 8:10 PM CDT for Canadian County, Oklahoma. It was in force for 23 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: Jul 15, 2018, 8:10 PM CDT (01:10 UTC)
Expired: Jul 15, 2018, 8:33 PM CDT
In force: 23 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Canadian County, OK

The radar

The Norman radar (KTLX), 68 km from the middle of the area, began a volume at 01:14 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

Dodge City, (KDDC), launched 00:00Z, 1.2 hours before the alert went out and 301 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: 719 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 2124 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 15, 6:39 PM CDT, 1 hour 31 minutes earlier.

Area forecast discussion, Jul 15, 6:39 PM CDT, 1 hour 31 minutes before

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Hazardous weather outlook, Jul 15, 11:48 AM CDT, 8 hours 22 minutes before

Hazardous Weather Outlook
National Weather Service Norman OK
1148 AM CDT Sun Jul 15 2018

OKZ004>048-050>052-TXZ083>090-161700-
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-
1148 AM CDT Sun Jul 15 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...
Scattered showers and thunderstorms will continue to develop
across parts of the area today. The stronger storms will produce
gusty winds, small hail and very heavy rainfall. Brief severe
storms are possible, but organized severe weather is not expected.

.Heat...
Heat index values will climb into the 98 to 107 range this
afternoon

.DAYS TWO THROUGH SEVEN...Monday through Saturday...

.Heat...
Heat index values will approach or exceed 100 degrees each
afternoon this week. Values may approach 110 in some areas on
Wednesday, Thursday and Friday afternoons.

.Thunderstorms...
Scattered thunderstorms will persist through Wednesday, although
storms are not expected to be widespread. The strongest storms
will be capable of producing strong and gusty winds as well as
locally heavy rainfall.

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, Jul 15, 5:52 PM CDT, 2 hours 18 minutes before

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Special weather statement, Jul 15, 6:08 PM CDT, 2 hours 2 minutes before

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Special weather statement, Jul 15, 6:43 PM CDT, 1 hour 27 minutes before

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Special weather statement, Jul 15, 6:46 PM CDT, 1 hour 24 minutes before

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Special weather statement, Jul 15, 6:54 PM CDT, 1 hour 16 minutes before

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Special weather statement, Jul 15, 6:58 PM CDT, 1 hour 12 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
Jul 15, 7:31 PM CDT	Special Weather Statement	OUN	Grady	29 min
Jul 15, 7:32 PM CDT	Special Weather Statement	OUN	Canadian	28 min
Jul 15, 7:37 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	38 min
Jul 15, 7:45 PM CDT	Special Weather Statement	OUN	Blaine	30 min
Jul 15, 8:02 PM CDT	Special Weather Statement	OUN	Canadian	28 min
Jul 15, 8:32 PM CDT	Special Weather Statement	OUN	Canadian	28 min
Jul 15, 9:10 PM CDT	Special Weather Statement	OUN	Kingfisher	35 min
Jul 16, 3:39 AM CDT	Heat Advisory	OUN	Atoka, Bryan, Canadian, Carter, Cleveland, Coal and 18 more	15 hr
Jul 16, 9:25 AM CDT	Special Weather Statement	OUN	Kay	50 min
Jul 16, 2:37 PM CDT	Special Weather Statement	OUN	Pottawatomie	23 min
Jul 16, 2:47 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie	28 min
Jul 16, 4:51 PM CDT	Special Weather Statement	OUN	Canadian	24 min
Jul 16, 6:00 PM CDT	Special Weather Statement	OUN	Harper	30 min
Jul 16, 6:28 PM CDT	Special Weather Statement	OUN	Garfield	17 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.