Alert archive / Texas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 20, NWS Norman, OK

March 26, 2018Cotton County, Oklahoma; Clay County, Wichita County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Mar 26, 2018, 2:48 PM CDT for Cotton County, Oklahoma; Clay County, Wichita County, Texas. It was in force for 25 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: Mar 26, 2018, 2:48 PM CDT (19:48 UTC)
Expired: Mar 26, 2018, 3:13 PM CDT
In force: 25 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Cotton County, OK, Clay County, TX, Wichita County, TX

The radar

The Altus AFB radar (KFDR), 63 km from the middle of the area, began a volume at 19:51 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
Mar 26, 12:37 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 7.8 hours before the alert went out and 169 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: 215 J/kg
Mixed-layer CIN: -417 J/kg
Mixed-layer LCL: 624 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 278 m²/s²
0-3 km storm-relative helicity: 214 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.9

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 Mar 26, 2:29 PM CDT, 19 minutes earlier.

Area forecast discussion, Mar 26, 2:29 PM CDT, 19 minutes before

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Hazardous weather outlook, Mar 26, 11:58 AM CDT, 2 hours 50 minutes before

Hazardous Weather Outlook
National Weather Service Norman OK
1158 AM CDT Mon Mar 26 2018

OKZ004>048-050>052-TXZ083>090-271700-
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-
1158 AM CDT Mon Mar 26 2018

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

.DAY ONE...Through Tonight...

.Thunderstorms...
There is an Enhanced Risk of severe thunderstorms across portions
of southwest Oklahoma and western north Texas. A Slight Risk
surrounds the Enhanced Risk and is primarily located across
central and southwest Oklahoma and western north Texas.

Large hail up to the size of tennis balls and damaging wind gusts
to 70 mph will be the primary hazards with the strongest storms.
The tornado risk is very low.

Thunderstorms will continue to develop across western north Texas
and southwest Oklahoma through this afternoon. These
thunderstorms are expected to spread into central Oklahoma between
5 to 9 PM and southeast Oklahoma after 9 PM.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...
Storm spotter groups and emergency management personnel across
western north Texas, southwest Oklahoma, and central Oklahoma
should prepare for severe weather operations this afternoon and
evening.

.Heavy Rainfall...
Heavy rain may cause localized flooding, generally along and
southeast of I-44 and east of I-35, this evening and overnight. A
Flood Watch is in effect.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday...

.Heavy Rainfall...
Heavy rain will continue into early Tuesday, while shifting
farther southeast, mainly affecting south-central and southeast
Oklahoma on Tuesday. A Flood Watch is in effect for southeast and
south central Oklahoma through Tuesday evening.

.Thunderstorms...
There is a Marginal Risk for severe thunderstorms Tuesday in
far southeast Oklahoma.

Otherwise, there will continue to be a chance of thunderstorms
Wednesday, and again on Sunday. Storms on those two days are
unlikely to be severe.

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

Mahale

In the hours before

Special weather statement, Mar 26, 2:03 PM CDT, 45 minutes before

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Local storm report, Mar 26, 2:04 PM CDT, 44 minutes before

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Special weather statement, Mar 26, 2:09 PM CDT, 39 minutes before

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Special weather statement, Mar 26, 2:25 PM CDT, 23 minutes before

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Special weather statement, Mar 26, 2:27 PM CDT, 21 minutes before

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Local storm report, Mar 26, 2:39 PM CDT, 9 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
Mar 25, 7:30 PM CDT	Special Weather Statement	OUN	Garvin	30 min
Mar 26, 5:42 AM CDT	Dense Fog Advisory	OUN	Alfalfa, Garfield, Grant, Harper, Kay, Major and 4 more	116 min
Mar 26, 11:30 AM CDT	Flood Watch	OUN	Atoka, Bryan, Carter, Cleveland, Coal, Cotton and 15 more	38 hr
Mar 26, 1:08 PM CDT	Special Weather Statement	OUN	Cotton	37 min
Mar 26, 1:58 PM CDT	Special Weather Statement	OUN	Cotton	32 min
Mar 26, 2:20 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	40 min
Mar 26, 3:01 PM CDT	Special Weather Statement	OUN	Cotton	29 min
Mar 26, 4:37 PM CDT	Special Weather Statement	OUN	Stephens	23 min
Mar 26, 11:55 AM CDT	Special Weather Statement	OUN	Clay	20 min
Mar 26, 12:14 PM CDT	Special Weather Statement	OUN	Clay	16 min
Mar 26, 12:45 PM CDT	Special Weather Statement	OUN	Clay	15 min
Mar 26, 12:53 PM CDT	Special Weather Statement	OUN	Clay	22 min
Mar 26, 12:57 PM CDT	Special Weather Statement	OUN	Baylor	18 min
Mar 26, 1:10 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	50 min
Mar 26, 1:16 PM CDT	Special Weather Statement	OUN	Wilbarger	29 min
Mar 26, 1:26 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	49 min
Mar 26, 1:47 PM CDT	Special Weather Statement	OUN	Wilbarger	28 min
Mar 26, 1:49 PM CDT	Special Weather Statement	OUN	Knox	26 min
Mar 26, 2:03 PM CDT	Special Weather Statement	OUN	Baylor	27 min
Mar 26, 2:09 PM CDT	Special Weather Statement	OUN	Wichita	21 min
Mar 26, 2:25 PM CDT	Special Weather Statement	OUN	Wichita	35 min
Mar 26, 2:27 PM CDT	Special Weather Statement	OUN	Baylor	33 min
Mar 26, 2:41 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor	49 min
Mar 26, 3:24 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Wichita	24 min
Mar 26, 3:56 PM CDT	Special Weather Statement	OUN	Archer	34 min
Mar 26, 4:22 PM CDT	Special Weather Statement	OUN	Baylor	23 min
Mar 26, 4:28 PM CDT	Areal Flood Advisory	OUN	Wichita	2 hr
Mar 26, 4:43 PM CDT	Special Weather Statement	OUN	Baylor	32 min
Mar 26, 5:16 PM CDT	Special Weather Statement	OUN	Archer	29 min
Mar 26, 5:45 PM CDT	Special Weather Statement	OUN	Archer	30 min
Mar 26, 6:33 PM CDT	Special Weather Statement	OUN	Clay	27 min
Mar 26, 6:38 PM CDT	Special Weather Statement	OUN	Archer	37 min
Mar 26, 6:54 PM CDT	Severe Thunderstorm Warning	OUN	Archer	36 min

Nearby

Severe Thunderstorm Warnings in Texas, 2018 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.