Area Forecast Discussion
Issued by NWS Charleston, WV

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000
FXUS61 KRLX 220242
AFDRLX

Area Forecast Discussion
National Weather Service Charleston WV
940 PM EST Sat Jan 21 2017

.SYNOPSIS...
Unseasonably warm into the beginning of next week. Upper trough
moves overhead Sunday. Stronger upper low Sunday night and
Monday, exiting Tuesday.

&&

.NEAR TERM /UNTIL 9 AM SUNDAY MORNING/...
As of 940 PM Saturday...

An area of rain has developed over northeastern KY and is moving
northeastward. Have updated the forecast to account for this area.
Have also delayed the arrival of precipitation Sunday morning based
on the latest models.


As of 210 PM Saturday...

Unseasonably warm temperatures continue today and through
Sunday. Even with mid and upper level clouds overspreading the
region we have still seen widespread temperatures in the low to
mid 60s. Generally, most of the area will remain dry through
tonight as short wave passes just to our east. However, model
guidance is still uncertain with meso guidance bringing
measurable precip across the entire CWA, while the NAM, GFS, and
ECMWF keep QPF along the Eastern Mountains. Current thinking is
that the decent mid level instability is making meso models
overdo QPF amounts. Based on forecast soundings it is very dry
below 10K feet so likely we will see some very light rain or
sprinkles in the Ohio Valley and the Lowlands as most of the
returns currently on Radar is falling as VIRGA.

I have kept some slight chance PoP in the Lowlands, but
expecting very little in the way of any rainfall. Low level
moisture is a little more intact across the Eastern Mountains
and have left chance PoP here, but again the bulk of the forcing
is to our east and any measurable rainfall is likely to hug our
border with Blacksburg`s CWA.

Another stronger upper trough ahead of the closed upper low
will lift over our region tomorrow and likely spread showers
from south to north starting late in the morning. Guidance is in
fairly good agreement with having this first wave through the
area in the afternoon with a lull in the action before the more
robust closed low arrives late tomorrow night.

&&

.SHORT TERM /9 AM SUNDAY MORNING THROUGH TUESDAY/...
As of 220 PM Saturday...

A deep and strong mid latitude cyclone will cross south of the area
Monday night into Tuesday. The consensus among synoptic models
suggest the sfc low will cross the area west to east. The further
south the trajectory of its center, more colder air will move in and
the better probability to produce snow. With the current trajectory,
even when ice will be present aloft, temperatures at H850 and
sfc don`t cool down to below freezing. Therefore, kept liquid
PCPN Sunday night into Monday. Once the parent low move east of
the Appalachians, colder air in the back slash of the cyclone
will allow for snow showers over the higher elevations northeast
mountains Monday night into Tuesday.

Confidence runs high allowing likely to categorical PoPs Sunday
night and Monday.

The flow remains from the north Tuesday bringing drier and
fresh temperatures through mid week.

&&

.LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/...
As of 220 PM Saturday...

By wednesday, the flow turns southeast ahead of an approaching
new low pressure system across the Great lakes with frontal
boundaries affecting the area. This system will bring much
colder air evident in H850 temperatures reaching minus 7
Thursday night. Sfc temperatures will drop below freezing
allowing liquid PCPN to transition to all snow Thursday night
and Friday.

&&

.AVIATION /03Z SUNDAY THROUGH THURSDAY/...
As of 600 PM Saturday...

An upper level disturbance will lift northward across the area this
evening. While some brief light rain is possible, generally VFR
conditions will prevail.

Big question for later tonight is whether valley fog will form or
not. This depend on mid deck clearing. With more moisture in the
atmosphere than previous nights, confidence about fog is low. Right
now thinking some late fog possible in the mountains and over
northern WV.

With southeast winds developing later tonight and remain on Sunday,
expect some IFR conditions on the southeast upslope side of the
mountains.

A band of showers will push northward across the area on Sunday.
Outside of this band and the southeast upslope, generally VFR
conditions will prevail. Expect some MVFR restrictions as the band
of showers moves through.

FORECAST CONFIDENCE: High, except low with fog and medium with
southeast upslope clouds.

ALTERNATE SCENARIOS: Fog may or may not form late tonight. Timing
and location of southeast upslope clouds late tonight could vary.

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                                                  SUN 01/22/17
UTC 1HRLY       03   04   05   06   07   08   09   10   11   12   13   14
EST 1HRLY       22   23   00   01   02   03   04   05   06   07   08   09
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  H    H    H    L    H    M    M    M    M    M    M    L
EKN CONSISTENCY  H    H    H    H    H    M    L    L    L    L    L    L
PKB CONSISTENCY  H    H    H    H    H    H    M    L    L    L    H    M
CKB CONSISTENCY  H    H    H    H    H    H    H    M    L    L    M    M

AFTER 00Z MONDAY...

&&

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

&&

$$
SYNOPSIS...ARJ/MPK
NEAR TERM...RPY/MPK
SHORT TERM...ARJ
LONG TERM...ARJ
AVIATION...RPY



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