Area Forecast Discussion
Issued by NWS Louisville, KY

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FXUS63 KLMK 171906

Area Forecast Discussion
National Weather Service Louisville KY
306 PM EDT Tue Oct 17 2017

.Short Term...(This evening through Wednesday night)
Issued at 244 PM EDT Tue Oct 17 2017

GOES-16 shows mostly clear skies across the region this afternoon
with only some high cirrus drifting in from Western Kentucky.
Temperatures are generally ranging from the low to mid 60s with
dewpoints in the upper 30s to low 40s. High pressure over eastern
Kentucky and West Virginia has kept surface flow relatively light.
Overall a fantastic fall day for southern Indiana and central

Decided to lean on the cool side of model guidance for tonight`s
setup. While the surface high will be drifting east of the CWA
overnight setting up a southerly return flow, several model
soundings develop a strong inversion with light to calm winds across
the region. Should see temperatures falling into the low 40s to
upper 30s by sunrise tomorrow, with cooler temperatures in sheltered
areas and valleys where patchy frost could develop again. The threat
of widespread frost is low, so have highlighted the frost potential
in an SPS. River valley fog should form again tonight as most bodies
of water are still quite warm, and some of that fog could be dense
at times. This has also been highlighted in the SPS.

850mb flow begins to veer around to the southwest tomorrow afternoon
and advect in some slightly warmer air. As a result, afternoon high
temperatures should be about 3-5 degrees warmer compared to today.
The warmer temperatures will also create a strong cap around 850mb,
and keep any cloud cover limited to just some passing cirrus.
Temperatures tomorrow night will be cool once again, but with
slightly higher winds expected through the lower atmosphere, lows
should fall into the low to mid 40s.


.Long Term...(Thursday through Tuesday)
Issued at 258 PM EDT Tue Oct 17 2017

Not many changes to the long term discussion. High pressure will
keep the region dry Sunday/Monday when a large upper level trough
and associated cold front approach from the west. Long range
guidance still has some differences in timing and amplitude of the
trough, but there is general agreement that it will be potentially
wet and cloudy Sunday into Monday, with much cooler temperatures to
follow behind the cold front.


.Aviation...(18Z TAF Issuance)
Issued at 122 PM EDT Tue Oct 17 2017

High pressure over the mid-Atlantic will keep skies clear and winds
light through the TAF period. Another night of river valley fog is
expected which could impact BWG. Otherwise, HNB/SDF/LEX are expected
to remain VFR.




Short Term...DM
Long Term...DM
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