Area Forecast Discussion
Issued by NWS Wilmington, OH

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FXUS61 KILN 231418

Area Forecast Discussion
National Weather Service Wilmington OH
1018 AM EDT SAT JUL 23 2016

An upper level ridge positioned over the nations mid section will
dominate the weather over the weekend before finally breaking
down at the beginning of next week. Hot and humid conditions are
expected through the weekend with heat index values above 100
degrees. Periods of storms will form through the weekend due to
the high levels of moisture. The chance for precipitation
increases early next week with the expected passage of a cold


River valley fog will continue to burn off this morning, giving
way to mostly sunny skies across the entire area. Upper level
ridging over the central part of the country will expand slightly
into the Ohio Valley today. This will create an environment less
favorable for convection (compared to yesterday) as a fairly
strong cap will likely remain in place through the afternoon and
evening hours. Nevertheless, with large amounts of instby, cannot rule
out a pop up shower or storm during peak diurnal heating,
especially for northern parts of the FA.

Some of the warmest temperatures of the year thus far are likely
today across a large portion of the FA. With expected lack of
organized convection and an expansion of the ridge into the
region, anticipate highs to top out in the lower 90s for the
entire area. This, combined with dewpoints in the low to mid 70s,
will create heat indices of 100 or greater area-wide. Therefore,
have continued heat headlines.


Isold storms which develop in the heating of the day will quickly
dissipate this evening. Expect the remainder of the night to stay
dry with humid lows in the lower and middle 70s.

Another hot and humid day for Sunday with highs in the lower 90s
and heat indices of 100 to 103 degrees. Have mentioned these hot
conditions with the expectation that additional heat headlines
may be required.

Again a good deal of uncertainty exists regarding convection on
Sunday. With the upper level ridge sliding east into the Ohio
valley would not be surprised if the area remains dry. Have
limited pops to 15 percent (slight chance) during the afternoon
with a lack of forcing.

Shortwave energy moving thru the Great Lakes flattens the northern
portion of the ridge with a surface cold front pushing into the
area Monday. Have introduced high chance pops into the nw late
Sunday night and then spread these pops across the entire cwa
Monday. Due to clouds and pcpn temperatures will be slightly cooler
Monday ranging from the upper 80s nw to the lower 90s se.


Tuesday into Wednesday the front will remained stalled just south
of the area and slowly start to wash out. Even behind the front
though 850 temperatures are forecasted to be around 18 degrees C
so am expecting temperatures near climo. Late Wednesday into
Thursday a shortwave will approach the area from the west finally
washing the leftover stationary front out. As this happens higher
PWATs will again wash over the area with 2.00" + values moving in.
Have trended PoPs up towards the end of the long term to account
for this.


BR will reduce visibility this morning in a very humid airmass.
BR will burn off within an hour of issuance. Expect BR and FG to
form again late in the forecast in the persistently moist regime.

Sky cover will consist of cirrus circulating around an upper high
centered to the west, and a FEW to SCT cumulus that form mainly
during daylight hours. Thunderstorms are not forecast today due
to weak forcing though we have an unstable airmass. Winds will
stay light west.

OUTLOOK...Thunderstorms possible Sunday through Monday.


OH...Heat Advisory until 8 PM EDT this evening for OHZ026-034-035-
     Excessive Heat Warning until 8 PM EDT this evening for OHZ061-
KY...Heat Advisory until 8 PM EDT this evening for KYZ089>100.
IN...Heat Advisory until 8 PM EDT this evening for INZ050-058-059-


LONG TERM...Haines
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