Area Forecast Discussion
Issued by NWS Louisville, KY

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
FXUS63 KLMK 110515

Area Forecast Discussion
National Weather Service Louisville KY
1215 AM EST THU FEB 11 2016

...Updated Aviation Discussion...

...Forecast Update...
Updated at 931 PM EST Wed Feb 10 2016

Most of the accumulating snow has ended for the night. Will keep
some low chances (20-30%) in the forecast for the next few hours
across south central KY, but most will see only flurries. Some slick
spots on roads will be possible where any light snow was able to
accumulate or where wet roads refroze. Other than pops the forecast
is in good shape and only minor tweaks were made.

Updated at 648 PM EST Wed Feb 10 2016

The band of light snow showers has begun to move into the
southwestern forecast area. The northern edge of the activity is
likely just virga or flurries at this point, but a heavier band has
moved into Logan and portions of Butler county. Model guidance
continues to depict this activity diminishing over the next few
hours and dissipating completely by 06Z. However, some light
accumulations will be possible prior to that with a few tenths of an
inch possible. Though widespread travel problems are not anticipated
at this time, a few slick spots will be possible on area roadways.
Grids have been updated to reflect the current radar trends, but no
big changes have been made.

.SHORT TERM (Now through Thursday Night)...
Issued at 315 PM EST Wed Feb 10 2016

Guidance calling for snows over eastern MO to graze our southwest
forecast area before they dissipate, as the upper-level system
generating them moves into increasingly drier air aloft. This
balancing act will mean a continued lower chance for measurable
liquid equivalent snowfall, though the dry nature of the snow will
mean a chance for up to a few tenths of an inch of new snowfall to
drop across south central Kentucky by daybreak Thursday.

High pressure will build into the Midwest the rest of the day
Thursday, bringing some sunshine to the region. Our southern zones
will take a little longer for the clouds to scatter out. After lows
in the teens tonight, maybe even single digits in our cold spots in
the northeast, we should get a little warmer for highs tomorrow
compared to today. Still our northeast may only see the mid 20s,
whereas south central KY should get into the lower 30s.

The high will shift east of the region Thursday night, with another
clipper system projected to be approaching the region by daybreak
Friday. Increasing clouds may lead to our lows being more in the
evening and then slowly increase or remain steady the rest
of the overnight.

.LONG TERM (Friday through Wednesday)...
Issued at 315 PM EST Wed Feb 10 2016

Models are calling for that clipper system to have the most impact
on the northern half of our forecast area. However, the Euro came in
drier, instead shooting for our southeast forecast area to fire up
with some snow showers in the afternoon. Either way, this system
will not have much moisture to work with here, so totals should stay
under an inch. The Arctic high pressure behind this system will
bring temperatures back down after a "warm" day Friday in the 30s.
Expect highs Saturday to top out in the 20s, some 20 degrees below
normal for mid February. High pressure moving over the region
Saturday night should make for calm conditions and lows in the
single digits to low teens.

That high will shift to our east during the day Sunday, making way
for the next system to impact our area. The GFS/GEM each have a
quicker hitting system, with precip beginning Sunday night. The Euro
is coming in consistent with its previous run of a little later
onset followed by a wide deformation band moving across our area.
This solution would bring quite a bit of snow. To decide which way
to lean, looked at verification stats over the last 6 months for
most reliable pops and found the CONSAll and MOS as well as the GFS
have been the better ones to choose from. So will lean the forecast
that way for now. The consensus will include some info from the
Euro, so the trend will be snow-ier, though still way too early to
advertise totals.

Temperature forecasts will depend greatly on how far north the
associated surface low gets, but for now guidance seems a bit high.
Will go under guidance here as well as the next day, assuming we
have some snow cover on the ground. Models are trying to bring in a
sudden warmup after this Monday system, and think that snow cover
could slow it down a bit. As for precip, some guidance is keeping
light QPF in the northwest flow behind the Monday system.


.AVIATION (06Z TAF Update)...
Updated at 1215 AM EST Thu Feb 11 2016

VFR conditions are expected through the upcoming forecast period.
Only exception is a brief period of MVFR ceilings over at KLEX early
this morning.  NW-SE oriented shield of mid level cloudiness will
persist across the region tonight with bases around 5-6kft AGL.
Surface winds generally be light and variable.  VFR conditions are
expected after sunrise at all the terminals with a light NW wind
through the day.


.LMK Watches/Warnings/Advisories...


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