Severe Thunderstorm Warning 443, NWS Norman, OK

Area Forecast Discussion
National Weather Service Norman OK
314 PM CDT Mon May 22 2017

.DISCUSSION...
The main concerns are rain/storm chances/potential tonight
into Tuesday.

Ongoing isolated to numerous light showers across central and
northern Oklahoma as of 3 pm should weaken in the next several
hours as isentropic lift around 700 mb weakens. This activity
will remain rather light. Some thunder may occur with this
activity, but do not think any strong or severe storms will
occur due to limited instability (MUCAPE mainly below 600 J/kg).

Severe thunderstorm potential now through tonight still appears
to be low with decreasing confidence. Cloud cover and rain have
limited instability in most locations north of a Mangum to
Seminole line. South of this line, some sun and daytime heating
have allow temperatures to rise into 70s. A few thunderstorms may
form near and this cloud shield line in the next several hours,
though this remains doubtful due to sufficient capping. Higher
chances for severe storms appear to occur over far eastern New
Mexico into west Texas late this afternoon where the air is more
unstable. This activity will continue to move east and southeast,
which may glance western north Texas and far southwestern Oklahoma
this evening if they can organize into a complex or two. If
severe storms occur, some severe hail and wind reports, mainly on
the lower end of severe spectrum (hail less than golf ball size
and winds under 70 mph), would be possible. No severe storms are
expected north of the line mentioned above due to limited
instability.

After midnight tonight into Tuesday morning, a cold front will
move south and through the area. A few lingering weak showers and
thunderstorms may occur across the area.

Tuesday afternoon, some clearing can be expected, though
temperatures will remain on the cool side for late May. Sufficient
daytime heating may allow for isolated to scattered showers and
weak thunderstorms to form in rather chilly unstable airmass. If
storms occur, no severe storms would be expected due to limited
instability (less than 500 J/kg), however small hail up to nickels
and gusty winds up to 50 mph could result.

Tuesday night through Thursday, dry weather is expected. Thursday
will be warmer (possibly much warmer) than Wednesday.

Friday through Memorial Day, a warm/hot humid airmass may evolve
across the southern Plains Friday through early Sunday, along for
some potential for severe thunderstorms/heavy rainfall. Most
models have been consistently depicting rather high amounts of
potential instability (MUCAPE 2000-5000 J/kg), high low level
moisture (surface dewpoints in the 60s to lower 70s), and
sufficient shear (0-6 km bulk shear 30-50 kt) for severe storms
with heavy rain late Friday through early Sunday. Capping may be
strong and limit storm development. For now, kept low chances for
storms across the area Friday night into Sunday. Have low
confidence in severe storm and heavy rainfall potential during
this time frame. Slightly cooler and drier conditions may occur
with the passage of a weak cold front Sunday into Memorial Day.

MBS

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  55  70  48  73 /  40  20  10   0
Hobart OK         53  70  47  79 /  40  20   0   0
Wichita Falls TX  59  72  51  79 /  50  40   0   0
Gage OK           50  68  43  76 /  40  20  10   0
Ponca City OK     53  69  47  70 /  30  20  10   0
Durant OK         58  70  51  74 /  40  40  10   0

&&

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

25/17

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
304 PM CDT Mon May 22 2017

OKZ004>048-050>052-TXZ083>090-232015-
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-
304 PM CDT Mon May 22 2017

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

.DAY ONE...Rest of This Afternoon and Tonight...

.THUNDERSTORMS...
There is a slight risk of severe thunderstorms across portions of
western north Texas. There is a marginal risk of severe storms
over a broader area of western and southern Oklahoma and north
Texas.

LOCATION...
The slight risk area is along and southwest of a line from Crowell
to Archer City Texas. The marginal risk of severe storms is southwest
of a line from Cheyenne to Clinton to Ardmore Oklahoma.

TIMING...
4 PM to 9 PM

IMPACTS...
Winds to 70 mph and hail to the size of half dollars.

DISCUSSION...
Showers and thunderstorms will continue to develop and move east
into and across the area. In general, instability will be low and
the severe weather risk is low. However, there is a small chance
that instability could increase enough in western sections of
north Texas that isolated severe storms may occur.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...
Storm spotter groups and emergency management personnel across
western north Texas should monitor the forecasts and prepare for
the possibility of severe weather operations late this afternoon
or this evening.

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

.THUNDERSTORMS...
Scattered thunderstorms will persist through the day Tuesday
before ending across the area. No severe storms are expected.

There is a chance of storms again Friday night through Sunday. If
storms do occur during this timeframe, severe weather and heavy
rainfall are possible.

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
624 PM CDT MON MAY 22 2017

OKZ022-035-230000-
Kiowa OK-Washita OK-
624 PM CDT MON MAY 22 2017

...SIGNIFICANT WEATHER ADVISORY FOR north central Kiowa and
southwestern Washita Counties Until 700 PM CDT...

AT 620 PM CDT, a strong thunderstorm was located near Sentinel,
moving east at 35 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Minor flooding in areas of poor drainage...

LAT...LON 3521 9936 3526 9897 3522 9890 3512 9890
      3504 9898 3513 9936
TIME...MOT...LOC 2320Z 275DEG 30KT 3516 9921

MAD

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
657 PM CDT MON MAY 22 2017

OKZ033-034-230030-
Harmon OK-Greer OK-
657 PM CDT MON MAY 22 2017

...SIGNIFICANT WEATHER ADVISORY FOR northern Harmon and southwestern
Greer Counties Until 730 PM CDT...

AT 657 PM CDT, a strong thunderstorm was located 4 miles west of
Vinson, moving southeast at 30 MPH.

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

LAT...LON 3497 10000 3500 9999 3491 9953 3470 9976
      3486 10000
TIME...MOT...LOC 2357Z 304DEG 25KT 3492 9993

MAD

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
659 PM CDT MON MAY 22 2017

OKZ034-035-230030-
Kiowa OK-Greer OK-
659 PM CDT MON MAY 22 2017

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Kiowa and east
central Greer Counties Until 730 PM CDT...

AT 657 PM CDT, a strong thunderstorm was located near Lone Wolf,
moving east at 25 MPH.

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

LAT...LON 3503 9940 3501 9905 3490 9907 3483 9915
      3485 9915 3485 9917 3486 9919 3485 9919
      3484 9920 3484 9921 3492 9947
TIME...MOT...LOC 2357Z 288DEG 21KT 3497 9930

MAD

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
705 PM CDT MON MAY 22 2017

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

0700 PM     HAIL             1 ENE CLINTON           35.51N 98.96W
05/22/2017  E0.88 INCH       CUSTER             OK   TRAINED SPOTTER

&&

FM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
706 PM CDT MON MAY 22 2017

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

0703 PM     HAIL             1 ENE CLINTON           35.51N 98.96W
05/22/2017  E1.00 INCH       CUSTER             OK   STORM CHASER

&&

FM