Severe Thunderstorm Warning 213, NWS Omaha, NE

Area Forecast Discussion
National Weather Service Omaha/Valley NE
633 PM CDT TUE AUG 16 2016

.SHORT TERM...(tonight through Friday)
Issued at 345 PM CDT Tue Aug 16 2016

Forecast concerns tonight will be precipitation coverage/chance
of thunderstorms.

Latest radar/satellite imagery highlight a couple of areas of
showers and thunderstorms. The area over the Omaha/Council Bluffs
area has lingered through the afternoon hours and is in a fairly
narrow area. Steep lapse rates remain in place with 13-16 deg
dewpoints pooled in this area. mid level warm air advection
persists this evening as they push eastward ahead of the mid level
shortwave. The low level jet increases this evening across
northeast Kansas and this could help promote thunderstorm
activity. Recent experiment HRRR/SPC HRRR linger storms in
southeast Nebraska and southwest Iowa.  Will maintain isolated to
scattered pops for this area.

Other areas of concern are over parts of Minnesota. These storms
are tracking south toward an area of favorable CAPE and along the
instability axis. A 0-3km wind max is associated with the stronger
cluster and tends to stay north of the area. SPC has broadened
it's slight risk and the marginal risk remains in the area where
we have storms mentioned. The experimental HRRR/SPC HRRR/RAP do hint
at the potential for storms in northeast Nebraska into Iowa...so
do mention pops here.

The pesky trough shifts to the east Wednesday with mid level
ridging, thus have a mainly dry forecast and high temperatures in
the 80s to around 90. There is a slight chance for thunderstorms
in northeast Nebraska late Wednesday night.

The next best chance for thunderstorms will be Friday. The models
have slowed the front down, however we do have likely rain chances
for Friday afternoon for parts of the area.

.LONG TERM...(Friday night through Tuesday)
Issued at 345 PM CDT Tue Aug 16 2016

Thunderstorms continue Friday night as the leading portion of the
h5 trough moves in. Trailing energy may linger the storm chances
into Saturday, however there is good north flow behind the front.
Much cooler for the weekend with highs in the 70s.

&&

.AVIATION...(For the 00Z TAFS through 00Z Wednesday evening)
Issued at 631 PM CDT Tue Aug 16 2016

VFR conditions are expected through the TAF period. Scattered
thunderstorms are possible at the sites and did include a VCTS for
KLNK AND KOMA for the evening.

&&

.OAX Watches/Warnings/Advisories...
NE...None.
IA...None.
&&

SHORT TERM...Zapotocny
LONG TERM...Zapotocny
AVIATION...Kern

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
535 PM CDT TUE AUG 16 2016

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-171245-
MONONA-HARRISON-SHELBY-POTTAWATTAMIE-MILLS-MONTGOMERY-FREMONT-
PAGE-KNOX-CEDAR-THURSTON-ANTELOPE-PIERCE-WAYNE-BOONE-MADISON-
STANTON-CUMING-BURT-PLATTE-COLFAX-DODGE-WASHINGTON-BUTLER-
SAUNDERS-DOUGLAS-SARPY-SEWARD-LANCASTER-CASS-OTOE-SALINE-
JEFFERSON-GAGE-JOHNSON-NEMAHA-PAWNEE-RICHARDSON-
535 PM CDT TUE AUG 16 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST
IOWA...WEST CENTRAL IOWA...EAST CENTRAL NEBRASKA...NORTHEAST
NEBRASKA AND SOUTHEAST NEBRASKA.

.DAY ONE...TONIGHT AND WEDNESDAY

ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE DURING THE EVENING IN
NORTHEAST NEBRASKA WITH LARGE HAIL THE PRIMARY THREAT. OTHER
STRONG THUNDERSTORMS ARE POSSIBLE GENERALLY ALONG AND SOUTH OF
INTERSTATE 80. HOWEVER SEVERE STORMS ARE NOT LIKELY WITH THIS
ACTIVITY.

THEN AFTER MIDNIGHT...A FEW THUNDERSTORMS ARE STILL POSSIBLE IN
SOUTHEAST NEBRASKA AND SOUTHWEST IOWA AS A WEAK SURFACE BOUNDARY
SLIPS SOUTHEAST. THIS ACTIVITY SHOULD NOT BE SEVERE.

.DAYS TWO THROUGH SEVEN...WEDNESDAY NIGHT THROUGH TUESDAY

THERE WILL BE A BETTER CHANCE FOR THUNDERSTORMS FROM LATE
THURSDAY NIGHT INTO FRIDAY NIGHT AS A COLD FRONT MOVES THROUGH
THE REGION. A FEW SEVERE STORMS MAY OCCUR DURING THIS TIME. THERE
IS ALSO A CHANCE FOR THUNDERSTORMS EARLY NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TONIGHT OR WEDNESDAY.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
706 PM CDT TUE AUG 16 2016

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

0625 PM     HAIL             8 N CROFTON             42.85N 97.50W
08/16/2016  E2.00 INCH       KNOX               NE   PUBLIC

&&

BKERN

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
725 PM CDT TUE AUG 16 2016

NEZ066>068-170115-
CASS NE-LANCASTER NE-OTOE NE-
725 PM CDT TUE AUG 16 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN CASS...NORTHWESTERN
OTOE AND EAST CENTRAL LANCASTER COUNTIES UNTIL 815 PM CDT...

AT 725 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 7
MILES SOUTH OF WAVERLY...OR 9 MILES EAST OF LINCOLN...MOVING
SOUTHEAST AT 10 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
PALMYRA AND EAGLE.

THIS INCLUDES HIGHWAY 2 IN NEBRASKA BETWEEN MILE MARKERS 472 AND 478.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4077 9660 4087 9660 4090 9650 4078 9627
      4064 9637
TIME...MOT...LOC 0025Z 304DEG 9KT 4081 9650

DERGAN

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