Area Forecast Discussion
Issued by NWS Jackson, KY

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FXUS63 KJKL 281915

National Weather Service Jackson KY
315 PM EDT Tue Mar 28 2017

.SHORT TERM...(This evening through Wednesday night)
Issued at 312 PM EDT TUE MAR 28 2017

A shortwave trough and surface low pressure continue to depart to
the north and east of the region while surface high pressure is
beginning to nose into the OH Valley. Height rises are also occurring
the wake of the departing shortwave trough with the axis of this
ridge currently extending from the central Gulf of Mexico northwest
toward the Mid Ms Valley region. Upslope flow, especially above the
surface is combining with daytime heating to produce shallow light
rain showers and sprinkles or drizzle. Statocu and cumulus have been
rather persistent, but breaks and thin spots in the clouds have
allowed many locations to experience temperatures climbing into the
low to mid 60s under the increasingly strong late March solar

The surface low and shortwave trough will continue to depart to the
east and northeast tonight while upper and surface ridging build
into the OH Valley and Appalachians. Through this evening, isolated
to scattered showers or light drizzle should persist, but wane this
evening with loss of daytime heating and low levels stabilize.
However, low level moisture is expected to remain trapped below a
subsidence inversion tonight and the degree of clearing is uncertain
though give the current rather extensive area of clouds currently
over the Great Lakes and OH Valley at this time. This and model
forecast soundings of persistent moisture at about 850 mb and below
and time heights through this evening and tonight, only some partial
clearing especially in the south is anticipated. Radiational valley
fog is possible and a mix of this and stratus build down fog is also
possible, though confidence in the details is not high.

The axis of the upper level ride is expected to continue to move
east and should move across the area Wednesday evening while the
next in a series of upper level troughs/upper lows moves from the
Southern Plains and begins to nears the MS Valley late. Meanwhile
surface low pressure is expected to track from West TX to MO. Clouds
should decrease on Wednesday morning, with milder temperatures
compared to today. The pattern of upper level ridging beginning to
depart and surface high pressure departing is favorable for some
valley fog as well as at least a small to moderate ridge valley
split with favorable net radiational cooling conditions for the
normally colder eastern valley locations.

.LONG TERM...(Thursday through Tuesday)
Issued at 314 PM EDT TUE MAR 28 2017

The long term discussion will be issued shortly.


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

MVFR to VFR sailings were reported at observation and these
should continue for the first 4 to 8 hour of the period. Patchy
light rain, drizzle or showers may also affect JKL and SJS early
in the period. Despite high pressure building into the area,
subsidence from mid and upper level ridging should help keep low
level moisture and clouds in place. Bases of these low clouds
should tend to lower 0Z to 6Z with lowering to IFR in some
locations and to MVFR in others. Daytime heating by the 12Z to 18Z
period and drier air moving in should lead to improvement through
the MVFR range and into the VFR range in most locations. Some
stratus build down and or radiation fog is also possible during
the 0Z to 14Z period, but confidence was not high enough to
include attm. Winds should generally remain light through the




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