Area Forecast Discussion
Issued by NWS Louisville, KY

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756
FXUS63 KLMK 241017
AFDLMK

Area Forecast Discussion
National Weather Service Louisville KY
617 AM EDT Mon Apr 24 2017

...Updated Aviation Discussion...

.Short Term (Now through Tuesday)...
Issued at 244 AM EDT Mon Apr 24 2017

Weak ridging will keep the short term dry other than perhaps a stray
sprinkle or two in the Lake Cumberland region early this morning.
Persistent northeast flow and high RH in the 925-850 layer under a
low level inversion and around a circulation centered over Georgia
will keep clouds in the sky today, especially south of the Ohio
River. Clouds are expected to begin to partially break up tonight,
and we should see more sun tomorrow than today.

Sunnier locations, such as from southern Indiana into north central
Kentucky, should see temperatures rise into the lower 70s today.
Cloudier regions will stay in the 60s. With the weak ridging moving
in, the surface pressure gradient will be more relaxed resulting in
lower wind speeds and less gustiness today compared to the past
couple of days. After seasonable lows in the 50s tonight, the spring
sun will take temperatures into the 70s everywhere on Tuesday.

.Long Term (Tuesday Night through Sunday)...
Issued at 257 AM EDT Mon Apr 24 2017

An upper trof will dig into the Plains Tuesday night/Wednesday. A
lead shortwave will eject from the trof and move over the lower Ohio
Valley and into the Great Lakes Thursday. Surface low pressure to
our northwest will swing a cold front through here during the day
Thursday, accompanied by showers and thunderstorms. Although the EC
and GEM are still advertising a quick fropa, the GFS has slowed its
frontal passage down a bit versus previous runs. This slower timing
would increase the chances for strong storms ahead of the front.

Weaker upper waves will pass by Thursday night and Friday,
continuing the chance of scattered showers/storms. Confidence then
increases for more widespread convection Friday night as the GFS,
ECMWF, and GEM generally agree on a surface low organizing over the
Texas Panhandle with a warm front reaching northeast into the Ohio
Valley.

New energy aloft will dive through the Pacific Northwest and
reinforce the Plains upper trof over the weekend. At the surface the
Texas low will head northeast, lifting its warm front well north of
us. We will be within the warm sector of the storm for the weekend,
then, with highs both days well into the 80s. We can`t completely
rule out the possibility of thunderstorms in the warm, unstable
atmosphere but will keep PoPs low at this point.

&&

.Aviation...(12Z TAF Issuance)
Issued at 615 AM EDT Mon Apr 24 2017

Ceilings range from fuel-alternate MVFR across south-central
Kentucky to VFR closer to the Ohio River as moisture/clouds pivot
back across the area associated with an upper level low centered
over the Deep South. Expect this stratus deck to persist through the
day, gradually lifting back above VFR at BWG late this morning or
this afternoon.

There`s good consensus that the strato-cu will break up late in the
afternoon or this evening, slowest at BWG and LEX. Plan on
northeasterly flow to continue then become light/variable tonight.
If clouds do indeed clear out then light fog would be possible at
BWG and perhaps at LEX late tonight into Tuesday morning. There`s
enough confidence to introduce light fog at BWG at this time.

&&

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

$$

Short Term........13
Long Term.........13
Aviation..........ZT



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