Area Forecast Discussion
Issued by NWS Charleston, WV

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510
FXUS61 KRLX 160738
AFDRLX

Area Forecast Discussion
National Weather Service Charleston WV
238 AM EST Sat Dec 16 2017

.SYNOPSIS...
Weak upslope overnight. High pressure Saturday. A weak system
brings some light rain Sunday afternoon and night. Another
clipper crosses Tuesday.

&&

.NEAR TERM /THROUGH TODAY/...
As of 100 AM Saturday...

Forecast on track, with breaks in the cloud slowly encroaching
upon the middle Ohio Valley.

As of 1005 PM Friday...

Adjusted the temperatures during the overnight to keep them
largely steady, less a degree or two of variation. This ended up
with a slight upward adjustment to the Min T values tonight.

As of 110 PM Friday...

Some cold air advection behind an upper level wave will allow
for some weak upslope this evening in the northern WV mountains.
Moisture may become deep enough for some light snow showers. Due
to the limited moisture and weak nature of the upslope, think
any accumulations would remain less than in inch.

Temperatures tonight are once again rather tricky due to the
combination of some wind, a stratus deck that will be
dissipating, and some warm advection clouds.

Warm air advection sets in later tonight with high pressure
building over the area on Saturday.

&&

.SHORT TERM /TONIGHT THROUGH TUESDAY NIGHT/...
As of 230 AM Saturday...

Warmer, and overall drier weather this weekend. A shortwave will
move through the region on Sunday, creating a chance for
showers. As of now, based on timing of precipitation, have only
rain coded in the forecast, but any change in the timing, could
result in a brief wintry mix across the north on Sunday.
Otherwise, Monday is looking much drier, with another cold front
progged for Tuesday/Tuesday night as low pressure moves east
across Canada. This period is also looking to be drier, with
moisture from southern stream system remaining to our south, and
an overall lack of significant moisture from northern system.
Expecting just a chance of precipitation, mainly across the
higher terrain, with rain and snow showers Tuesday night behind
the front.

&&

.LONG TERM /WEDNESDAY THROUGH FRIDAY/...
As of 240 AM Saturday...

Unsettled weather for the long term period, with another cold
front slated for late in the period. Bulk of precipitation
during this period will fall as rain, although a transition to
light snow is possible for Friday night behind the front, but,
as often is the case, by the time enough cold air is in place,
moisture will be lacking. Lots of uncertainty exists for the
upcoming weekend and beyond but overall pattern looking quite
active.

&&

.AVIATION /08Z SATURDAY THROUGH WEDNESDAY/...
As of 100 AM Saturday...

Warm advection will gradually eradicate any snow showers along
higher ridges overnight, and the MVFR stratocu, from south to
north, overnight into early Saturday morning. The stratocu, up
around 4 kft otherwise, will gradually break up across the
lowlands overnight, and across the mountains early Saturday
morning.

High pressure will then bring VFR conditions for the balance of
the day Saturday, and Saturday night.

Westerly surface flow, gusty in the mountains, will gradually
diminish overnight, becoming light southwest for Saturday. Flow
aloft will be moderate west to northwest.

FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 06Z SUNDAY...

FORECAST CONFIDENCE: High.

ALTERNATE SCENARIOS: Snow showers could cause brief MVFR
visibility restrictions in the northern WV mountains overnight.
Timing of MVFR ceilings may vary into Saturday morning.

EXPERIMENTAL TABLE OF FLIGHT CATEGORY OBJECTIVELY SHOWS CONSISTENCY
OF WFO FORECAST TO AVAILABLE MODEL INFORMATION:
H = HIGH:   TAF CONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.
M = MEDIUM: TAF HAS VARYING LEVEL OF CONSISTENCY WITH MODELS.
L = LOW:    TAF INCONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.

DATE                                   SAT 12/16/17
UTC 1HRLY       06   07   08   09   10   11   12   13   14   15   16   17
EST 1HRLY       01   02   03   04   05   06   07   08   09   10   11   12
CRW CONSISTENCY  H    H    H    H    H    H    H    H    H    H    H    M
HTS CONSISTENCY  H    H    H    H    H    H    H    H    H    H    H    M
BKW CONSISTENCY  M    M    H    H    H    H    H    H    H    H    H    M
EKN CONSISTENCY  M    H    M    M    M    M    M    H    H    H    H    M
PKB CONSISTENCY  H    H    H    H    H    H    H    H    H    H    H    M
CKB CONSISTENCY  H    H    H    H    H    H    H    H    H    H    H    M

AFTER 06Z SUNDAY...
IFR in light rain and stratus at times Sunday night through Monday
night.

&&

.RLX WATCHES/WARNINGS/ADVISORIES...
WV...None.
OH...None.
KY...None.
VA...None.

&&

$$
SYNOPSIS...TRM/RPY/30
NEAR TERM...TRM/RPY/26
SHORT TERM...SL
LONG TERM...SL
AVIATION...TRM



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