Special Weather Statement, NWS Charleston, WV

AREA FORECAST DISCUSSION
National Weather Service Charleston WV
915 AM EDT Wed Jun 30 2021

.SYNOPSIS...
Increasing shower/thunderstorm chances today as high pressure
fades. Cold front passes through with heavy rain Thursday into
Thursday night. High pressure returns for the weekend.

&&

.NEAR TERM /THROUGH TONIGHT/...
As of 910 AM Wednesday...

Made some further refinements to PoPs and temperatures for today
based on latest guidance and observed trends. SPC has added
portions of SE OH and N WV to a slight risk for severe
thunderstorms this afternoon and evening. Deep layer shear is
generally at or below 20KTs, so some transient organization of
updrafts would be possible, but mainly a pulse type storm mode
is expected with potential localized gusty winds with core
drops.

As of 705 AM Wednesday...

Added in a mention of isolated showers from Lawrence County KY
to Kanawha County for a few hours this morning. Weak H850
convergence is supporting a few elevated showers for these
locations. They should dissipate over the next couple hours as
they drift east.

As of 245 AM Wednesday...

Just your typical average summer day, only difference is we
have a broad frontal boundary draped across the Great Lakes,
and its coming for the area in the near future. There seems to
be a boundary or trough ahead of the front which will help
promote thunderstorms across the Ohio River and north of there
today. This combined with more moisture in the column and high
pressure pulling back will help aid in the development of area-
wide convection by the afternoon as this feature makes its way
south into the CWA. Most Hi-res models support scattered
activity and there is a threat of severe storms on top of that
as well for a good portion of the area.

Forecast soundings look ripe for possible strong to severe cells
and supports our marginal for severe coverage by SPC today.
Plenty of instability available, more moisture and less
subsidence aloft than yesterday. PWATs are close to 2 inches and
Dcape values are high, although not as high as yesterday, but
still capable of promoting heavy downpours or downbursts in
pulse type storms. The main threat is strong wind with a close
second of localized flash flooding under heavy downpours,
especially near low lying or flood prone areas or areas that get
hit repeatedly.

The rainfall we get today will prime the area for Thursday
which is likely a good time for a flash flood watch. In
collaboration with neighbors today, I decided to hold off on
issuing anything for tonight since the threat is more localized
since we have been fairly dry, and are not expecting a whole
lot of activity today. The significant amount of rainfall will
be associated with frontal passage. The neighbors all agreed on
holding off with the watch for now. We have been placed in an
marginal threat for excessive rainfall by WPC for a good
portion of the CWA as well as a portion of our OH counties
under a slight risk. Will place mention of all this in the HWO.

Shower chances will remain elevated, however will take a slight
dip later this evening, but will ramp up in anticipation of
the rain shield ahead of the cold front scheduled to approach
just outside our CWA to the northwest by Thursday morning.
Accepted guidance for temperatures today which has the area
reaching into the mid to upper 80's, slightly cooler in the
higher elevations. These may be subdued by a few degrees
depending on the cloud coverage and convection that arises over
the area this afternoon.

&&

.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...
As of 312 AM Wednesday...

There remains a consistent signal for a heavy rainfall and
flash flood threat on Thursday into Thursday evening as a cold
front works into the region with a very moist airmass in place
in advance of the front. In fact, according to SPC Sounding
Climatology, PWATS on Thursday may set a record at ILN with
models clustered around 2 inches. Multiple clusters of showers
and thunderstorms will likely affect the region throughout the
day, sinking southeastward through time into the overnight
hours. Aside from some very localized heavy rainfall the past
couple of days, most locations are pretty dry. It’ll be
interesting to see what falls and where it falls today as
rainfall today primes the ground for what comes Thursday and may
determine whether the flash flood threat is localized or more
widespread. For now, WPC continues to highlight the region with
a slight risk of excessive rainfall and we will continue to
play up those concerns in our messaging.

Thunder potential Thursday is uncertain as cloud cover and
precipitation should limit the instability. Should the front
slow some, I could see the opportunity for our southeastern
counties to destabilize increasing the potential that a few
stronger storms could develop. However, SPC keeps the marginal
risk confined to the northern Greenbrier Valley and points east
for Day 3 at this time.

The overall trend with this forecast package is then for a
quicker exit to the widespread precipitation Thursday night into
Friday as the front is now expected to push to our east and
just some lingering showers are expected behind the front during
the day.

