Area Forecast Discussion
Issued by NWS Louisville, KY

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FXUS63 KLMK 210744

Area Forecast Discussion
National Weather Service Louisville KY
344 AM EDT Sun Apr 21 2019

.Short Term...(Today and tonight)
Issued at 335 AM EDT Sun Apr 21 2019

...Dense Fog this Morning...

Satellite imagery and METARS indicate areas of dense fog have
developed over portions of southern Indiana and central Kentucky.
Light winds, plentiful low level moisture, and a good subsidence
inversion are all in place promoting dense fog formation/expansion.
High-res model guidance indicates the dense fog areas will continue
to expand in areas where clouds have cleared during the pre-dawn
hours, thus will be issuing a Dense Fog Advy through 9 AM EDT/8 AM
CDT this morning for all of southern Indiana and much of central
Kentucky.  In addition to fog this morning, some patchy frost is
possible for locations that drop into the mid 30s.

Fog should begin to dissipate after sunrise with mostly sunny skies
expected by mid to late morning.  A pleasant day is in store
after the morning fog with highs in the 62-71 degree range.

Tonight expect continued dry conditions although temperatures won`t
be quite as low as this morning.  Lows in the mid 40s to around 50
are expected. Some patchy fog looks possible east of I-65 late
tonight into Mon morning.


.Long Term...(Monday through Saturday)
Issued at 320 AM EDT Sun Apr 21 2019

Shortwave ridging aloft will bring warm and dry weather for Monday
and most of Tuesday. Temps will run solidly above normal both day
and night, even with increasing cloud cover and SW winds on Tuesday.

Northern stream wave swings into the Great Lakes late on Tuesday,
pushing a weak cold front SE into the Ohio Valley. Will carry chance
POPs north of the WK/BG Parkways late Tue afternoon, expanding a bit
farther into south-central KY on Tue night.

Look for a mild but unsettled pattern through the middle part of the
week.  Tuesday night`s front will hang up, supporting periodic rain
chances until a southern stream wave pushes into the Deep South on
Friday. Highest POPs will be late Thursday and Thursday night with
the best forcing. Diurnal temp ranges will be narrower through the
period, with temps slightly above normal by day and well above
normal by night.

Sfc high pressure over the Great Lakes and zonal flow aloft will dry
us out nicely, with Chamber of Commerce weather for late Friday and


.Aviation...(06Z TAF Issuance)
Updated at 135 AM EDT Sun Apr 21 2019

As skies clear from west to east early this morning, fog will become
a concern at SDF/HNB/BWG.  HNB/BWG already have fog causing periodic
IFR-LIFR conditions.  Expect this to continue overnight with some fog
expected to develop at SDF as well.  Clearing skies, light winds,
and a good subsidence inversion will all favor fog.  Drier air
pushing in the WNW may dampen fog somewhat, but so far antecedent
moist low levels are winning out with patchy fog already developing
across the area.  SDF will be on the edge of the cloud shield for
the next 1-3 hrs so fog will be slower to form there. As a result,
will remain conservative with MVFR forecast.  Low IFR clouds should
stick around at LEX until 14Z.  All TAF sites should be VFR by mid
morning as fog/low clouds exit the area.


IN...Dense Fog Advisory until 9 AM EDT /8 AM CDT/ this morning for

KY...Dense Fog Advisory until 9 AM EDT /8 AM CDT/ this morning for



Short Term...AMS
Long Term...RAS
Aviation...AMS is the U.S. government's official web portal to all federal, state and local government web resources and services.