809
FXUS61 KRLX 071845
AFDRLX

AREA FORECAST DISCUSSION
National Weather Service Charleston WV
245 PM EDT Sun Jul 7 2024

.SYNOPSIS...
High pressure brings a dry finish to the weekend. Increasing
southwesterly flow yields building heat and humidity for Monday
and Tuesday. Better rain chances mid-week with Beryl remnants.

&&

.NEAR TERM /THROUGH MONDAY/...
As of 230 PM Sunday...

Overall should be a calm and clear near-term period across the
bulk of the area. Some convection is starting to fire along the
VA/NC border, but current trajectories have that staying SE of
our CWA. However, some hi-res guidance does suggest some shower
or storm potential right along the border, so some low-end POPs
were introduced on the border near and SW of Beckley this
afternoon. Otherwise, some valley fog is expected again tonight,
but probably not quite as extensive as last night. Overnight
temps should drop into the 60s for most. Hot and partly to
mostly sunny tomorrow, with lower elevation highs in the low to
mid-90s, and upper 70s to 80s in the higher terrain. The light
S`ly flow should help bring the moisture east of the mountains
up to the border, and so tomorrow afternoon we have chance POPs
along the entire eastern border of the CWA. Fortunately, though
dew points should be a bit higher than today, it looks like
there should be enough dry air mixing down to keep heat index
values under 100F, thus no Heat Advisory was contemplated at
this time.

&&


.SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY/...
As of 155 PM Sunday...

Tuesday will be another hot and humid day with heat index values
approaching triple digits. Will need to keep an eye on potential for
a heat advisory for at least a portion of the lower elevations.
Despite rather poor mid-level lapse rates could see isolated
diurnally enhanced convection with the best chances closer to the
higher terrain Tuesday afternoon. Mid-level troughing in the
northern stream approaches the Middle Ohio Valley Tuesday night as
moisture from the remnants of Beryl begins to move into the region.
This should yield increased chances for showers and storms much of
the day Wednesday into Wednesday night. There is still some
uncertainty as to exactly when the enhanced moisture arrives and at
least some models depict unrestricted insolation early in the day
while others temper warming with ample cloud cover. Will need to
keep an eye on potential for some stronger storms with deep layer
shear around 30KTs if better early insolation is realized. Better
synoptic forcing is expected to remain west of us with better
chances for sustained efficient rainfall, but will still need to
monitor for localized water issues with storm motions out of the
southwest at only 15-20KTs with deep warm cloud depths and
precipitable water values approaching 2 inches.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...
As of 155 PM Sunday...

The northern stream frontal position forecast gets muddled by the
extra tropical low, but should eventually see frontal passage
sometime Wednesday night into Thursday morning. Models have trended
drier in the wake of frontal passage with tropical moisture
remaining largely confined to the Atlantic Coastal Plain for the end
of the week. This should yield decreasing chances for diurnal
convection, with most, if not all activity confined to the higher
terrain in diurnal upslope.

&&

.AVIATION /19Z SUNDAY THROUGH FRIDAY/...
As of 125 PM Sunday...

VFR conditions should prevail through the period, outside of any
valley fog that forms tonight. Valley fog isn`t expected to be
quite as widespread as last night, thanks to having another day
of drying after the last rains. Elkins is the most likely to see
denser fog, and they are brought down hard for a couple hours
just before sunrise. Patchy fog could also impact CKB and CRW,
and a few hours of MVFR was put into those sites as a signal.

FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 18Z MONDAY...

FORECAST CONFIDENCE: Medium for fog impacts; high otherwise.

ALTERNATE SCENARIOS: Timing and extent of dense fog development
overnight tonight could vary from the 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
EDT 1HRLY       14   15   16   17   18   19   20   21   22   23   00   01
CRW CONSISTENCY  H    H    H    H    H    H    H    H    H    H    H    H
HTS CONSISTENCY  H    H    H    H    H    H    H    H    H    H    H    H
BKW CONSISTENCY  H    H    H    H    H    H    H    H    H    H    H    H
EKN CONSISTENCY  H    H    H    H    H    H    H    H    H    H    H    H
PKB CONSISTENCY  H    H    H    H    H    H    H    H    H    H    H    H
CKB CONSISTENCY  H    H    H    H    H    H    H    H    H    H    H    H

AFTER 18Z MONDAY...
Brief IFR possible in and near thunderstorms Wednesday.

&&

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

&&

$$

SYNOPSIS...FK/JP
NEAR TERM...FK
SHORT TERM...JP
LONG TERM...JP
AVIATION...FK