Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 439, NWS Norman, OK

July 1, 2018Carter County, Love County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 1, 2018, 3:39 PM CDT for Carter County, Love County, Oklahoma. It was in force for 66 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, 3:39 PM CDT (20:39 UTC)
Expired: Jul 1, 2018, 4:45 PM CDT
In force: 66 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Carter County, OK, Love County, OK

The radar

The Norman radar (KTLX), 137 km from the middle of the area, began a volume at 20:41 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, 8.7 hours before the alert went out and 141 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, 2:48 PM CDT, 51 minutes earlier.

Area forecast discussion, Jul 1, 2:48 PM CDT, 51 minutes before

Area Forecast Discussion
National Weather Service Norman OK
248 PM CDT Sun Jul 1 2018

.DISCUSSION...
No changes to 1:19 PM AFD...

On average, early afternoon temperatures (1 pm) are 5 to
15 degrees cooler than yesterday at this time.  This is mainly
a result of morning convection and extensive cloud cover.
Much of the morning precipitation over central and north central
Oklahoma has either weakened or developed to the east and south.

For this afternoon and evening, three features should aid in
thunderstorm development. First, there is an outflow boundary
that is aiding in current storm development across south central
Oklahoma. Second, a MCV that is drifting slowly northeast near our
Texas counties. Lastly, a weak cold front draped across west
central/northwest Oklahoma. Based on current radar trends and
other factors, southern Oklahoma and western north Texas will have
the best opportunity for showers and storms through the early to
mid evening. Unlike yesterday, do not expect an organized area to
develop and move/propagate over a large area. The stronger storms
will certainly produce very heavy rain along with a risk of
strong to perhaps damaging winds.

Later this evening and overnight, it's possible that more storms may
form across northern Oklahoma, as low level winds back and
increase. Models also show storm development across southwest
Texas that may reach our western north Texas counties late
tonight.

It still appears that most of Monday and Tuesday will be dry with
a return of much warmer/hotter temperatures.  The center of a mid
level ridge, currently over the mid Atlantic and Northeast U.S.,
will build to the west during the mid to later part of this week.
Meanwhile, an easterly wave may increase chances of showers
across mainly southern Oklahoma and north Texas on Wednesday.
Perhaps by next weekend, the ridge will build far enough west,
that evening storms to our west and north may enter northern
Oklahoma during the overnight/early morning.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  74  94  74  97 /  30  10  10   0
Hobart OK         74  98  75 101 /  30  10  10   0
Wichita Falls TX  75 101  76 104 /  40  10  10   0
Gage OK           71  95  72  98 /  20  10  20   0
Ponca City OK     74  93  74  95 /  20  10  10   0
Durant OK         76  99  75  97 /  20  10  10   0

&&

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

Hazardous weather outlook, Jul 1, 11:44 AM CDT, 3 hours 55 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, 5 hours 28 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, 2 hours 56 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, 2 hours 2 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

Special weather statement, Jul 1, 2:20 PM CDT, 1 hour 19 minutes before

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

OKZ045-TXZ090-011945-
Jefferson OK-Clay TX-
220 PM CDT SUN JUL 1 2018

...SIGNIFICANT WEATHER ADVISORY FOR south central Jefferson and east
central Clay Counties Until 245 PM CDT....

AT 218 PM CDT, a strong thunderstorm was located 7 miles northwest of
Stoneburg, moving northeast at 25 MPH.

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

Locations impacted include...
Terral and Bellevue.

LAT...LON 3363 9801 3387 9814 3396 9787 3389 9780
      3388 9780 3388 9782 3386 9783 3385 9787
      3388 9794 3388 9796 3389 9798 3364 9798
TIME...MOT...LOC 1918Z 234DEG 23KT 3375 9800

WR

Special weather statement, Jul 1, 2:47 PM CDT, 52 minutes before

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

OKZ039-044-045-012015-
Cotton OK-Stephens OK-Jefferson OK-
247 PM CDT SUN JUL 1 2018

...SIGNIFICANT WEATHER ADVISORY FOR southeastern Cotton...
southwestern Stephens and northwestern Jefferson Counties Until 315
PM CDT....

AT 244 PM CDT, a strong thunderstorm was located 5 miles west of
Hastings, moving northeast at 20 MPH.

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

LAT...LON 3412 9821 3424 9829 3434 9803 3422 9791
      3414 9810 3415 9811 3415 9813 3411 9817
      3411 9819
TIME...MOT...LOC 1944Z 240DEG 20KT 3420 9819

WR

Special weather statement, Jul 1, 3:11 PM CDT, 28 minutes before

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

OKZ045-046-050-012045-
Love OK-Carter OK-Jefferson OK-
311 PM CDT SUN JUL 1 2018

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Love...southwestern
Carter and east central Jefferson Counties Until 345 PM CDT....

AT 307 PM CDT, strong thunderstorms were along a line extending from
near Grady to 4 miles northwest of St. Jo, moving northeast at 15
MPH.

HAZARDS INCLUDE...
Wind gusts to 50 MPH...
Minor flooding in areas of poor drainage...

Locations impacted include...
Healdton, Wilson, Ringling, Leon, Grady, Rubottom, Burneyville,
Cornish, Courtney and Petersburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3384 9746 3389 9745 3391 9747 3392 9750
      3390 9755 3390 9759 3392 9760 3395 9759
      3397 9761 3399 9767 3397 9770 3405 9773
      3433 9751 3386 9726 3387 9728 3389 9731
      3385 9733 3388 9733 3382 9738 3382 9743
TIME...MOT...LOC 2007Z 208DEG 13KT 3404 9768 3375 9757

11

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, 3:45 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, 1:57 PM CDT	Severe Thunderstorm Warning	OUN	Clay	18 min
Jul 1, 2:20 PM CDT	Special Weather Statement	OUN	Clay	25 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.