Area Forecast Discussion
Issued by NWS Jackson, KY

Home | Current Version | Previous Version | Text Only | 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 KJKL 080812

National Weather Service Jackson KY
312 AM EST Thu Dec 8 2016

.SHORT TERM...(Today through Friday)
Issued at 312 AM EST THU DEC 8 2016

A strong surface high pressure ridge, stemming from the Arctic
center anchored across the Northwest Territories, remains nosed
in from the Continental Divide through the Plains, Midwest, and
Ohio Valley regions. Aloft, a deep trough remains poised across
the CONUS, with an upper level low moving eastward into Quebec,
with a short wave trough moving across the Midwest.

In eastern Kentucky, some light radar returns have been showing up
for the past few hours, although cloud bases remain at or above 7k
feet agl for most locations, with any flurry activity few and far
between. Current temperatures are in the low 30s, with some upper
20s invading from far northern Kentucky.

Much colder temperatures will continue to be the main story
through the short term, as the upper trough gradually shifts
east, with a secondary surface high pressure center eventually
becoming established across the mid-Mississippi Valley through

Today will feature perhaps a few flurries into the mid-morning
hours, before clouds thin out and west to northwest winds pick up
and turn a bit gusty, as the cusp of the arctic air invades. Highs
today will be in the mid 30s, with most marks established by noon.
Temperatures will then fall off through tonight, reaching the
teens to lower 20s by dawn Friday. Lower clouds, containing some
flurries at times, will also move in overnight and will linger
into Friday. Highs on Friday will range from the upper 20s to
lower 30s.

.LONG TERM...(Friday night through Wednesday)
Issued at 312 AM EST THU DEC 8 2016

We start the period with high pressure in control at the surface.
Any residual low clouds remaining from the day should erode pretty
quickly Friday evening but some mid and high clouds may interfere
with radiational cooling conditions across our northern counties.
Nonetheless, it will be cold with lows in the teens. Saturday will
then be cold but with some sunshine through increasing high level
cloudiness. These clouds should thicken up Saturday night but temps
will likely still drop toward 20 in our eastern valleys.

Our next weather maker is still due to begin affecting our area on
Sunday as a shortwave tracks across the Midwest and Great Lakes
region sending a surface low across the Ohio Valley to our north.
Models are a tad slower with the onset of precip with this system
when compared to last night and the bulk of any precip is now shown
to enter the scene late Sunday into Sunday night. Temps are cold
enough along and north of I-64 that it is possible a little snow may
mix in Sunday evening before warm advection kicks in and temps
actually warm overnight. The 08/00z ECMWF continues be slower in
exiting the rain on Monday and that slower trend will be found in
our forecast.

Confidence on forecast details tank beyond Monday. The 08/00z GFS
brings one heck of an arctic front through the area dropping temps
from the 50s Tuesday into the teens on Wednesday. The 08/00z ECMWF
is much tamer, keeping the real cold air to our north. The
SuperBlend looks like a great compromise and will be followed.
This results in a small chance of rain or snow Tuesday into
Tuesday night, and then a small chance of snow on Wednesday with
highs dropping from the 40s on Tuesday back down toward freezing
on Wednesday.


.AVIATION...(For the 06Z TAFS through 06Z Thursday night)

VFR conditions look to hold on through the period. Clouds will
lower to the 6-8k feet agl range through 15z, before thinning out
through the rest of the day. Northwest winds of around 5 kts will
become west to northwest at around 10 kts by noon, with gusts of
around 15 kts at times. Winds will then diminish to around 5 kts
by dusk.




AVIATION...GEOGERIAN is the U.S. government's official web portal to all federal, state and local government web resources and services.