Area Forecast Discussion
Issued by NWS Jackson, KY

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FXUS63 KJKL 220759

National Weather Service Jackson KY
359 AM EDT Fri Sep 22 2017

.SHORT TERM...(Today through Saturday)
Issued at 359 AM EDT FRI SEP 22 2017

High pressure remains positioned from New England down to the
Tennessee Valley. Valley fog has set in across eastern Kentucky
under mostly clear skies. Temperatures currently range from the
mid to upper 60s across the area.

A mid-level ridge of high pressure will expand northeast into the
Great Lakes region through the short term. This will keep above
normal temperatures as well as mostly clear skies in place across
eastern Kentucky. Highs today and Saturday will average in the mid
to upper 80s, with lows tonight in the 60 to 65 degree range.

.LONG TERM...(Saturday night through Thursday)
Issued at 349 AM EDT FRI SEP 22 2017

Surface high pressure will remain in place across eastern
Kentucky through much of the extended in conjunction with a weak
ridge of high pressure aloft. This will promote mostly clear and
calm conditions. Southerly flow in the mid and upper levels to
start out the extended period will also continue the trend of
above normal temps, with highs expected to be in the mid and upper
80s from Sunday through midweek. By Wednesday, winds will become
more northerly as heights begin to lower across the state as a
longwave troughing pattern moves towards the region. While
conditions will remain dry, this may help temps cool a couple
degrees or so compared to previous days.

On Thursday, a surface cold front is expected to approach and
traverse the CWA from the NW. This will bring an increase in
clouds, cooler temps in the upper 70s for the afternoon, and also
the potential for showers and thunderstorms. Unfortunately models
are not in good agreement with the extent of precip across the
region this far out in the forecast period, with the GFS bringing
a prefrontal band across the CWA Thursday afternoon and evening,
and the ECWMF shows the front dissolving with no precip affecting
the region. Given the uncertainties this far out, stuck with a
blend of the two, which keeps generally slight chance pops across
the CWA to finish out the forecast period.


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

Fog will bring LIFR or worse conditions to the river valleys
through 13z. Similar to last night, have hit SYM and SME the
hardest, with the ridges likely only seeing temporary MVFR
visibility restrictions at worst. VFR conditions will prevail
after 13z for the most locations, with some scattered cumulus
ranging from 3 to 5k feet agl developing during the day. Winds
will average less than 5 kts through the period.




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