Area Forecast Discussion
Issued by NWS Louisville, KY

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FXUS63 KLMK 212318
AFDLMK

Area Forecast Discussion
National Weather Service Louisville KY
718 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...(00Z TAF Issuance)
Issued at 715 PM EDT Thu Sep 21 2017

Weak high pressure - at the surface and aloft - will persist over
much of the eastern half of the CONUS during the TAF period. With
surface dew points in the upper 60s to lower 70s and little or no
clouds aloft, nocturnal cooling will again result in early morning
patchy fog. Fog-prone BWG should see the greatest vsby reduction,
with brief IFR conditions again expected.  LEX and SDF will be more
likely to just see a TEMPO into MVFR territory, as should HNB.

Conditions to change little over the next several days, with only a
few afternoon cumulus expected for cloud cover, and winds light and
variable.

&&

.LMK WATCHES/WARNINGS/ADVISORIES...
IN...None.
KY...None.
&&

$$

Short Term...EER
Long Term...EER
Aviation...JBS



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