Area Forecast Discussion
Issued by NWS Louisville, KY
FXUS63 KLMK 290533
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOUISVILLE KY
133 AM EDT Fri May 29 2015
...Updated Aviation Discussion...
Updated 1215 AM EDT Fri May 29 2015
Increased POPs to 20-30% over portions of south central and east
central KY overnight as showery activity has picked up in these
areas over the last hour. According to the 0Z NAM, this light
activity should persist through the overnight hours.
Updated 610 PM EDT Thu May 28 2015
Have adjusted the forecast to reflect the latest radar trends. A
few showers and isolated thunderstorms continue across the region,
having been forced by a differential heating/convergence boundary
from an MCV across southern KY. Trends over the past hour have been
for this activity to weaken as it loses what little instability it
had to work with due to the low-level clouds we had through much of
the day. Therefore, will adjust pops to where precip is currently,
but quickly trend the forecast dry by later this evening. The rest
of the forecast looks in good shape.
.SHORT TERM (Now through Friday Night)...
Issued at 245 PM EDT Thu May 28 2015
Cloud cover from this morning, and lingering into the afternoon, has
helped squelch development of precip so far today, despite
pronounced vortmax crossing the Lake Cumberland region this hour.
Still, have some breaks in the clouds now forming, and with that
temperatures are starting to rise. Still have the best chance for
measurable precip close to the vortmax, but would not be surprised
to see an isolated storm pop up anywhere with the heating.
We should get a break from the rain this evening, but low-level
moisture likely will bring another round of at least patchy fog
overnight. Deeper southerly flow late tonight through Friday will
mean continued cloud cover and additional showers/storms, with the
latter starting anytime during the day. Given the uncapped
environment and higher moisture content, still not worried about
severe threats at this point.
.LONG TERM (Saturday through Thursday)...
Issued at 243 PM EDT Thu May 28 2015
The latest model guidance continues to be in generally good
agreement with the pattern through the long term period. An upper
level trough over the Plains will slowly work its way eastward and
become a cutoff low by early next week. It will work its way very
slowly across the deep south through mid week. Chances for showers
and storms will continue off and on through the forecast period.
The most widespread precipitation is expected through the weekend. A
cold front will approach from the northwest on Saturday. A secondary
low will form along this front and move northwest across central
Kentucky Saturday night. The front will continue to sag southward on
Sunday, but looks to stall out somewhere near the KY/TN border.
Showers and storms will develop Saturday in the very moist and
unstable environment. A few of the storms could become strong to
marginally severe. Very heavy rainfall is likely with these storms
given moisture will be pooling south of the frontal boundary. Storms
will continue to be likely into the overnight period and Sunday as
the front moves through.
Monday through the middle of the next work week we will see more of
a diurnal pattern to the storms. Storms look to initiate in the
afternoon with daytime heating and diminish in the evening as the
sun sets. These storms will be more scattered in nature, so it will
not rain everywhere every day despite precipitation in the forecast
After a brief cooldown on Sunday in the wake of the front,
temperatures will rise back into the mid 80s by the middle of the
week with lows in the mid 60s.
.AVIATION (06Z TAF Update)...
Updated 130 AM EDT Fri May 29 2015
Light fog/low stratus will once again pose a TAF challenge for
tonight. LEX did receive some light rain late this evening so think
that this TAF site will probably see the worst flight conditions
toward sunrise. Went ahead and dropped their cigs to low end MVFR.
They could dip into the IFR cat as well, but not confident enough to
add this to the TAFs attm. With low level winds slightly elevated
just off the sfc, think that low end MVFR is more likely. BWG/SDF
should still see MVFR conditions after 9Z as well. Flight
conditions should return to VFR after sunrise with perhaps LEX
taking a bit more time to recover.
Isolated to scattered showers/storms will again be around throughout
the day today and will include in the TAF sites with reduced flight
conditions possible in convection.
Winds will range from E to S early this morning remaining under 7
kts for most of the early morning hours. Winds will increase to 8
to 12 kts for the daylight hours today becoming predominantly SSW.