Special Weather Statement, NWS Norman, OK

Area Forecast Discussion
National Weather Service Norman OK
911 PM CDT Sat Aug 5 2017

.DISCUSSION...
Storms continue to advance east/southeast across north-central to
west-central Oklahoma late this evening. Short-range CAMs suggest
that this group of storms will continue its southeast advance
overnight, feeding off a low-level jet and supported by a
mid/upper-level wave passing over Oklahoma. Storm intensity should
diminish late tonight, but storms are not expected to dissipate
until sometime Sunday morning.

Heavy rain is expected from the storms, especially through about
3 am. Some flooding may occur, especially in areas where storms
line up in the same direction as their movement.

We updated the forecast around 8 pm, and will continue to make
adjustments if trends change from expectations, or if we can
refine the details better.

CmS
&&

.PREV DISCUSSION... /issued 639 PM CDT Sat Aug 5 2017/

DISCUSSION...
Please see the 00Z aviation discussion below.

AVIATION...
Widespread thunderstorm activity is expected through the overnight
hours, especially from I40 northward. Hail up to the size of golf
balls and damaging wind gusts over 70 mph will be possible under
the strongest storms. By 06-07Z most of the storms will be located
across northern and west central OK.

PREV DISCUSSION... /issued 239 PM CDT Sat Aug 5 2017/

DISCUSSION...
Concerns continue to be with severe potential tonight as well as
heavy rainfall across parts of the area through Monday and perhaps
late this upcoming week as well.

Expect isolated storms to be possible as early as 3-4pm this
afternoon across parts of southwestern OK into western north TX
with more widespread activity developing later this evening across
northwest/northern Oklahoma. Surface boundary and convergence
along this boundary from southwest Kansas into the panhandle
region will be the focus for convective initiation as upper
shortwave makes its way east/southeast into the region.
Instability and deep layer wind shear will be sufficient for a few
severe storms with both a hail and wind threat.

As we move through the evening these storms are expected to
develop into a line or complex of storms that will continue to
pose a wind threat as they move east and southeast across the area
overnight. Heavy rain potential exists as well, but expected to
remain rather isolated in nature as storms remain progressive.

Main synoptic boundary is expected to drop south to near the I-44
corridor Sunday afternoon and again will be focus for additional
rain/thunderstorm development. Some strong storms will be
possible, mainly across southern half of Oklahoma south into north
Texas. Heavy rain will also continue to be a concern.

Best rain chances remain across southern Oklahoma into north Texas
through the first part of the upcoming week before several
additional disturbances drop southeast across the southern Plains
during the second half of the week into next weekend. This will
keep rain chances in the forecast for much of the area, along with
cooler temperatures.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  73  92  70  81 /  70  30  50  40
Hobart OK         75  94  70  82 /  60  30  50  50
Wichita Falls TX  77  99  71  86 /  30  50  70  60
Gage OK           67  85  64  82 /  60  10  20  20
Ponca City OK     70  87  67  81 /  70  30  20  10
Durant OK         76  94  73  86 /  30  60  70  70

&&

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

23/03

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
856 PM CDT SAT AUG 5 2017

OKZ014-060245-
Roger Mills OK-
856 PM CDT SAT AUG 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR southern Roger Mills County Until
945 PM CDT...

AT 855 PM CDT, a strong thunderstorm was located 6 miles southeast of
Cheyenne, moving east at 20 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Reduced visibility due to heavy rainfall...
Frequent cloud to ground lightning...

Locations impacted include...
Cheyenne, Hammon, Reydon, Strong City and Dempsey.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3571 9998 3581 9938 3572 9937 3555 9938
      3555 9936 3551 9937 3551 9958 3550 9958
      3549 9996
TIME...MOT...LOC 0155Z 258DEG 18KT 3553 9963

03

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
911 PM CDT SAT AUG 5 2017

OKZ015-016-060300-
Dewey OK-Custer OK-
911 PM CDT SAT AUG 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR Dewey and Custer Counties Until
1000 PM CDT...

AT 910 PM CDT, a strong thunderstorm was located 9 miles southwest of
Putnam, moving east at 40 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts over 50 MPH...
Reduced visibility due to heavy rainfall...
Frequent cloud to ground lightning...

Locations impacted include...
Taloga, Thomas, Arapaho, Leedey, Custer City, Butler, Camargo,
Oakwood, Putnam, Foss Reservoir, Moorewood, Fay and Hucmac.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3601 9938 3608 9864 3557 9863 3555 9937
TIME...MOT...LOC 0210Z 270DEG 33KT 3576 9908

03

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
953 PM CDT SAT AUG 5 2017

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

0600 PM     TSTM WND DMG     3 W WOODWARD            36.44N 99.45W
08/05/2017                   WOODWARD           OK   BROADCAST MEDIA

            SEVERAL UTILITY POLES SNAPPED ON HWY 412.
            RELAYED BY KOKH FOX 23. TIME WAS ESTIMATED.

&&

JP

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