Area Forecast Discussion
Issued by NWS Wilmington, OH

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FXUS61 KILN 070528

National Weather Service Wilmington OH
1228 AM EST Sun Mar 7 2021

High pressure west of the region will settle over the Ohio
Valley early Sunday morning. It will move slowly southeast and
by Monday, a return to southerly flow at the surface will mark
the start of a warming trend. This trend will continue through
at least Thursday as a frontal system develops over northern


Quiescent weather through the night. Winds will remain light.
There is some lower mid level moisture which could produce a few
clouds. But overall, good radiational cooling. Just some minor
adjustments to temperatures.


Bumped temperatures on Sunday a bit higher and think that with
abundant sunshine and a lighter and much more variable wind
field there is room to go even warmer. At least not having a
reinforcing cold advection should permit readings to be a few
degrees warmer than today. Nighttime lows will not nearly drop
as low given a weak southwesterly flow, even with clear skies.
Expect a w-e range from 30 or low 30s to the upper 20s or near
25 in the Hocking Hills.


Tranquil weather will be the story through the first part of the
long term period as surface high pressure settles into the TN Vly.
With a system passing through the northern Great Lakes, the OH Vly
will be positioned in between high pressure to the south and low
pressure to the north on Monday, allowing for breezy conditions
during peak diurnal heating/mixing hours. Will see gusts to 20 to 25
MPH at times Monday afternoon and, to a slightly lesser extent,
again on Tuesday afternoon.

With the relatively dry BL air in place to start the week and the
anticipation for mostly clear skies, trended high temps a bit above
guidance for the start of the workweek, especially with the
expectation for decent afternoon mixing to bring down RH values,
especially Monday and Tuesday. Will see moisture advection increase
by Wednesday, but that`s when the pressure gradient will tighten
even more and WAA will be it`s most robust. This will occur with the
approach of a system into the mid-Mississippi River Vly through

Will see WAA/isentropic lift increase during the day on Wednesday,
with a fairly stout thickening of mid/upper level clouds. Some
solutions are trying to show some spotty measurable pcpn during the
afternoon on Wednesday, but wouldn`t be surprised to see this
overdone/end up more like a virga environment with the relatively
dry air still in place in the low levels (reinforced by diurnal
mixing). Will see LL moisture advection increase from the WSW during
the daytime period, but do anticipate that most of the measurable
pcpn/best rain threat will actually hold off until Thursday. Winds
will gust to around 30-35 MPH during the daytime on Wednesday.

Despite fairly high confidence in a wetter-than-normal period for
the second half of the workweek, the details are far from ironed-out
yet. The details relate specifically to the progression of the cold
front through the OH Vly and whether additional S/W energy ejecting
east into the plains will be sufficient to hold up the southward
progression of the front Friday/Friday night and what implications
that may have locally on a potential heavy rain threat within the
region. With pretty much all solutions showing a large dome of
midlevel high pressure in the Gulf by Thursday, suggesting that
ridging in the southeast U.S. is going to be fairly tough to budge,
the progression of the front south/clearing the ILN FA will
ultimately be determined by how far south the northern stream system
digs into the Great Lakes/northeast U.S. Thursday into Friday. At
some point, whether the frontal boundary gets held up in the local
area or is able to be pushed far enough south to clear the ILN FA
Friday/Friday night, the front will pivot back north by the weekend
as the main upper level low digs into the Four Corners region,
eliciting mid/upper level ridging downstream into the MS/OH Vlys

High confidence exists in above normal temperatures Monday through
Thursday with a slight cooldown Friday before warmer air builds back
into the region for the weekend. The best rain chances in the long
term period will be Thursday/Friday.


Some areas of VFR stratocumulus will continue to push southeast
across the area through the pre dawn hours. Mostly clear skies
and VFR conditions are then expected through the remainder of
the TAF period as high pressure pushes slowly east across the

OUTLOOK...Wind gusts up to 30 kt possible on Wednesday. MVFR
ceilings and visibilities possible on Thursday.




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