Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 525, NWS Norman, OK

June 18, 20174 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 18, 2017, 1:07 AM CDT for 4 counties in Oklahoma. It was in force for 22 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, 2017, 1:07 AM CDT (06:07 UTC)
Expired: Jun 18, 2017, 1:29 AM CDT
In force: 22 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Garfield County, OK, Grant County, OK, Kay County, OK, Noble County, OK

The radar

The Vance AFB radar (KVNX), 59 km from the middle of the area, began a volume at 06:08 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 17, 9:33 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 6.1 hours before the alert went out and 153 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: 3025 J/kg
Mixed-layer CIN: -400 J/kg
Mixed-layer LCL: 1479 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 243 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 Jun 18, 12:11 AM CDT, 56 minutes earlier.

Area forecast discussion, Jun 18, 12:11 AM CDT, 56 minutes before

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Hazardous weather outlook, Jun 17, 11:07 PM CDT, 2 hours before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
1107 PM CDT Sat Jun 17 2017

OKZ004>048-050>052-TXZ083>090-190415-
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-
1107 PM CDT Sat Jun 17 2017

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

.DAY ONE...Tonight...

.Thunderstorms...
There is a Slight Risk of severe thunderstorms tonight
across parts of northern Oklahoma.

Location...
The Slight Risk area is north of a Buffalo to Fairview to Guthrie
to Cushing line. A Marginal Risk area surrounds the Slight Risk
area and is north of a Gage to Watonga to Edmond to Prague line.

Timing...
Now through 5 am.

Impacts...
Damaging winds up to 80 mph are expected to be the main hazard...
Hail up to the size of half dollars...

Discussion...
Isolated to scattered thunderstorms will continue across
northern Oklahoma tonight as they move east or southeast. Some
storms may organize into cluster or lines. Pockets of damaging
winds and perhaps severe hail can be expected with the storms.
Storms may weaken after 3 am tonight as they move towards
central Oklahoma.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...
Storm spotter groups and emergency management personnel
across the risk areas should prepare for severe weather
operations tonight.

.Heavy rainfall/Flooding...
A few locations in northern Oklahoma may get a few inches of
rainfall tonight in a short period of time which could result in
localized flash flooding.

.DAYS TWO THROUGH SEVEN...Sunday through Friday...

.Thunderstorms...
Thunderstorms are possible across portions of central and
southern Oklahoma and western north Texas on Sunday and Sunday
night. A few of these storms could be severe with large hail,
damaging winds, and locally heavy rainfall.

Thunderstorms are also possible across far southern Oklahoma and
western north Texas Monday morning, and across northwestern
Oklahoma Wednesday night.

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

MBS

In the hours before

Special weather statement, Jun 17, 11:06 PM CDT, 2 hours 1 minute before

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Special weather statement, Jun 17, 11:42 PM CDT, 1 hour 25 minutes before

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Special weather statement, Jun 17, 11:56 PM CDT, 1 hour 11 minutes before

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Special weather statement, Jun 18, 12:02 AM CDT, 1 hour 5 minutes before

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Special weather statement, Jun 18, 12:27 AM CDT, 40 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1227 AM CDT SUN JUN 18 2017

OKZ007-008-180600-
Kay OK-Grant OK-
1227 AM CDT SUN JUN 18 2017

...SIGNIFICANT WEATHER ADVISORY FOR west central Kay and eastern
Grant Counties Until 100 AM CDT...

AT 1226 AM CDT, a strong thunderstorm was located near Medford,
moving east at 25 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...

Locations impacted include...
Medford, Lamont, Deer Creek, Renfrow, Jefferson and Nardin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 3688 9736 3675 9739 3659 9751 3674 9796
      3695 9774
TIME...MOT...LOC 0526Z 279DEG 20KT 3679 9772

MAHALE

Special weather statement, Jun 18, 12:48 AM CDT, 19 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1248 AM CDT SUN JUN 18 2017

OKZ007-008-012-013-180630-
Garfield OK-Kay OK-Grant OK-Noble OK-
1248 AM CDT SUN JUN 18 2017

...SIGNIFICANT WEATHER ADVISORY FOR northeastern Garfield...southern
Kay...southeastern Grant and northern Noble Counties Until 130 AM
CDT...

AT 1247 AM CDT, strong thunderstorms were along a line extending from
near Blackwell to 4 miles west of Tonkawa to 4 miles south of Lamont
to near Kremlin, moving east at 35 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 40 MPH...

Locations impacted include...
Ponca City, Blackwell, Tonkawa, Billings, Lamont, Kaw City, Red Rock,
Kremlin, Marland, Hunter, Hillsdale, Kildare, southwestern Kaw Lake,
Nardin, Sooner Lake and Ceres.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 3678 9679 3677 9682 3674 9683 3675 9689
      3668 9693 3670 9704 3668 9706 3660 9704
      3659 9706 3659 9703 3658 9700 3660 9691
      3658 9689 3655 9690 3651 9703 3644 9703
      3639 9740 3657 9800 3677 9755 3688 9742
TIME...MOT...LOC 0547Z 291DEG 31KT 3682 9728 3669 9739 3663 9755 3658
9783

MAHALE

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 17, 9:46 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	59 min
Jun 17, 10:35 PM CDT	Special Weather Statement	OUN	Woods	25 min
Jun 17, 10:42 PM CDT	Severe Thunderstorm Warning	OUN	Woods	13 min
Jun 17, 11:06 PM CDT	Special Weather Statement	OUN	Grant, Kay	39 min
Jun 17, 11:40 PM CDT	Severe Thunderstorm Warning	OUN	Kay	50 min
Jun 17, 11:42 PM CDT	Special Weather Statement	OUN	Alfalfa	33 min
Jun 17, 11:56 PM CDT	Special Weather Statement	OUN	Grant, Noble	49 min
Jun 18, 12:02 AM CDT	Special Weather Statement	OUN	Grant	28 min
Jun 18, 12:27 AM CDT	Special Weather Statement	OUN	Grant	33 min
Jun 18, 12:48 AM CDT	Special Weather Statement	OUN	Kay	42 min
Jun 18, 1:11 AM CDT	Special Weather Statement	OUN	Grant	34 min
Jun 18, 1:41 AM CDT	Special Weather Statement	OUN	Garfield, Noble	34 min
Jun 18, 2:14 AM CDT	Special Weather Statement	OUN	Logan, Noble	31 min
Jun 18, 2:33 AM CDT	Special Weather Statement	OUN	Major	27 min
Jun 18, 2:41 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Noble, Payne	49 min
Jun 18, 3:03 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Major	42 min
Jun 18, 3:28 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	47 min
Jun 18, 3:39 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan, Noble, Payne	51 min
Jun 18, 4:10 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma, Payne	50 min
Jun 18, 4:44 AM CDT	Special Weather Statement	OUN	Grant	31 min
Jun 18, 4:51 AM CDT	Special Weather Statement	OUN	Garfield	24 min
Jun 18, 4:59 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln	46 min
Jun 18, 5:01 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Noble	44 min
Jun 18, 5:10 AM CDT	Special Weather Statement	OUN	Kay	35 min
Jun 18, 5:43 AM CDT	Special Weather Statement	OUN	Payne	47 min
Jun 18, 5:46 AM CDT	Special Weather Statement	OUN	Lincoln	14 min
Jun 18, 5:59 AM CDT	Special Weather Statement	OUN	Payne	31 min
Jun 18, 6:11 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan	49 min
Jun 18, 6:20 AM CDT	Special Weather Statement	OUN	Noble	25 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2017 Every severe thunderstorm warning 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.