Area Forecast Discussion
Issued by NWS Jackson, KY

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FXUS63 KJKL 251900

National Weather Service Jackson KY
300 PM EDT Sat Mar 25 2017

.SHORT TERM...(This evening through Sunday night)
Issued at 300 PM EDT SAT MAR 25 2017

The short term period looks to be quite active, with very good
chances for showers and thunderstorms tonight through tomorrow
night. A cold front that will be moving across the central and
southern Mississippi valley tonight will be our weather maker.
This boundary will interact with the warm and moist air mass that
is already in place across the region and will spark showers and
scattered thunderstorms as it moves quickly across the Ohio and
Tennessee valleys. The system should be progressive enough to keep
hydro issues at a minimum, although rain could be locally heavy
for short periods of time with any thunderstorms or intense
showers. The rain should taper off across the area late Sunday
night into early Monday morning, but a few showers will likely
linger across the area, as another weather system will be
following on the heels of the one that moves through the area
tonight. A few of the storms on Sunday may contain strong gusty
winds and small hail. Temperatures will continue to be well above
normal, with lows in the 50s the next two nights and highs around
70 on Sunday.

.LONG TERM...(Sunday night through Friday)
Issued at 435 AM EDT SAT MAR 25 2017

The first of a string of upper level waves will be placed across the
Upper Ohio Valley/Southern Great lakes region in a negatively tilted
position. A weak low will be stacked with it and trailing cold front
attempting to progress through the area. There will be lingering
showers and thunderstorms Sunday night and slowly wane from west to
east through Monday. Did keep chance to slight chance POPs going
into Monday, as the front may in fact stall out near by. That said,
another wave will be on the heels of the previous and will eject
east into the TN/OH valleys by Monday night. Another Low will
develop and bring the front back across the region leading
additional showers and thunderstorms Monday night into Tuesday. This
is where is gets convoluted as front may in fact stall again nearby,
but the agreement on this becomes less in the deterministic models
past this point. Right now given a upper level ridge builds east
will cap POPs at slight on Wednesday and mainly confine these to the
southern portions of the CWA.

Another upper level wave will move out of the Four Corners into the
Southern Plains Wednesday and progress east by Thursday. However,
the models diverge on how this will evolve and struggle with what
looks like some phasing issues. This leads to more uncertainty and
would think all the issues leading in will have affects on this part
of the forecast period as well. Not to mention the timing and
evolution differences seen in the ensemble mean of the GFS versus
the operational run. Given this felt like POPs would need to be
caped at chance and unsure on where the highest POPs will truly
exists. Therefore, will keep close to general trends in the model
blend. Despite the active pattern it does look like a extended
period of above normal temperatures will remain the story throughout
the long term period.


.AVIATION...(For the 18Z TAFS through 18Z Sunday afternoon)

VFR conditions are expected to hold until around 9Z at LOZ and
SME. Scattered to numerous rain showers, and few thunderstorms,
should be moving into the area around LOZ and SME by then. JKL and
SYM can expect the showers and storms around 12Z, with SJS not
seeing any precipitation in the vicinity until near the end of the
TAF period. Any storms or intense showers could bring MVFR, or
locally worse, conditions to any given airport. As for the rest of
today, southerly winds of around 10 mph could gust to around 20
mph through 22Z. BKN to OVC layers of high level cloud cover will
be in place to begin the TAF period, but will gradually be
replaced by middle and low level clouds as a weather system
approaches from the west this evening and tonight.

South to southwest winds will pick up and gust to around 20 kts
over much of the area during the day Today.




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