Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 415, NWS Norman, OK

June 25, 201818 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 25, 2018, 2:05 AM CDT for 18 counties in Oklahoma. It was in force for 40 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 25, 2018, 2:05 AM CDT (07:05 UTC)
Expired: Jun 25, 2018, 2:45 AM CDT
In force: 40 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Kay County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Pottawatomie County, OK, Stephens County, OK

The radar

The Norman radar (KTLX), 44 km from the middle of the area, began a volume at 07:04 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 24, 10:08 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 25, 12:31 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 7.1 hours before the alert went out and 51 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: 218 J/kg
Mixed-layer CIN: -476 J/kg
Mixed-layer LCL: 2275 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 192 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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 25, 12:56 AM CDT, 1 hour 9 minutes earlier.

Area forecast discussion, Jun 25, 12:56 AM CDT, 1 hour 9 minutes before

Area Forecast Discussion
National Weather Service Norman OK
1256 AM CDT Mon Jun 25 2018

.AVIATION...
MCS moving across northwestern Oklahoma will likely impact
all TAFS sites through 12z Monday.  Several reports across
northwest Oklahoma of 65 to 75 mph winds from the north
and northwest. Storms may weaken some as they move into central
and southern Oklahoma, but still may see severe winds (50 knots)
at PNC/OKC/OUN between 8-10z.

Thunderstorms will lower visibility to around 1 mile with
MVFR ceilings likely. Storms should be clear of all sites by
12-14Z.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  72  95  78 100 /  50  10   0   0
Hobart OK         72  99  78 103 /  30  10  10   0
Wichita Falls TX  76  99  80 103 /  40   0   0   0
Gage OK           69  98  76 102 /  10   0  10   0
Ponca City OK     72  96  78 102 /  50  10  10   0
Durant OK         75  95  78  98 /  20   0   0   0

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...None.
TX...None.
&&

Hazardous weather outlook, Jun 24, 10:34 PM CDT, 3 hours 31 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
1034 PM CDT Sun Jun 24 2018

OKZ004>048-050>052-TXZ083>090-260345-
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-
1034 PM CDT Sun Jun 24 2018

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 for severe thunderstorms overnight.

Location...
The slight risk is generally along and west of an Alva to Clinton
and Seymour, Texas line. A marginal risk covers the area east of
the slight area to around Interstate 35.

Timing...
After 11 PM through 5 AM Monday.

Impacts...
Damaging wind gusts up to 80 mph.
Heavy rainfall that may cause localized flooding.
Hail up to the size of golf balls.

Discussion...
Thunderstorms over southeastern Colorado and western
Kansas will move through parts of Oklahoma overnight. Strong
damaging winds will be the main risk with some hail and heavy
rainfall possible.

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

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

.Thunderstorms...
There will be a chance for thunderstorms Monday into early
Tuesday. A few strong thunderstorms are possible Monday.

.Heat...
Heat index values from 100 to 105 degrees are forecast through
much of this week. If you will be outdoors, limit strenuous
activities and take frequent breaks.

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

In the hours before

Local storm report, Jun 25, 1:56 AM CDT, 9 minutes before

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Local storm report, Jun 25, 1:57 AM CDT, 8 minutes before

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Local storm report, Jun 25, 1:58 AM CDT, 7 minutes before

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Local storm report, Jun 25, 1:59 AM CDT, 6 minutes before

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Local storm report, Jun 25, 2:03 AM CDT, 2 minutes before

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Local storm report, Jun 25, 2:04 AM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
204 AM CDT MON JUN 25 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0155 AM     TSTM WND GST     3 W GOULD               34.67N 99.83W
06/25/2018  M58 MPH          HARMON             OK   MESONET

&&

SC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 8:47 PM CDT	Special Weather Statement	OUN	Logan	28 min
Jun 24, 9:53 PM CDT	Special Weather Statement	OUN	Roger Mills	37 min
Jun 24, 10:20 PM CDT	Special Weather Statement	OUN	Harper	25 min
Jun 24, 10:32 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woods, Woodward	43 min
Jun 24, 11:01 PM CDT	Special Weather Statement	OUN	Ellis	29 min
Jun 24, 11:11 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Roger Mills, Woods, Woodward	49 min
Jun 24, 11:54 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Custer, Dewey, Ellis, Harper, Major and 3 more	51 min
Jun 25, 12:37 AM CDT	Special Weather Statement	OUN	Roger Mills	38 min
Jun 25, 12:41 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Blaine, Caddo, Canadian, Custer, Dewey and 6 more	49 min
Jun 25, 12:45 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Greer, Kiowa, Roger Mills, Washita	45 min
Jun 25, 1:24 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Cleveland, Garfield, Grady and 8 more	51 min
Jun 25, 1:29 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Blaine, Caddo, Custer, Kiowa, Roger Mills and 1 more	46 min
Jun 25, 1:31 AM CDT	Special Weather Statement	OUN	Beckham, Greer, Harmon, Jackson	29 min
Jun 25, 1:56 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Blaine, Caddo, Comanche, Cotton, Custer and 8 more	49 min
Jun 25, 2:44 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Cleveland, Garvin, Grady, Lincoln and 7 more	46 min
Jun 25, 2:47 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Cotton, Grady, Greer, Harmon and 6 more	43 min
Jun 25, 3:29 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie, Seminole	46 min
Jun 25, 3:31 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Jefferson, Stephens, Tillman	44 min
Jun 25, 3:41 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain, Murray, Pontotoc, Pottawatomie and 1 more	49 min
Jun 25, 4:19 AM CDT	Special Weather Statement	OUN	Carter, Jefferson, Johnston, Love, Marshall, Murray	41 min
Jun 25, 4:34 AM CDT	Special Weather Statement	OUN	Coal, Hughes, Pontotoc, Seminole	26 min
Jun 25, 4:56 AM CDT	Areal Flood Advisory	OUN	Comanche, Cotton, Tillman	3 hr
Jun 25, 6:44 AM CDT	River Flood Warning	OUN	Major, Woods, Woodward	45 hr
Jun 25, 6:46 AM CDT	River Flood Warning	OUN	Dewey, Major, Woodward	26 hr
Jun 25, 7:22 AM CDT	Special Weather Statement	OUN	Caddo, Kiowa	53 min
Jun 25, 8:30 AM CDT	River Flood Warning	OUN	Kingfisher, Logan	49 hr

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.