850 
FXUS61 KRLX 201907
AFDRLX

Area Forecast Discussion
National Weather Service Charleston WV
207 PM EST Fri Jan 20 2017

.SYNOPSIS...
Active weather continues later this weekend as strong closed 
low passes just to the southwest. Brief high pressure builds in 
behind it midweek before another colder system passes towards
the end of next week.   

&&

.NEAR TERM /THROUGH SATURDAY/...

As of 210 PM Friday...

Warm air has surged into the region behind a warm front that
passed earlier today. Temperatures have already reached the low
60s across the Southern half of the forecast area. Although it
remains mostly cloudy this afternoon, there are some breaks in 
the clouds and areas that see any persistent sunshine could
climb into the upper 60s. 

Forecast soundings indicate enough low level moisture lingers
tonight for mostly cloudy skies to persist. This will also keep
us quite mild overnight with lows generally in the low 50s to
upper 40s. With the saturated ground, it is possible that we see
some fog develop by early Saturday morning, but this will depend
on cloud cover.  

Weak overrunning starts again tomorrow afternoon. Right now the
current thinking is that precipitation will likely hold off
until after 00Z, but have added some slight chance to low chance
PoP across the Southern forecast area tomorrow evening.  

&&

.SHORT TERM /SATURDAY NIGHT THROUGH SUNDAY NIGHT/...
As of 315 AM Friday...

5h ridge axis shifts east of the forecast area on Saturday with
slight drying trend to start the period. Then flow trajectories
shift more toward the southwest as another warm front surges 
north with over running precipitation. Atmospheric dynamics 
weak, and will carry general chance pops and lighter qpf amounts
into saturday night. 

Longwave trough axis then starts a trend to shift eastward late in 
the period, perpetuated by a decent piece of energy working along 
the southern periphery across the Tennessee Valley. Models tend to 
keep best dynamics and moisture across southern half of our forecast 
area with sfc low passing across NC.   

Temps will remain well above normal through the period, with all 
precipitation falling as rain through Sunday night.  There even be a 
few lighting strokes Sunday afternoon.

&&

.LONG TERM /MONDAY THROUGH FRIDAY/...
As of 315 AM Friday...

Surface low tracks across to our south and then rides northward up 
the East Coast with Mid Atlantic region remaining in a warm airmass. 
Late in the period we see further indication that a change in 
the longwave pattern is afoot, with cooler airmass working its 
way into the upper midwest. By Thursday, we should see 
temperatures return to more seasonal values. Noted some 
variation with model solutions regarding the extended period. 
Thus, used a general model blend throughout the period with a 
few minor tweaks to pop and temperature values.

&&

.AVIATION /19Z FRIDAY THROUGH WEDNESDAY/...
As of 1250 PM Friday...

A warm front has pushed through the region. Behind the front
there is generally broken clouds as ceilings range from VFR to
MVFR. Ceilings should continue to increase through the afternoon
as we become firmly entrenched in the warm sector. Isolated 
showers will be possibly this afternoon across Northeast West 
Virginia, but for the most part we will continue to dry out. 

Confidence in the forecast starts to drop later tonight. There
will remain breaks in the clouds and with low level moisture in
place there is a chance that we could see some fog develop. Some
sites could possibly drop to IFR conditions.  

FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 18Z SATURDAY...
     
FORECAST CONFIDENCE: Medium. 
   
ALTERNATE SCENARIOS: With broken clouds ceilings will likely
drop to MVFR at times.  Fog development tonight may be more 
widespread than forecast.

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.

UTC 1HRLY       18   19   20   21   22   23   00   01   02   03   04   05
EST 1HRLY       13   14   15   16   17   18   19   20   21   22   23   00
CRW CONSISTENCY  H    H    H    L    H    H    H    H    H    H    H    M
HTS CONSISTENCY  H    H    H    M    L    H    H    H    M    M    M    L
BKW CONSISTENCY  M    M    H    H    H    H    H    H    H    H    H    M
EKN CONSISTENCY  H    H    H    L    H    H    H    H    H    H    H    L
PKB CONSISTENCY  M    H    L    M    L    L    L    L    L    L    M    L
CKB CONSISTENCY  H    M    H    H    H    L    H    H    H    H    M    L

AFTER 18Z SATURDAY...
IFR will be possible again Sunday through Monday with another 
system.

&&

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

&&

$$
SYNOPSIS...TRM/MPK
NEAR TERM...MPK
SHORT TERM...TRM
LONG TERM...TRM
AVIATION...MPK