Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 155, NWS Norman, OK

May 15, 20184 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 15, 2018, 2:56 PM CDT for 4 counties in Oklahoma. It was in force for 34 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: May 15, 2018, 2:56 PM CDT (19:56 UTC)
Expired: May 15, 2018, 3:30 PM CDT
In force: 34 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.75 in
Wind: 70.0 mph

Counties Carter County, OK, Johnston County, OK, Murray County, OK, Pontotoc County, OK

The radar

The Norman radar (KTLX), 104 km from the middle of the area, began a volume at 19:56 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, 7.9 hours before the alert went out and 97 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: 31 J/kg
Mixed-layer CIN: -367 J/kg
Mixed-layer LCL: 1479 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 223 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 May 15, 2:55 PM CDT, 1 minute earlier.

Area forecast discussion, May 15, 2:55 PM CDT, 1 minute before

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Hazardous weather outlook, May 15, 12:35 PM CDT, 2 hours 21 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
1235 PM CDT Tue May 15 2018

OKZ004>048-050>052-TXZ083>090-161745-
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-
1235 PM CDT Tue May 15 2018

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

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

.Thunderstorms...
There is a Slight Risk of severe thunderstorms across southwest
Oklahoma and western north Texas. The Slight Risk is south and
west of a line from Cheyenne to Altus to Seymour. Surrounding the
Slight Risk is a Marginal Risk that extends as far north and east
as a line from Woodward to Oklahoma City to Durant.

Damaging wind gusts up to 70 mph and large hail up to the size of
golfballs are possible this afternoon and evening in these risk
areas.

Discussion...
Thunderstorms will continue across portions of the area this
afternoon. The great risk of severe storms during the afternoon
will be across southern Oklahoma and portions of north Texas.
Renewed thunderstorm development late this afternoon and evening
is expected in the Texas Panhandle later today. These storms may
evolve into a line or cluster of storms that will move into
southwest Oklahoma and western north Texas this evening.

.Heavy Rainfall and Flash Flooding...
Locally heavy rainfall of 1 to 3 inches in a short period of
time from slow moving thunderstorms may cause flash flooding in
a few locations across Oklahoma and western north Texas today
and tonight.

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

.Thunderstorms...
A few strong to severe thunderstorms are possible Wednesday
through Friday. Western Oklahoma and western north Texas may have
slightly higher chances for severe storms Wednesday through
Friday during the nighttime hours.

Additional strong to severe thunderstorms will likely return to
parts of Oklahoma and north Texas late Saturday with the passage
of a cold front.

Thunderstorms may linger Sunday and Monday across parts of
Oklahoma and north Texas.

.Heavy Rainfall and Flash Flooding...
Locally heavy rainfall of 1 to 2 inches in a short period of time
from slow moving thunderstorms may cause flash flooding in a few
locations across Oklahoma and north Texas on Wednesday as well as
late Saturday.

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, May 15, 1:53 PM CDT, 1 hour 3 minutes before

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Local storm report, May 15, 2:14 PM CDT, 42 minutes before

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Special weather statement, May 15, 2:29 PM CDT, 27 minutes before

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Local storm report, May 15, 2:43 PM CDT, 13 minutes before

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Local storm report, May 15, 2:46 PM CDT, 10 minutes before

