Area Forecast Discussion
Issued by NWS Louisville, KY
FXUS63 KLMK 280538
Area Forecast Discussion
National Weather Service Louisville KY
138 AM EDT Tue Mar 28 2017
...Updated Aviation Discussion...
Issued at 620 PM EDT Mon Mar 27 2017
Still have some pre squall line storms popping up with hail and some
winds. Just had a report come in from Nelson county of quarter sized
hail. Other line is just along our border with JKL.
Main line has cut through roughly half of the forecast area, so went
ahead and cut out part of the watch box behind the line. Watching
the bowing segment over southern Indiana as well, but the FRH AWOS
site only gusted to 27 knots as the line went through.
Issued at 520 PM EDT Mon Mar 27 2017
Latest RAP mesoanalysis has not been handling the amount of
available CAPE well, as we`ve had several hail reports, mostly
quarter sized or less, though cannot rule out some larger hail in
the pre-frontal airmass from FTK east to KLEX over the next few
The other area of concern is with the more linear feature moving
near the I-65 corridor in Central KY this hour. This area has the
most potential instability to work with, as temperatures are well
into the 70s along our border with TN. Seeing some bowing segments
within this line and have issue warnings accordingly. HPX radar was
showing winds closer to 70 mph with this line, but have not had any
reports near that level just yet.
.Short Term (Now through Tuesday Night)...
Issued at 330 PM EDT Mon Mar 27 2017
...Severe Storms Possible Late This Afternoon and Evening...
Strong to severe storms are likely this afternoon with much of the
area under a Severe Thunderstorm Watch through this evening. These
storms are courtesy of a low pressure system moving northeast
through southern IN/northern KY. 1000-2000 j/kg of CAPE has
developed south of the warm front which was over southern IN as of
315pm EDT. 30-40 kts deep layer shear is supportive of both discrete
cells which we`re seeing on radar in our region currently and will
be supportive of the line of storms over western KY which is progged
to move east through the region between 5pm-midnight tonight.
Storm Threats & Timing
Cellular convection will pose a large hail/damaging wind/isld
tornado threat between now and 8pm EDT.
Expect mainly a damaging wind threat with the line of storms but
small hail and a brief spin-up will be possible as well between 5pm
and midnight EDT.
Convection should decrease after midnight with elevated showers and
perhaps an isld t-storm during the early morning hours in the wake
of the evening complex. Overnight lows will range through the 50s.
For Tuesday, expect some lingering rain showers mainly east of I-65
before the area becomes totally dry late in the day. High
temperatures will be in the 60s. Lows Tues night will range through
the upper 40s/lower 50s.
.Long Term (Wednesday through Monday)...
Issued at 345 PM EDT Sun Mar 26 2017
Expect dry weather on Wednesday before the pattern turns active
again for the latter portion of the week. A strong low pressure
system will bring the chance for showers/storms to the region
beginning on Thu/Fri. Depending on exact evolution and timing, some
of these storms could be on the strong side. Thu looks to the be
the warmest day in the long term period with highs in the mid to
upper 70s across much of the area.
For the weekend, expect dry weather and slightly cooler temps with
highs dropping back into the 60s. Another low pressure system looks
to approach the area again by the beginning of the work week next
.Aviation (06Z TAF Update)...
Issued at 138 AM EDT Tue Mar 28 2017
Low level moisture flowing around the back side of a surface low
moving from the Upper Ohio to the Potomac Valley this morning will
bring low ceilings to the region. The lowest ceilings should take
place a few hours either side of dawn, on the upper end of IFR.
Those ceilings should lift into MVFR during the day today but skies
will remain BKN/OVC as low level moisture gets trapped under a sharp
inversion around 875mb.
We could see a few showers today, especially at LEX, as a weak
surface trof moves from north to south across the area. Any shower
activity will be light and isolated, though, so no need to include
in the TAFs at this time. This boundary will also shift winds from
northwest to north this afternoon.
High pressure nosing into the Great Lakes tonight will shift winds
further, to the northeast, as low ceilings persist.