Special Weather Statement, NWS Norman, OK

Area Forecast Discussion
National Weather Service Norman OK
228 AM CDT Wed Aug 8 2018

.DISCUSSION...
The primary forecast issue is the chance of showers/storms the
next 36 hours with the potential of localized flooding this
morning.

A shortwave trough is approaching from the west this morning.
Ahead of the wave, a strengthening low-level jet and attendant
isentropic ascent has resulted in showers/storms developing along
a northwest to southeast corridor from northwest Oklahoma to
central Oklahoma.

Training thunderstorms along this line may result in localized
flooding--especially in any urban areas. Therefore, a Flood Watch
was issued for this morning. Some flooding will be a concern for
this morning's commute.

Showers/storms are expected to gradually move south-southeastward
through the morning and early afternoon hours. After this complex
of thunderstorms passes by, most locations will likely experience
a break in precipitation.

For tonight, another shortwave trough is expected to approach
from the north with additional showers/storms developing within a
corridor of isentropic ascent ahead of the wave.

There still remains some uncertainty where the greatest chance of
showers/storms will be located tonight. Currently, the greatest
ascent appears to be on the nose of a low-level jet across
southwest Oklahoma and adjacent parts of north Texas (farther
south than this morning). This area seems to be preferred by many
convective-allowing models as well.

For Thursday afternoon and Friday, most locations should be dry;
however, showers/storms will be possible near the Red River and
north Texas. Some showers/storms could even impact western
Oklahoma by Friday.

Toward the weekend into early next week, an unsettled pattern is
still expected across the Southern Plains. Both the ECMWF and GFS
continue to indicate the presence of a closed upper-level low with
high moisture/precipitable water values. The 08/00Z GFS has
widespread 1.5 to 2.0+" precipitable water values by Sunday.

Consequently, there a daily chance of showers/storms with cooler
than average temperatures. Heavy rainfall/flooding may be an issue
in this period as well.

Mahale

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  84  70  89  69 /  80  40  10  10
Hobart OK         90  70  90  70 /  40  50  20  10
Wichita Falls TX  98  72  92  72 /  40  70  30  30
Gage OK           88  67  90  67 /  30  30  10  10
Ponca City OK     87  68  92  69 /  30  20  10  10
Durant OK         93  72  88  71 /  70  70  40  30

&&

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

03/10

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
354 AM CDT WED AUG 8 2018

OKZ011-012-015-017-018-080945-
Major OK-Garfield OK-Kingfisher OK-Dewey OK-Blaine OK-
354 AM CDT WED AUG 8 2018

...SIGNIFICANT WEATHER ADVISORY FOR Major...southwestern Garfield...
northern Kingfisher...northeastern Dewey and northern Blaine Counties
Until 445 AM CDT....

AT 350 AM CDT, strong thunderstorms were along a line extending from
near Drummond to 5 miles northeast of Chester, moving southeast at 40
MPH.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3597 9768 3601 9864 3635 9896 3648 9802
TIME...MOT...LOC 0850Z 311DEG 33KT 3629 9802 3627 9886

03

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
356 AM CDT WED AUG 8 2018

OKZ004>006-010-011-080945-
Major OK-Woodward OK-Alfalfa OK-Harper OK-Woods OK-
356 AM CDT WED AUG 8 2018

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Major...northeastern
Woodward...southwestern Alfalfa...southeastern Harper and southern
Woods Counties Until 445 AM CDT....

AT 354 AM CDT, strong thunderstorms were along a line extending from
4 miles west of Dacoma to 4 miles north of Mooreland to 6 miles
northeast of Fort Supply, moving southeast at 20 MPH.

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

Locations impacted include...
Mooreland, Waynoka, Carmen, Cleo Springs, Freedom, Aline, Dacoma,
Alabaster Caverns State Park, Quinlan, Avard, Hopeton, Bouse Junction
and Camp Houston.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Severe weather is not expected and no warnings are anticipated at
this time.

&&

LAT...LON 3640 9836 3626 9882 3632 9925 3659 9950
      3685 9938 3675 9855
TIME...MOT...LOC 0854Z 305DEG 18KT 3664 9864 3651 9920 3664 9949

03

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
421 AM CDT WED AUG 8 2018

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

0420 AM     FLASH FLOOD      2 SW PIEDMONT           35.62N 97.77W
08/08/2018                   CANADIAN           OK   LAW ENFORCEMENT

            150TH STREET NEAR PIEDMONT REPORTED IMPASSIBLE.

&&

VMAHALE

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