Area Forecast Discussion
Issued by NWS Wilmington, OH-- Remove Highlighting --
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FXUS61 KILN 220242
Area Forecast Discussion
National Weather Service Wilmington OH
942 PM EST Tue Feb 21 2017
Showers will be possible through tonight along a weak cold
front. Dry weather will be found on Wednesday as return flow
sets up ahead of the next system. A warm front will lift north
through the Ohio Valley Thursday night, and then some
thunderstorms may develop with the passage of a cold front
.NEAR TERM /THROUGH WEDNESDAY/...
An area of upper level diffluence in between a weak northern
stream system and a stronger southern stream system has been
contributing to widespread pcpn this evening across much of our
area. This is being aided by a weak 20-25 knot low level jet
nosing up into the mid Ohio Valley. All of this is forecast to
slowly weaken as it shifts off to the southeast through the
overnight hours. Will therefore continue with categorical pops
across about the southern two thirds of our area through this
evening and then gradually taper off pcpn from the northwest
overnight. The cloud cover should help keep temps from dropping
off too much with overnight lows mainly in the lower 50s.
.SHORT TERM /WEDNESDAY NIGHT/...
What is left of any frontal convergence will be found across
eastern sections as Wednesday begins. This will keep a 20 to 30
percent chance of showers in the forecast for the east. As the
day progresses the chance should dissipate. Abundant low level
moisture will keep the skies cloudy for the morning, but some
mixing by afternoon should bring some peaks at the sun. With H8
temperatures around 8C, highs should be able to reach the mid
The region will be warm sectored Wednesday night, but the
models are showing quite a bit of cloud cover. In addition,
several models are bringing a vort max thru the zonal flow. This
is providing lift and causing some scattered showers to
develop, mainly along and se of I-71. Lows will remain warm with
lows in the lower to mid 50s.
.LONG TERM /THURSDAY THROUGH TUESDAY/...
No large scale swings in the forecast this afternoon for the
extended period. Tried to limit shower activity on Thursday
first in the southeast during the morning as the warm front
lifts northeast through the region, then along and north of the
I-70 corridor in the afternoon and early evening. Forcing then
lifts well north and away from the immediate CWA, with good
southerly flow setting up on Friday. Thursday night lows will be
unseasonably mild (for high temperatures) and be in the low to
mid 50s. Friday will see highs ahead of any rainfall reach into
the 70s. Have pushed back the threat of showers on Friday to
ramp up in the afternoon, and added the thunder threat from the
afternoon into the overnight period. Feel that most of the
convective threat will occur after 0z, peaking with fropa during
the late evening, and then rapidly ending by daybreak in the
Saturday will see cold pool convective showers possible and
experience more normal high temperatures in the 40s. The lower
lcls in the cool airmass may support some snow showers in
northern portions of the CWA - again north of the I-70 corridor
and primarily late in the day and early evening with quickly
waning precipitation chances.
The cooler temperatures will last through the weekend and then
see a warmup for next week, along with increasing threats for
rain, developing into thunderstorms with a cold frontal passage
expected Tuesday or Wednesday. Expect any rain in the warm
sector with the next system to be minimal and then be
concentrated with the diurnal passage of the front. Even with
this, blended models and have some low chances for showers
starting as early as Monday.
.AVIATION /03Z WEDNESDAY THROUGH SUNDAY/...
Rain showers are continuing to spread slowly east northeast
across the mid Ohio Valley early this evening. This is in an
area of upper level diffluence to the north of an upper level
low moving across the southern Mississippi Valley. This is
forecast to slowly shift east overnight and weaken. In the
meantime though, expect fairly widespread shower activity to
persist along and southeast of the I-71 corridor this evening
and into the overnight hours. A weak secondary short wave will
also move across the southern Great Lakes and this may help some
scattered shower activity linger elsewhere across the area
through the overnight hours. Cigs are currently running VFR but
as the low levels moisten up, expect them to drop through MVFR
later tonight and into IFR late tonight into Wednesday morning.
This will also likely be accompanied by some MVFR to IFR fog
restrictions later tonight and into Wednesday morning. We should
then see a gradual improvement back into MVFR cigs as we
progress through the afternoon and the low levels begin to dry
out a bit.
OUTLOOK...MVFR ceilings and vsbys are possible Wednesday night.
Thunderstorms are possible Thursday and Friday. MVFR ceilings
and vsbys are possible Saturday.
Record High Temperatures
Date CVG CMH DAY
Wed 2/22 71(1922) 70(1930) 69(1922)
Thu 2/23 72(1985/1996) 66(1906/1985) 68(1985)
Fri 2/24 72(1930) 72(1961) 67(1930/1961)