922 
FXUS63 KJKL 011255 CCA
AFDJKL

AREA FORECAST DISCUSSION...CORRECTED
National Weather Service Jackson KY
755 AM EST Fri Feb 1 2019

.UPDATE...
Issued at 651 AM EST FRI FEB 1 2019

The forecast is looking pretty good so far this morning. Due to
dry air in the lower atmosphere, precipitation has been having
difficulty reaching the ground for the past couple of hours. A few
locations have begun to see snow flurries or very light precip so
far today. Over the next hour or two the surface layer should
continue to saturate, allowing measurable precipitation to finally
reach the ground. Road surface temperatures will remain cold
enough for slick spots to form once ample amounts of snow or
freezing rain/drizzle begin accumulating. The latest obs were 
ingested into the hourly forecast grids to establish new trends.

&&

.SHORT TERM...(Today through Saturday)
Issued at 315 AM EST FRI FEB 1 2019

The primary concern in the short term remains the potential for a
wintry mix of precipitation across most of the area this morning
and the potential for slick roads throughout the day. The primary
threat for freezing rain will still be along and north of the
Mountain Parkway through mid to late this morning. However, with
road temperatures expected to lag behind air temperatures, there
will also be the potential for freezing rain to occur into the
afternoon and evening hours for some locations, especially in our
deeper and more sheltered eastern valley's, where the cold air 
that is currently in place may take much longer to scour out than 
other areas to the west and southwest of there. As such we will be
leaving our winter weather advisory virtually unchanged. Areas 
along and north of I64 will have the best chance of freezing rain 
and snow early this morning, with isolated areas perhaps seeing 
freezing rain and a bit of snow south of the Mountain Parkway. 
With road temperatures across most of the area expected to remain 
at or below freezing, slick roads will be the primary impact. 
Bridges and overpasses, and any untreated roads, will be most 
prone to icy spots during the morning commute. The models are in 
decent agreement with the timing and evolution precipitation 
today, so the forecast overall is not going to be much different 
than what the day shift issued yesterday. Precipitation will 
gradually transition from a wintry mix this morning, to all rain 
or mostly rain by this afternoon. We could see a few snow flurries
on the back edge of the departing area of precipitation this 
evening, but those should not have any impacts. The main concern 
will be the potential for freezing rain, snow and slick roads this
morning, and then lingering isolated patches of freezing rain 
this afternoon in our eastern areas where the roads may take much 
longer to warm above freezing.

The last precipitation should be exiting the area early this
evening, and will give way to mostly cloudy skies and much warm
temperatures. Lows across eastern Kentucky should be mainly in the
30s by Saturday morning. Todays highs will range from the upper
30s to lower 40s for most of the area. An even bigger warm up is
on tap for the weekend, as persistent southerly flow will be
established. We could see highs on Saturday in the mid to upper
50s for most locations. A few spots along the Tennessee border may
even reach 60 degrees tomorrow afternoon.

.LONG TERM...(Saturday night through Thursday) 
Issued at 721 AM EST FRI FEB 1 2019

The period should start quietly, with surface high pressure just
to our east and low level warm air advection ongoing. A weak
mid/upper level wave is expected to pass to our south during the
weekend, and it looks like any precipitation associated with it
will remain to our south. Our next shot at inclement weather is
not until late Monday into Tuesday. The responsible system is
still off the west coast and should start moving onshore today.
As the upper level system crosses the Rockies, it will support
surface low development over the Central Plains, with a deep low
then moving northeast over the Upper Great Lakes by Monday
evening. A trailing cold front will move west to east through KY
Monday night. Gulf moisture flowing north along and ahead of the
front may bring rain for our area. The upper level wave will be
rather weak this far south, and it will be fast moving. This keeps
the POP in the chance category. 

Another upper level wave currently over western Canada will be our
next player in the mid to late week time frame. As it drops south,
it is expected to set up an upper level pattern of swift flow 
with a long west southwesterly fetch for our area. The 
aforementioned front should move back north to KY. Low level flow 
lifting north off the Gulf and impinging on the front should 
result in rain for our area. Models still show a lot of of 
variation in the system as it evolves, but all point toward 
active, wet weather. The notable differences between the ECMWF 
and GFS include the GFS being heavier with rain (possibly flooding
rains late week), and the ECMWF being much more aggressive at 
bringing in cold air to end the week. There is potential for 
forecast busts until the models can come into better agreement.

&&

.AVIATION...(For the 12Z TAFS through 12Z Saturday morning)
ISSUED AT 651 AM EST FRI FEB 1 2019

VFR conditions at the TAF sites will gradually deteriorate to
MVFR, or even IFR in a few instances, as a wintry mix of
precipitation moves across the area this morning. The
precipitation should be at its peak coverage between 14 and 22Z 
before rapidly tapering off and exiting the area early this 
evening. Freezing rain and snow will make for slick runways and 
icing of aircraft, especially through 16Z today. Light southerly 
winds will prevail through the end of the period.

&&

.JKL WATCHES/WARNINGS/ADVISORIES...
Winter Weather Advisory until 10 AM EST this morning for KYZ044-
050>052-058>060-068-069-079-080-104-106-108-111-112-114>117.

Winter Weather Advisory until 7 PM EST this evening for KYZ107-
109-110-113-118>120.

&&

$$

UPDATE...AR
SHORT TERM...AR
LONG TERM...HAL
AVIATION...AR