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Local storm report, May 15, 2:53 PM CDT, 3 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
May 14, 7:12 PM CDT	Special Weather Statement	OUN	Beckham	33 min
May 14, 7:14 PM CDT	Areal Flood Advisory	OUN	Beckham, Greer, Harmon	3 hr
May 14, 7:14 PM CDT	Special Weather Statement	OUN	Custer	31 min
May 14, 7:18 PM CDT	Severe Thunderstorm Warning	OUN	Beckham	42 min
May 14, 7:19 PM CDT	Special Weather Statement	OUN	Jackson	26 min
May 14, 7:19 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woods, Woodward	41 min
May 14, 7:36 PM CDT	Special Weather Statement	OUN	Jackson, Kiowa	24 min
May 14, 7:39 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon	36 min
May 14, 7:47 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	58 min
May 14, 7:48 PM CDT	Special Weather Statement	OUN	Washita	27 min
May 14, 7:53 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Washita	37 min
May 14, 7:57 PM CDT	Special Weather Statement	OUN	Kiowa	33 min
May 14, 7:58 PM CDT	Severe Thunderstorm Warning	OUN	Kay	47 min
May 14, 8:04 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Custer, Washita	41 min
May 14, 8:16 PM CDT	Severe Thunderstorm Warning	OUN	Grant	59 min
May 14, 8:40 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Grady	50 min
May 14, 8:44 PM CDT	Severe Thunderstorm Warning	OUN	Kay	31 min
May 14, 9:16 PM CDT	Special Weather Statement	OUN	Grant, Kay	29 min
May 14, 9:20 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	70 min
May 14, 9:25 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	35 min
May 14, 9:30 PM CDT	Special Weather Statement	OUN	Comanche	30 min
May 14, 9:41 PM CDT	Special Weather Statement	OUN	Oklahoma	34 min
May 14, 9:56 PM CDT	Special Weather Statement	OUN	Canadian, Grady, Oklahoma	34 min
May 14, 10:00 PM CDT	Special Weather Statement	OUN	Comanche	30 min
May 14, 10:10 PM CDT	Areal Flood Advisory	OUN	Comanche, Cotton, Tillman	3 hr
May 14, 10:21 PM CDT	Special Weather Statement	OUN	Kay	24 min
May 14, 10:25 PM CDT	Severe Thunderstorm Warning	OUN	Kay	25 min
May 14, 10:32 PM CDT	Special Weather Statement	OUN	Comanche, Cotton	28 min
May 14, 10:39 PM CDT	Wind Advisory	OUN	Beckham, Blaine, Caddo, Canadian, Comanche, Custer and 7 more	101 min
May 14, 10:45 PM CDT	Special Weather Statement	OUN	Cleveland	30 min
May 15, 12:09 AM CDT	Special Weather Statement	OUN	Kay	36 min
May 15, 12:51 AM CDT	Special Weather Statement	OUN	Jefferson	24 min
May 15, 2:09 AM CDT	Special Weather Statement	OUN	Bryan	36 min
May 15, 5:28 AM CDT	Special Weather Statement	OUN	Bryan	32 min
May 15, 9:02 AM CDT	Special Weather Statement	OUN	Custer	28 min
May 15, 9:51 AM CDT	Areal Flood Advisory	OUN	Bryan	114 min
May 15, 10:29 AM CDT	Special Weather Statement	OUN	Caddo	31 min
May 15, 11:02 AM CDT	Severe Thunderstorm Warning	OUN	Caddo	43 min
May 15, 11:07 AM CDT	Special Weather Statement	OUN	Canadian	38 min
May 15, 11:10 AM CDT	Special Weather Statement	OUN	Caddo	35 min
May 15, 11:36 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	39 min
May 15, 11:52 AM CDT	Areal Flood Advisory	OUN	Blaine, Caddo, Canadian, Kiowa	3 hr
May 15, 11:54 AM CDT	Special Weather Statement	OUN	Garvin	36 min
May 15, 12:10 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	50 min
May 15, 12:16 PM CDT	Flash Flood Warning	OUN	Caddo	3 hr
May 15, 12:20 PM CDT	Areal Flood Advisory	OUN	Grady	3 hr
May 15, 12:46 PM CDT	Flash Flood Warning	OUN	Grady	3 hr
May 15, 12:53 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, McClain, Stephens	52 min
May 15, 1:34 PM CDT	Special Weather Statement	OUN	Stephens	26 min
May 15, 1:53 PM CDT	Special Weather Statement	OUN	Garvin, Murray	37 min
May 15, 2:10 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Murray, Pontotoc	50 min
May 15, 2:29 PM CDT	Special Weather Statement	OUN	Carter	31 min
May 15, 2:41 PM CDT	Severe Thunderstorm Warning	OUN	Carter	49 min
May 15, 2:49 PM CDT	Areal Flood Advisory	OUN	Garvin	116 min
May 15, 2:52 PM CDT	Areal Flood Advisory	OUN	Murray	3 hr
May 15, 3:07 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Johnston, Love, Marshall	38 min
May 15, 3:24 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Johnston, Pontotoc	51 min
May 15, 3:43 PM CDT	Severe Thunderstorm Warning	OUN	Bryan, Johnston, Marshall	47 min
May 15, 3:54 PM CDT	Special Weather Statement	OUN	Atoka	36 min
May 15, 4:28 PM CDT	Special Weather Statement	OUN	Atoka	32 min
May 14, 10:39 PM CDT	Special Weather Statement	OUN	Clay	36 min
May 14, 10:43 PM CDT	Special Weather Statement	OUN	Wichita	32 min
May 14, 11:09 PM CDT	Special Weather Statement	OUN	Wichita	36 min
May 14, 11:22 PM CDT	Special Weather Statement	OUN	Wichita	53 min
May 14, 11:25 PM CDT	Areal Flood Advisory	OUN	Archer, Wichita	3 hr
May 14, 11:37 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Wichita	23 min
May 14, 11:42 PM CDT	Flash Flood Warning	OUN	Wichita	3 hr
May 15, 12:25 AM CDT	Special Weather Statement	OUN	Clay	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.