Area Forecast Discussion
Issued by NWS Louisville, KY

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FXUS63 KLMK 211843

Area Forecast Discussion
National Weather Service Louisville KY
243 PM EDT Thu Sep 21 2017

.Short Term...(This evening through Friday night)
Issued at 232 AM EDT Thu Sep 21 2017

Similar to yesterday, a cu field has developed over the Lower Ohio
Valley and isolated showers and thunderstorms have developed. These
should dissipate towards early evening as the sun goes down.
Thereafter, some patchy fog will be possible again tonight, with the
best chance for any locally dense fog in river valleys. Dry weather
is then expected tomorrow and tomorrow night as high pressure really
builds in.

As to temperatures, tomorrow may officially mark the beginning of
fall, but it will be close to a week before it feels like it. Lows
tonight and tomorrow night will be in the 60s to around 70 in the
Louisville metro. Highs tomorrow will once again top out in the mid
to upper 80s. SDF has hit 90 already today and will likely do so
again tomorrow.


.Long Term...(Saturday through Thursday)
Issued at 242 PM EDT Thu Sep 21 2017

An deep upper level trough will remain in place across the western
CONUS through mid week next week with strong ridging across the
eastern CONUS. High pressure will be in place at the surface as
well. This will lead to dry weather and temperatures topping out in
the mid to upper 80s with lows in the 60s.

As we head into the second half of the week, the ridging will start
to break down and a cold front looks to push through Thursday. This
will bring a chance for some showers and storms Wednesday night into
Thursday. There will also finally be a shift in the pattern with
cooler temperatures in store for the end of the week.


.Aviation (18Z TAF Update)...
Issued at 1255 PM EDT Thu Sep 21 2017

Largely a persistence TAF set with upper ridging strongest just to
our north and west, and a weak, sloppy surface pattern. Pop-up
storms will be possible this afternoon, but coverage remains far too
isolated to warrant inclusion in any of the TAFs. Main challenge is
fog heading into Fri morning. Will primarily follow this morning`s
trends with the most significant restrictions at BWG and HNB, where
it will likely drop below field mins, at least briefly. SDF and LEX
are generally less fog-prone and will only dip into MVFR.




Short Term...EER
Long Term...EER
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