Area Forecast Discussion
Issued by NWS Jackson, KY

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FXUS63 KJKL 211900
AFDJKL

AREA FORECAST DISCUSSION
National Weather Service Jackson KY
300 PM EDT Sat Oct 21 2017

.SHORT TERM...(This evening through Sunday night)
Issued at 300 PM EDT SAT OCT 21 2017

A ridge of high pressure will bring dry and warmer than normal
weather to eastern Kentucky through early Sunday evening.
Scattered to broken high level cloud cover will stream across the
area during that time. Highs on Sunday should be similar to today,
with max readings in the upper 70s to lower 80s expected. Tonights
low will also be warmer than normal, with minimum readings ranging
from the upper 40s to the mid 50s across the area. Cloud cover
will finally begin to increase Sunday evening, as a large trough
of low pressure aloft, and its attendant surface cold front,
begin moving across the region. We should see the first rain
showers begin moving into the southwestern portion of the forecast
area late Sunday night.

.LONG TERM...(Sunday night through Friday)
Issued at 430 AM EDT SAT OCT 21 2017

Models are in good agreement through the bulk of the extended
portion of the forecast, with more significant differences showing
up in the latter 48 hours or so. The Canadian solution appears to
be the outlier, with slightly better agreement between the ECMWF
and GFS. While not great, the ECMWF has shown the best consistency
through the last couple of runs. Overall the pattern is amplified
and progressive. Digging, amplifying northern stream energy
appears to lift a southern stream storm system up and through the
Ohio Valley region early in the period. But significant
differences in details remain with strength and timing of short
wave energy tracking through the core flow of the eastern CONUS
trough. Bottom line is that some phasing of these two systems will
be possible which would influence the evolution and timing of
events through the first half of the extended. Mid and upper level
pattern then shifts rapidly during the last 72 hours of the
period as the eastern CONUS trough lifts out to the northeast in
response to energy carving out a deep trough across the western
CONUS. The ECMWF is a bit more amplified and slower with the
evolution of the pattern in general and digs the trough further
west. The GFS advertises a much broader trough that encompasses
just about the entire lower 48, which in turn brings storm systems
further east more rapidly with time.

For sensible weather a low pressure system will develop over the
Gulf of Mexico and move rapidly northward, through the deep south
and into the Commonwealth by Monday. This system will bring ample
moisture and produce a soaking rain for our area. At present much
of the area could see between an inch and an inch and a half of
rainfall from Monday through Tuesday. A strong cold frontal system
will sweep southward into the region late Monday night and through
eastern Kentucky by early Tuesday morning. Immediately after a
clipper like system will drop rapidly southeastward out of Canada
and through the upper Ohio Valley by late Wednesday. Combined
these three systems will usher in a breif shot of much colder air
for our area during the mid week time frame. Temperatures will be
low enough Thursday morning that frost will be a possibility,
especially in our more sheltered valley locations. Thereafter
temperatures moderate back up to normal levels through the
remainder of the forecast window.

&&

.AVIATION...(For the 18Z TAFS through 18Z Sunday afternoon)
ISSUED AT 122 PM EDT SAT OCT 21 2017

The TAF sites should experience VFR conditions through out the
period, with light winds and dry conditions also expected. The
only cloud cover of note should be SCT to BKN high clouds that
will persist during the period as well. Any fog that forms late
tonight should be confined to valley floors and near bodies of
water.

&&

.JKL WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

SHORT TERM...AR
LONG TERM...RAY
AVIATION...AR


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