Alert archive / Texas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 438, NWS Norman, OK

July 1, 2018Clay County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Jul 1, 2018, 1:57 PM CDT for Clay County, Texas. It was in force for 18 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: Jul 1, 2018, 1:57 PM CDT (18:57 UTC)
Expired: Jul 1, 2018, 2:15 PM CDT
In force: 18 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Clay County, TX

The radar

The Altus AFB radar (KFDR), 95 km from the middle of the area, began a volume at 19:02 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

Fort Worth, TX (KFWD), launched 12:00Z, 7.0 hours before the alert went out and 136 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: 802 J/kg
Mixed-layer CIN: -272 J/kg
Mixed-layer LCL: 1080 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 1, 1:19 PM CDT, 38 minutes earlier.

Area forecast discussion, Jul 1, 1:19 PM CDT, 38 minutes before

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Hazardous weather outlook, Jul 1, 11:44 AM CDT, 2 hours 13 minutes before

Hazardous Weather Outlook
National Weather Service Norman OK
1144 AM CDT Sun Jul 1 2018

OKZ004>048-050>052-TXZ083>090-021115-
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-
1144 AM CDT Sun Jul 1 2018

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

.DAY ONE...This Afternoon and Tonight...

.Thunderstorms...
Thunderstorms will be possible this afternoon and tonight across
portions of the area. A few strong to severe thunderstorms will be
possible this afternoon across southern Oklahoma and western
north Texas. The primary hazard with any severe storms will be
damaging wind gusts. Further, any thunderstorm could produce very
heavy rainfall resulting in some flooding.

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

.Thunderstorms...
A few thunderstorms are possible in northwest Oklahoma Monday
evening. Thunderstorms could occur across southern Oklahoma
Wednesday and Wednesday night. Thunderstorms are possible across
most of the area Friday and Saturday. Severe thunderstorms are
unlikely during this period.

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, Jul 1, 10:11 AM CDT, 3 hours 46 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1011 AM CDT SUN JUL 1 2018

OKZ019-020-011545-
Payne OK-Logan OK-
1011 AM CDT SUN JUL 1 2018

...SIGNIFICANT WEATHER ADVISORY FOR southwestern Payne and
northeastern Logan Counties Until 1045 AM CDT....

AT 1006 AM CDT, a strong thunderstorm was located 5 miles northwest
of Langston, moving northeast at 20 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Minor flooding in areas of poor drainage...

Locations impacted include...
Perkins, Langston, Coyle and Lake Carl Blackwell.

This includes Interstate 35 between mile markers 165 and 172.

LAT...LON 3589 9731 3605 9741 3615 9720 3612 9717
      3599 9703
TIME...MOT...LOC 1506Z 239DEG 16KT 3600 9732

WR

Special weather statement, Jul 1, 12:43 PM CDT, 1 hour 14 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1243 PM CDT SUN JUL 1 2018

TXZ089-090-011815-
Clay TX-Archer TX-
1243 PM CDT SUN JUL 1 2018

...SIGNIFICANT WEATHER ADVISORY FOR west central Clay and
northeastern Archer Counties Until 115 PM CDT....

AT 1241 PM CDT, a strong thunderstorm was located near Archer City,
moving northeast at 25 MPH.

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

Locations impacted include...
Archer City, Scotland and Lake Arrowhead.

LAT...LON 3355 9862 3363 9873 3382 9849 3367 9829
TIME...MOT...LOC 1741Z 233DEG 22KT 3362 9863

WR

Special weather statement, Jul 1, 1:37 PM CDT, 20 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
137 PM CDT SUN JUL 1 2018

TXZ089-090-011915-
Clay TX-Archer TX-
137 PM CDT SUN JUL 1 2018

...SIGNIFICANT WEATHER ADVISORY FOR southern Clay and northeastern
Archer Counties Until 215 PM CDT....

AT 135 PM CDT, strong thunderstorms were along a line extending from
5 miles north of Scotland to 7 miles southwest of Bellevue, moving
east at 25 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...

Locations impacted include...
Henrietta, Scotland, Bellevue, Jolly, Lake Arrowhead, Bluegrove, Joy
and Vashti.

LAT...LON 3375 9864 3384 9845 3384 9842 3385 9842
      3391 9829 3379 9798 3353 9798 3350 9816
TIME...MOT...LOC 1835Z 258DEG 21KT 3373 9850 3356 9811

WR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 7:22 AM CDT	Special Weather Statement	OUN	Oklahoma	23 min
Jul 1, 7:30 AM CDT	Special Weather Statement	OUN	Oklahoma	30 min
Jul 1, 9:22 AM CDT	Areal Flood Advisory	OUN	Payne	113 min
Jul 1, 10:02 AM CDT	Areal Flood Advisory	OUN	Logan	3 hr
Jul 1, 10:11 AM CDT	Special Weather Statement	OUN	Payne	34 min
Jul 1, 2:47 PM CDT	Special Weather Statement	OUN	Cotton	28 min
Jul 1, 3:11 PM CDT	Special Weather Statement	OUN	Love	34 min
Jul 1, 3:39 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Love	66 min
Jul 1, 3:45 PM CDT	Special Weather Statement	OUN	Stephens	30 min
Jul 1, 3:51 PM CDT	Special Weather Statement	OUN	Love	24 min
Jul 1, 4:08 PM CDT	Severe Thunderstorm Warning	OUN	Love	52 min
Jul 1, 4:42 PM CDT	Severe Thunderstorm Warning	OUN	Bryan, Carter, Johnston, Love, Marshall	57 min
Jul 1, 5:20 PM CDT	Special Weather Statement	OUN	Bryan	25 min
Jul 1, 5:41 PM CDT	Special Weather Statement	OUN	Bryan	34 min
Jul 1, 12:43 PM CDT	Special Weather Statement	OUN	Archer	32 min
Jul 1, 1:37 PM CDT	Special Weather Statement	OUN	Clay	38 min
Jul 1, 2:20 PM CDT	Special Weather Statement	OUN	Clay	25 min

Nearby

Severe Thunderstorm Warnings in Texas, 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.