Area Forecast Discussion
Issued by NWS Louisville, KY

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037
FXUS63 KLMK 270951
AFDLMK

Area Forecast Discussion
National Weather Service Louisville KY
551 AM EDT FRI MAY 27 2016

...Forecast Update...
Issued at 540 AM EDT Fri May 27 2016

Solid rain shield still lifting from the Missouri Bootheel into
southern Illinois, and maybe just grazing the Wabash Valley. Seeing
a small signature of a warm advection wing and/or last night`s old
boundary lifting north across western Kentucky, but no sign of
precip breaking out this far east. Hi-res models are coming around
to the idea of staying dry through the morning, but given the juicy
atmosphere and the continued possibility of a stray shower across
the Hoosier National Forest, will leave the early morning 20 POP as-
is.

Webcams and sfc obs are showing a few decent pockets of fog, mainly
across south-central KY where the heaviest rain fell Thursday. Don`t
think this will last very long as the boundary should lift through
shortly, but did tweak the grids to show this brief, patchy fog for
a couple hrs.

.SHORT TERM (Now through Saturday)...
Issued at 300 AM EDT Fri May 27 2016

Unsettled pattern remains in place with amplified flow aloft, and a
juicy air mass residing over the Ohio Valley. However, the best
moisture feed remains over the Mississippi Valley, so it`s been a
mainly dry night across central Kentucky, and only a couple of
showers have developed over southern Indiana, but still confined to
the Wabash Valley.

Boundary left over from Thursday afternoon convection is quite
difficult to identify in a sloppy surface pressure pattern, but
could still spark a shower or storm this morning before it lifts
north of the area. Otherwise expect a dry day across much of central
Kentucky as we`ll be in a squeeze play between the main moisture
plume to our west, and isolated-scattered storms that over the
Cumberland Plateau. The latter convection will likely bleed
northward into east-central Kentucky, including the Bluegrass
region, late in the day into this evening. Confidence is limited so
will only carry a 20 POP there. With a better shot at sunshine
today, temps will push well into the mid/upper 80s, and we could
even squeeze out a 90, with Louisville as the most likely location
given the heat island influences.

Upper low tries to lift out of the Plains on Saturday, and impulses
coming through the base of that trof will make for a more
convectively active day across the Ohio Valley. Still not expecting
anything organized, and certainly not a day-long washout, but enough
of the area will see rain to justify a low-end likely POP in the
afternoon.  Plenty of clouds will hold temps in check, so most
locations will top out in the lower/mid 80s, but depending on timing
a few spots west of I-65 could stay in the 70s.

.LONG TERM (Saturday Night through Thursday)...
Issued at 255 AM EDT Fri May 27 2016

Upper pattern really flattens out Sat night, so the last of the
widespread/organized precip should exit the region during the
evening. However, there`s not much of a change in the low-level air
mass, so we`ll continue to see warm and humid conditions well into
next week. Will depict a warmer and drier pattern, especially
heading into Mon-Tue, but with such a juicy air mass it won`t take
much to spark diurnal convection, so will continue to advertise 20
POPs by day and dry nights. Temps will be solidly above normal, but
it will be difficult to get enough sunshine to crack the 90 degree
mark in this pattern.

Toward mid-week, another upper trof digs into the Plains and the
pattern amplifies again. The other unknown is whether this pattern
can tap into remnant moisture from the tropical system that`s
progged for the Southeast this weekend. Will see POPs ramp back up
to a solid chance Wed-Thu, and daytime temps will not be quite as
warm.

&&

.AVIATION (06Z TAF Update)...
Issued at 120 AM EDT Fri May 27 2016

Convective debris mid and high level clouds continue across central
KY at this time with VFR conditions. With rain yesterday and absence
of low clouds, still expect at least some MVFR vsby fog at times
early this morning at BWG and LEX (possibly SDF).

Current radar shows showers over southwest KY. Models suggest some
showers will move and/or develop northeast overnight, so will
include VCSH at SDF after 09z, although conditions should remain VFR.

On Friday, any showers near and north of OH River will lift north-
east leaving dry VFR weather for the 3 TAF sites for much of the
day. Surface winds will be SSW at 10-15 kts. More mid and high level
debris clouds possible Friday night, but should have little overall
effect, as surface winds become S to SE around 5 kts.

&&

.LMK Watches/Warnings/Advisories...
KY...NONE.
IN...NONE.
&&

$$

Update.........RAS
Short Term.....RAS
Long Term......RAS
Aviation.......TWF



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