Temperatures will be held down by clouds and rain on Thursday,
remaining in the 70s for most locations, and then remain in the
70s on Friday even with some sunshine breaking through by
afternoon. Dewpoints will also drop into the refreshing 50s on
Friday, setting up for a cool night Friday night with lows in
the 50s.

&&

.LONG TERM /SATURDAY THROUGH TUESDAY/...
As of 312 AM Wednesday...

The overall trend in the modeling is for a better looking
holiday weekend as the upper low which appeared to want to
settle overhead when looking at the models last night, now
appears to move off to our northeast while being replaced
quickly by a ridge of high pressure. While a few showers and
perhaps a thunderstorm or two cannot be ruled out Saturday or
Sunday, the bulk of the area should be dry with comfortable
temperatures and humidity levels. Temps and humidity then
increase Monday through Wednesday with a small threat for a
shower or thunderstorm.

&&

.AVIATION /13Z WEDNESDAY THROUGH SUNDAY/...
As of 640 AM Wednesday...

VFR conditions should flourish through most of the period with
the exception of possible VIS restrictions under a heavier
shower during the afternoon into the evening. Terminals should
see some rain showers for the afternoon, starting fairly late,
however not thinking VIS will be affected that much unless under
a heavier shower. Have inserted VCTS since probability is
higher than yesterday for the early or late afternoon or both
depending on the terminals location. Should see a decent
StratoCu/Cu field this afternoon as clouds become more dominate
and storms flare up with a slight rise in cloud heights for the
evening. Though we may see a break from showers and lower CIGs,
dont be fooled, this is only temporary as conditions worsen by
late evening, CIGs lower and VIS starts to decrease as well as
more rain encompasses the area ahead of a cold front. Winds will
stay steady today with light southerly flow until the afternoon
at which point they take a turn out of the west with gusts up
to 15KT. Greater gusts expected under any storms that may
develop.

FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 12Z THURSDAY...

FORECAST CONFIDENCE: Medium to high.

ALTERNATE SCENARIOS: Timing of VCTS may vary slightly from TAFs
depending on when storms flare up. VIS may deteriorate worse
than in TAFs under a shower that is moderate or worse.

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       12   13   14   15   16   17   18   19   20   21   22   23
EDT 1HRLY       08   09   10   11   12   13   14   15   16   17   18   19
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 12Z THURSDAY...
IFR possible with a slow moving frontal boundary Thursday into Friday
and possibly for Saturday depending on post frontal stratus
and/or fog potential.

&&

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

&&

SYNOPSIS...ABE/JZ
NEAR TERM...JP/JZ
SHORT TERM...ABE
LONG TERM...ABE
AVIATION...JZ

Hazardous Weather Outlook
National Weather Service Charleston WV
639 AM EDT Wed Jun 30 2021

KYZ101>103-105-OHZ066-067-075-076-083>087-WVZ005>011-013>020-024>032-
039-040-519-521>526-011045-
Greenup-Carter-Boyd-Lawrence KY-Perry-Morgan-Athens-Washington-
Jackson OH-Vinton-Meigs-Gallia-Lawrence OH-Wayne-Cabell-Mason-
Jackson WV-Wood-Pleasants-Tyler-Lincoln-Putnam-Kanawha-Roane-Wirt-
Calhoun-Ritchie-Doddridge-Mingo-Logan-Boone-Clay-Braxton-Gilmer-
Lewis-Harrison-Taylor-Upshur-Barbour-Northwest Nicholas-
Northwest Webster-Southeast Webster-Northwest Pocahontas-
Southeast Pocahontas-Northwest Randolph-Southeast Randolph-
639 AM EDT Wed Jun 30 2021

This Hazardous Weather Outlook is for northeast Kentucky, southeast
Ohio and much of West Virginia.

.DAY ONE...Today and Tonight.

There is a marginal risk of severe storms. We are anticipating
scattered to numerous thunderstorms this afternoon and evening, some
of which could become strong to severe. The main threat is strong
damaging wind. A close second threat is flash flooding, especially
for areas that are low lying or have poor drainage or just get hit
repeatedly by downpours. These areas are also in a marginal to
slight
risk for excessive rainfall.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Multiple rounds of showers and thunderstorms will affect the area
Thursday into Thursday night as a cold front works slowly through
the region. Excessive rainfall is possible, which may lead to
instances of flash flooding.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions by calling the toll-free spotter hotline, or by other
methods detailed at www.weather.gov/rlx/reports.

