Area Forecast Discussion
Issued by NWS Wilmington, OH

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FXUS61 KILN 301457

Area Forecast Discussion
National Weather Service Wilmington OH
1057 AM EDT Sun Apr 30 2017

Southerly flow will result in warm and humid conditions today.
A cold front will push through tonight through Monday morning,
bringing showers and thunderstorms. Cooler and drier air will
settle in behind the front for Tuesday.


Warn front has lifted north of the forecast area. MCS remnants
in Indiana and points west has sent quite a bit of cloud cover
into western counties. Meanwhile some showers have developed in
central Kentucky near the edge of the thicker clouds, perhaps a
differential heating boundary despite being relatively early in
the day. This activity is moving north northeast into the
southern part of the forecast area. Expect to continue to see
the possibility of isolated to scattered activity into the
afternoon with little focus due to weak forcing. Forecast highs
still look reachable although if clouds do not thin in the west,
forecast may be a bit high.


Most locations should be dry this evening, except in western
counties where scattered convection may linger. Conditions will
change during the overnight hours as the cold front closes in
from the west. A band of showers and thunderstorms will develop
along the front and move across the area late tonight through
Monday morning. Potent winds aloft will aid in thunderstorm
organization, which may allow stronger updrafts to produce
isolated damaging wind gusts and large hail. Severe potential
may be limited by marginal instability during the overnight to
early morning hours. Heavy rain will accompany the
thunderstorms, leading to localized flooding, especially over
saturated soils in areas that have already received heavy
rainfall in recent days. Showers and thunderstorms will diminish
quickly by Monday afternoon as the front travels east.

A tight pressure gradient and vigorous mixing behind the cold
front will result in wind gusts close to 40 mph Monday

Temperatures will be cooled by clouds, precip and advection
associated with the cold front. Highs are forecast to range from
the lower 60s far west up to the lower 70s far east.


Deep upper level low to track east-northeast across the Great Lakes
into southern Canada Monday night into Tuesday. Best moisture and
lift to our north closer to the upper low. Will limit pops to a
slight chance of a shower far north Monday night into Tuesday. In
tight pressure gradient winds to gust up to 40 mph Tuesday.
Temperatures will be cooler with highs Tuesday from near 60
northwest to 70 southeast.

Confluent westerly mid level flow with surface high pressure
building into the Great Lakes Tuesday night into Wednesday. At the
same time a mid level trof develops over the central plains. The
flow backs across the Ohio Valley with moisture spreading back in
from the south Wednesday. Temperatures look to be around 5 degrees
below normal with highs Wednesday ranging from near 60 northwest to
the upper 60s southeast.

Surface wave to track north into the Ohio Valley as upper level low
closes off. This will enhance rain shower chances Thursday. Clouds
and rain will keep temperatures around 10 degrees below normal with
highs Thursday ranging from the mid/upper 50s northwest to the lower
60s southeast.

Model solutions have differed on handling the system at the end of
the week into next weekend. Previous runs have oscillated regarding
the phasing of the streams. Latest trend on GFS and ECMWF phases the
flow with upper level low tracking through the Ohio Valley Friday.
Due to the large changes with each run confidence in fcst is low for
the end of the week into next weekend. Have trended wetter on Friday
and keep a slight chance of a rain shower Saturday.

Will continue cool temperatures with highs Friday in the upper 50s
and lower 60s and generally in the middle 60s on Saturday.


Conditions will be VFR through the day. South winds will gust
over 20 knots.

Later in the TAF period, a strong cold front approaching from
the west will produce showers and thunderstorms. MVFR
conditions and 20+ knot wind gusts are expected during this
time, and wind shear is also forecast.

OUTLOOK...MVFR ceilings are possible Monday. Wind gusts to 35
kt possible Monday into Tuesday. MVFR ceilings and visibilities
possible again on Thursday.




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