Special Weather Statement, NWS Norman, OK

Area Forecast Discussion...UPDATED
National Weather Service Norman OK
720 PM CDT Fri May 18 2018

.UPDATE...
Thunderstorms that developed west of the fa late this
afternoon/early evening continue to move into western portions of
the fa. Have increased PoPs to cover this activity. Thunderstorms
expected to continue to move east across portions of the fa the
rest of this evening. Some strong to severe storms possible.

&&

.PREV DISCUSSION... /issued 704 PM CDT Fri May 18 2018/

DISCUSSION...

AVIATION...
Thunderstorms will move through northwestern then north central
and central Oklahoma this evening before dissipating overnight.
VFR conditions are expected to exist outside of thunderstorms.
Gusty south winds will persist Saturday with the approach of a
weak cold front to northwestern Oklahoma around 192400.

PREV DISCUSSION... /issued 351 PM CDT Fri May 18 2018/

DISCUSSION...
High-resolution models show a consistent signal of storm
development across the panhandles late this afternoon and this
evening which should move east/northeast into the area with the
highest chances across northwest Oklahoma associated with the
enhanced risk of severe storms. But even now we have had
early development east of Lubbock that may also affect our
southwestern areas. We will have the potential for severe storms
this evening with hail and wind potential with the initial
discrete development, evolving more into a wind event as the
storms develop into a line of complex through mid evening. Severe
weather potential will likely decrease later tonight. We can see
some lingering pops tomorrow morning, but then additional
potential of storm development along and ahead of the cold front
that will move through the area tomorrow night. There is severe
potential with these storms as well, especially as storms become
more widespread in the evening. The front will bring cooler
weather for early next week, but only a brief lull from storm
chances as the area will remain under a general southwest flow
aloft into next week with various shortwaves bringing storm
chances, although the specific timing is always a question mark.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  70  90  64  78 /  30  10  50  40
Hobart OK         69  92  63  77 /  60  20  50  50
Wichita Falls TX  70  92  67  82 /  20  10  50  50
Gage OK           63  86  54  74 /  80  20  50  20
Ponca City OK     70  93  62  78 /  40  20  50  20
Durant OK         70  90  69  85 /  20  10  20  20

&&

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

25/09

Hazardous Weather Outlook
National Weather Service Norman OK
1204 PM CDT Fri May 18 2018

OKZ004>048-050>052-TXZ083>090-191715-
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-
1204 PM CDT Fri May 18 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...
There is an Enhanced Risk of severe thunderstorms this afternoon
and tonight across northwest Oklahoma. There is a Slight Risk of
severe thunderstorms across a broader area of western and
northern Oklahoma. There is a Marginal Risk of severe
thunderstorms from western sections of north Texas through central
and north central Oklahoma.

.Location...
The Enhanced Risk area is northwest of a line from Alva to
Woodward to Gage. The Slight Risk area is southeast of the
Enhanced Risk area, and northwest of a line from Medford to Enid
to Altus. The Marginal Risk area is southeast of the Slight Risk
area and northwest of a line from Stillwater to Purcell to Waurika
Oklahoma to Henrietta and Archer City Texas.

.Timing...
Most likely time for severe storms will be from 6 pm through
midnight.

.Impacts...
Damaging wind gusts up to 70 mph and hail to the size of golf balls
will be the main hazards. However an isolated tornado will be
possible, especially across the Enhanced Risk and Slight Risk
areas.

.Discussion...
Scattered strong to severe thunderstorms are expected to develop
late this afternoon near a dryline across the central Oklahoma
and Texas panhandles. These storms are expected to develop into
clusters or lines of storms as they move east and northeast
toward western Oklahoma and perhaps western north Texas during
the early evening hours and will be capable of producing damaging
wind gusts and hail to the size of golf balls. A strengthening
low level jet will aid in creating a more favorable environment
for an isolated tornado or two with any thunderstorm that can
remain discrete into the evening hours across western Oklahoma and
western north Texas. Storms are expected to weaken by the late
evening hours into the overnight as they approach central sections
of Oklahoma.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday...

.Thunderstorms...
Strong to severe thunderstorms will be possible across parts
western, northern and central Oklahoma and western north Texas
late Saturday afternoon and night along and ahead of a dryline and
a cold front.

Thunderstorm chances will continue Sunday through Thursday across
parts of Oklahoma and north Texas. A few storms Sunday through
Thursday may be strong to severe.

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

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

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
600 PM CDT FRI MAY 18 2018

TXZ083-084-182330-
Foard TX-Hardeman TX-
600 PM CDT FRI MAY 18 2018

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Foard and
southwestern Hardeman Counties Until 630 PM CDT...

AT 557 PM CDT, a strong thunderstorm was located 11 miles southeast
of Swearingen, moving northeast at 30 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...

LAT...LON 3414 10005 3438 9989 3422 9963 3393 9995
      3399 10005
TIME...MOT...LOC 2257Z 215DEG 27KT 3404 9999

..speg.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
627 PM CDT FRI MAY 18 2018

OKZ004-190000-
Harper OK-
627 PM CDT FRI MAY 18 2018

...SIGNIFICANT WEATHER ADVISORY FOR western Harper County Until 700
PM CDT...

AT 626 PM CDT, a strong thunderstorm was located 6 miles northeast of
Slapout, moving northeast at 30 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...

LAT...LON 3685 9965 3659 9996 3660 10000 3688 10001
      3700 9992 3700 9990
TIME...MOT...LOC 2326Z 217DEG 26KT 3669 10003

..speg.

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
802 PM CDT FRI MAY 18 2018

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

0755 PM     TSTM WND GST     6 S BUFFALO             36.75N 99.63W
05/18/2018  E60 MPH          HARPER             OK   BROADCAST MEDIA

&&

MAD

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
816 PM CDT FRI MAY 18 2018

OKZ021-033-034-190145-
Harmon OK-Beckham OK-Greer OK-
816 PM CDT FRI MAY 18 2018

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Harmon...
southwestern Beckham and northwestern Greer Counties Until 845 PM
CDT...

AT 813 PM CDT, a strong thunderstorm was located 8 miles southeast of
Lutie, moving northeast at 45 MPH.

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

Locations impacted include...
Erick, Texola, Vinson and Madge.

This includes Interstate 40 between mile markers 2 and 15.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the situation closely. Be ready to act quickly if a warning
is issued or if storms threaten you.

&&

LAT...LON 3522 10000 3531 9975 3500 9964 3479 10000
TIME...MOT...LOC 0113Z 239DEG 40KT 3495 10010

WR

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
849 PM CDT FRI MAY 18 2018

OKZ014-016-021-022-190230-
Washita OK-Roger Mills OK-Beckham OK-Custer OK-
849 PM CDT FRI MAY 18 2018

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Washita...southern
Roger Mills...Beckham and southwestern Custer Counties Until 930 PM
CDT...

AT 846 PM CDT, a strong thunderstorm was located near Vinson;
however, very gusty south winds were occuring well north of Greer
County.

HAZARDS INCLUDE...
Wind gusts over 50 MPH...

Locations impacted include...
Elk City, Sayre, Cheyenne, Erick, Hammon, Reydon, Sweetwater, Strong
City, Texola, Berlin and Dempsey.

This includes Interstate 40 between mile markers 1 and 44.

LAT...LON 3506 9999 3573 10000 3569 9934 3533 9930
TIME...MOT...LOC 0146Z 244DEG 30KT 3529 9965

WR