Alert archive / Oklahoma / Special Weather Statements in 2017

Special Weather Statement, NWS Norman, OK

August 15, 2017Seminole County, Oklahoma

NWS Norman, OK issued this special weather statement at Aug 15, 2017, 8:39 PM CDT for Seminole County, Oklahoma. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 15, 2017, 8:39 PM CDT (01:39 UTC)
Expired: Aug 15, 2017, 9:15 PM CDT
In force: 36 min
Issued by: NWS Norman, OK

County Seminole County, OK

The radar

The Norman radar (KTLX), 78 km from the middle of the area, began a volume at 01:42 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

Springfield, MO (KSGF), launched 00:00Z, 1.7 hours before the alert went out and 328 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: 972 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1073 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 3 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 15, 5:54 PM CDT, 2 hours 45 minutes earlier.

Area forecast discussion, Aug 15, 5:54 PM CDT, 2 hours 45 minutes before

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Hazardous weather outlook, Aug 15, 11:02 AM CDT, 9 hours 37 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
1102 AM CDT Tue Aug 15 2017

OKZ004>048-050>052-TXZ083>090-161615-
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-
1102 AM CDT Tue Aug 15 2017

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

.DAY ONE...Today and Tonight...

.Thunderstorms...
Scattered thunderstorms will be possible over central and northern
OK this afternoon and evening. A few of these storms may become
strong to severe with a threat of damaging wind gusts and hail.
Very heavy rainfall may also result in localized flooding.

Thunderstorm chances will increase across southern Oklahoma and
western north Texas through tonight. Localized heavy rainfall will
be the main threat with these storms.

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

.Thunderstorms...
Thunderstorms will be possible each day through Sunday. A few
strong to severe storms will be possible across northern into
central sections of Oklahoma Wednesday evening.

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 15, 5:28 PM CDT, 3 hours 11 minutes before

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Special weather statement, Aug 15, 5:59 PM CDT, 2 hours 40 minutes before

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Special weather statement, Aug 15, 6:14 PM CDT, 2 hours 25 minutes before

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Special weather statement, Aug 15, 6:27 PM CDT, 2 hours 12 minutes before

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Special weather statement, Aug 15, 8:12 PM CDT, 27 minutes before

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Special weather statement, Aug 15, 8:39 PM CDT, 0 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 15, 8:12 PM CDT	Special Weather Statement	OUN	Murray	33 min
Aug 15, 9:15 PM CDT	Special Weather Statement	OUN	Hughes	30 min
Aug 15, 9:28 PM CDT	Areal Flood Advisory	OUN	Pontotoc, Seminole	3 hr
Aug 15, 9:41 PM CDT	Flash Flood Warning	OUN	Pontotoc, Seminole	3 hr
Aug 16, 2:12 PM CDT	Flood Watch	OUN	Cleveland, Hughes, Kay, Lincoln, Logan, McClain and 6 more	14 hr
Aug 16, 4:47 PM CDT	Special Weather Statement	OUN	Alfalfa	28 min
Aug 16, 5:23 PM CDT	Special Weather Statement	OUN	Major	37 min
Aug 16, 5:32 PM CDT	Severe Thunderstorm Warning	OUN	Major	43 min
Aug 16, 5:47 PM CDT	Special Weather Statement	OUN	Kay	28 min
Aug 16, 5:48 PM CDT	Special Weather Statement	OUN	Grant	27 min
Aug 16, 5:54 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major	36 min
Aug 16, 5:59 PM CDT	Special Weather Statement	OUN	Grant	31 min
Aug 16, 6:14 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major	46 min
Aug 16, 6:19 PM CDT	Special Weather Statement	OUN	Dewey	26 min
Aug 16, 6:29 PM CDT	Special Weather Statement	OUN	Kay	31 min
Aug 16, 6:36 PM CDT	Severe Thunderstorm Warning	OUN	Dewey	39 min
Aug 16, 6:54 PM CDT	Severe Thunderstorm Warning	OUN	Kay	51 min
Aug 16, 6:59 PM CDT	Special Weather Statement	OUN	Major	31 min

Nearby

Special Weather Statements in Oklahoma, 2017 Every special weather statement in 2017

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.