Area Forecast Discussion
Issued by NWS Louisville, KY

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FXUS63 KLMK 211403

Area Forecast Discussion
National Weather Service Louisville KY
1003 AM EDT Sun Apr 21 2019

.Forecast Update...
Issued 1000 AM EDT Sun Apr 21 2019

Area webcams and automated sites are showing much better
visibilities out there now, with fog lifting to a low stratus deck
in some spots and clearing out to blue sky in others. Have allowed
the Dense Fog Advisory to expire and sent out updated products.

Issued 855 AM EDT Sun Apr 21 2019

Based on webcams and early morning visible satellite imagery,
decided to locally extend the Dense Fog Advisory for most of the
previous area until 10 AM. SDF continues with 1/8th mile visibility
right now, though here at the office, southeast of SDF, it`s a
beautiful start to the morning under clear skies.


.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...(12Z TAF Issuance)
Updated at 650 AM EDT Sun Apr 21 2019

Dense fog is expected to continue at HNB/BWG through 14-15Z before
dissipating.  SDF should remain in the IFR-MVFR range with vsbys
before improving after sunrise. IFR-MVFR clouds should stick around
at LEX until 15Z. All TAF sites should be VFR by late morning as
fog/low clouds exit the area.  Winds will remain light and vrb
throughout the TAF period.




Short Term...AMS
Long Term...RAS
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