Area Forecast Discussion
Issued by NWS Wilmington, OH

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
445
FXUS61 KILN 151517
AFDILN

Area Forecast Discussion
National Weather Service Wilmington OH
1017 AM EST Fri Dec 15 2017

.SYNOPSIS...
A weak surface low will track through the Great Lakes today,
bringing a chance of light snow to northern Ohio. A surface
ridge builds into the region tonight into Saturday. Persistent
southwesterly flow will bring warmer temperatures into the area
for the upcoming weekend, along with a chance of rain on
Sunday.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
Not easy to draw in grids for cloud cover this morning, with
several bands/swaths of clouds at different levels, and a few
brief breaks to clear mixing in, especially in the southern half
of the forecast area. A bigger concern is whether or not lift
and steepening low level lapse rates associated with the Great
Lakes trough will be enough to develop any snow showers across
central Ohio today -- and the lack of moisture might point away
from any suggestions that accumulating snow will be likely to
occur. Flurries look like a near certainty, especially based on
current upstream observations. No changes are necessary to
current T/Td/Wind forecasts.

Previous discussion >
H5 s/w will swing across the Great Lakes today. A weak sfc low
will develop and move through nrn Lake Huron. Trend of the 00Z
models has been to move the pcpn farther north today, closer to
the center of the low where the lift is better. Held onto some
low chance PoPs in Central Ohio this afternoon, as the lift
maximizes. Skies will remain mostly cloudy as low level moisture
will continue to pool ahead of cold front dropping into nrn
Ohio.

Surface pressure gradient will increase this afternoon. Wind
gusts of 20-25 kts will be possible during the afternoon.

High temperatures will rise to around 30 in the north, and the
mid 30s across the south.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH SUNDAY/...
As the H5 s/w pulls away tonight, a sfc ridge will build into
the ern Tennessee and Ohio Valleys. Clouds will linger tonight,
helping keep temperatures up. Lows will range from the mid to
upper 20s.

Mid level ridge will begin to build in on Saturday. Southerly
flow on Saturday will push temperatures a little above normal.
Highs on Saturday to range from the lower 40s in the north to
the upper 40s in the south.

The ridge will hold on Saturday night, bringing mostly clear
skies. For Sunday, the consensus of the models is to slow the
onset of pcpn. This should allow temperatures to warm enuf that
pcpn should fall as all liquid. Although the extended models
agree on slowing down the onset, they disagree on coverage for
Sunday. The NAM leaves the region dry, while the GFS brings in
some scattered rain. The ECMWF and Canadian bring in a bigger
swath of QPF. Ran a blend, which lowered PoPs down to high
chance. Highs will range from 40 to 45 degrees.

&&

.LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/...
In split flow regime model solutions differ on phasing and
timing of pcpn. Will follow a progressive soln with pcpn ending
during the day Monday and then re-introduce a slight chc late
Monday night into early Tuesday with mean trof developing across
the Great Lakes. Temperatures looks to continue a little above
normal with Monday and Tuesdays highs ranging from the the
lower/mid 40s north to around 50 south.

In northwest flow regime surface high pressure to build into the
region at mid week. This high will offer dry weather with the next
chance of rain holding off until Thursday afternoon/Thursday night.

Temperatures close to normal next Wednesday with highs from the
upper 30s north to the mid 40s south. Reading warm above normal
Thursday with highs of 45 to 50.

&&

.AVIATION /15Z FRIDAY THROUGH TUESDAY/...
VFR conditions will be found over the TAF sites in the Ohio
Valley for the next 24-30 hours. One caveat here is that lower
MVFR cigs may occur north of CVG/LUK this afternoon.

Lower stratus around 4kft will spread into the region as winds
pick up from the west and see gusts to 20-25kt from late morning
until early afternoon. Stratus will hang tough today as a H8
thermal trough remains entrenched over western OH. Late in the
day and moreso in the evening, warm air will be advected in and
should help cut the stratus deck from west to east. It should
also limit any lingering gusty winds with the coming of
nightfall. Northern TAF sites along I-70 corridor will see the
stratus mix out at the tail end of the forecast.

OUTLOOK...MVFR ceilings and visibilities are possible Sunday
into Monday.

&&

.ILN WATCHES/WARNINGS/ADVISORIES...
OH...None.
KY...None.
IN...None.

&&

$$
SYNOPSIS...KC/Sites
NEAR TERM...Hatzos/Sites
SHORT TERM...Sites
LONG TERM...AR
AVIATION...Franks



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.