Area Forecast Discussion
Issued by NWS Jackson, KY

Home | Current Version | Previous Version | Graphics & Text | 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
000
FXUS63 KJKL 192044
AFDJKL

AREA FORECAST DISCUSSION
National Weather Service Jackson KY
344 PM EST Sun Nov 19 2017

.SHORT TERM...(This evening through Monday night)
Issued at 344 PM EST SUN NOV 19 2017

A shortwave moving across the Ohio Valley this morning is currently
exiting to the east this afternoon. This has impacted the CWA,
keeping moisture in the form of low clouds across the region as well
as some sprinkles (and flurries in the highest terrain) throughout
the morning and early afternoon. As this shortwave continues to
shift eastward, expect these sprinkles/flurries to taper off over
the next few hours. Latest satellite imagery shows the back edge of
the llvl clouds now over central Kentucky nudging towards our CWA.
Expect clouds to begin clearing out late this afternoon and into the
evening from west to east.

As we head into the overnight, an area of surface high pressure will
begin nosing in from the SW, and should be located across the CWA by
12Z Monday. Winds will turn more SW as the system approaches, then
remain S to SW through the day Monday and into Monday night as it
slowly shifts eastward. Made adjustments to the valley winds and
temps, lowering them based on the decoupling that is likely to take
place with high pressure overhead, especially Monday night under the
more southerly flow. Meanwhile, southerly flow will help to boost
temps on Monday afternoon back to around 50 degrees in most
locations. Latest soundings show a very dry airmass in place across
the region with the incoming high, so expect mostly clear skies
throughout the remainder of the short term forecast period after
clearing clouds this evening. While a few patches of fog can`t be
ruled out in the most sheltered valleys, the overall likelihood of
fog is fairly low based on how dry the latest soundings are,
therefore kept out of forecast.

.LONG TERM...(Tuesday through Sunday)
Issued at 344 PM EST SUN NOV 19 2017

The period will be dominated by a general longwave trough over the
eastern CONUS, and periodic impulses rotating through to affect
the trough`s amplitude and position. At the surface, these
impulses are expected to support a cold front moving through our
area Tuesday night, another cold front which dies as it approaches
the Ohio Valley Thursday night, and a strong cold front expected
to pass through our area next weekend. No significant moisture
return is forecast ahead of the fronts. In the 12Z model runs,
the GFS does generate light precip over our northeast counties on
Saturday, and its ensemble mean shows light precip over our area
on Saturday into Saturday evening. Have allowed for a slight
chance of showers over our northeast counties in those periods,
with that being the only mention of precip during the long term
period.

For temps, a couple of brief mild spells are forecast in the warm
air advection immediately ahead of the cold fronts. Otherwise,
readings are expected to be near or below normal.

&&

.AVIATION...(For the 18Z TAFS through 18Z Monday afternoon)
ISSUED AT 107 PM EST SUN NOV 19 2017

BKN to OVC MVFR to low end VFR CIGS are still ongoing across
eastern Kentucky, though there is a defined back edge now moving
across western Kentucky. Expect CIGS to start clearing out during
the evening from southwest to northeast. Clear skies will then
stay in place through the remainder of the TAF period. Winds will
remain from the west to northwest throughout the rest of the day,
generally around 8 to 12 knots, though some isolated higher gusts
will be possible. Winds will then dissipate throughout the
evening and into the overnight, remaining under 10 knots through
tomorrow as well.

&&

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

$$

SHORT TERM...JMW
LONG TERM...HAL
AVIATION...JMW



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