VAZ003-004-WVZ033-034-515>518-520-011045-
Dickenson-Buchanan-McDowell-Wyoming-Northwest Raleigh-
Southeast Raleigh-Northwest Fayette-Southeast Fayette-
Southeast Nicholas-
639 AM EDT Wed Jun 30 2021

This Hazardous Weather Outlook is for southwest Virginia, and
portions of southeast West Virginia and southern West Virginia.

.DAY ONE...Today and Tonight.

Scattered to numerous thunderstorms are anticipated this afternoon
and evening, some of which could become strong to possibly severe.
The main threat is strong damaging wind. A close second threat is
flash flooding, especially for areas that are low lying or have poor
drainage or just get hit repeatedly by downpours.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Multiple rounds of showers and thunderstorms will affect the area
Thursday into Thursday night as a cold front works slowly through
the region. Excessive rainfall is possible, which may lead to
instances of flash flooding.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions by calling the toll-free spotter hotline, or by other
methods detailed at www.weather.gov/rlx/reports.

Special Weather Statement
National Weather Service Charleston WV
1205 PM EDT Wed Jun 30 2021

WVZ013-015-026-301630-
Boone-Kanawha-Lincoln-
1205 PM EDT Wed Jun 30 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN KANAWHA...
NORTHEASTERN LINCOLN AND NORTH CENTRAL BOONE COUNTIES...

At 1205 PM EDT, a strong thunderstorm was located near Alum Creek, or
9 miles southwest of Charleston, moving northeast at 15 mph.

Winds in excess of 40 mph are possible with this storm.

Locations impacted include...
Charleston, Jefferson, South Charleston, St. Albans, Dunbar,
Sissonville, Chesapeake, Marmet, Belle, Alum Creek, Institute, Coal
Fork, Tornado and Ashford.

This includes the following highways...
 Interstate 79 between mile markers 1 and 3.
 Interstate 77 in West Virginia between mile markers 96 and 111.
 Interstate 64 in West Virginia between mile markers 50 and 57.
 West Virginia Turnpike between mile markers 88 and 95.
 Route 119 between mile markers 63 and 80.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 3815 8179 3830 8190 3848 8164 3824 8146
TIME...MOT...LOC 1605Z 239DEG 12KT 3827 8177

09

Special Weather Statement
National Weather Service Charleston WV
1224 PM EDT Wed Jun 30 2021

OHZ066-067-075-301700-
Athens-Morgan-Perry-
1224 PM EDT Wed Jun 30 2021

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN PERRY...NORTHERN
MORGAN AND NORTHERN ATHENS COUNTIES...

At 1224 PM EDT, a strong thunderstorm was located 8 miles west of
McConnelsville, moving northeast at 35 mph.

Winds in excess of 30 mph are possible with this storm.

Locations impacted include...
Glouster, McConnelsville, Malta, Corning, Bristol, Hemlock,
Rendville, Eagleport and Burr Oak State Park.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 3976 8165 3975 8164 3969 8164 3950 8210
      3965 8219 3977 8200
TIME...MOT...LOC 1624Z 243DEG 32KT 3963 8200

19

Special Weather Statement
National Weather Service Charleston WV
1255 PM EDT Wed Jun 30 2021

WVZ030-039-040-301730-
Barbour-Upshur-Lewis-
1255 PM EDT Wed Jun 30 2021

...A STRONG THUNDERSTORM WILL AFFECT EAST CENTRAL LEWIS...NORTHERN
UPSHUR AND WEST CENTRAL BARBOUR COUNTIES...

At 1255 PM EDT, a strong thunderstorm was located near Stonewall
Jackson, or 7 miles southeast of Weston, moving east at 25 mph.

Winds in excess of 30 mph are possible with this storm.

Locations impacted include...
Buckhannon, Overhill, Century, Hodgesville, Horner and Lorentz.

This includes the following highways...
 Interstate 79 near mile marker 98.
 Route 33 between mile markers 1 and 17.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 3894 8009 3890 8044 3900 8048 3914 8017
      3894 8008
TIME...MOT...LOC 1655Z 255DEG 22KT 3896 8039

19

Special Weather Statement
National Weather Service Charleston WV
104 PM EDT Wed Jun 30 2021

OHZ067-301730-
Morgan-
104 PM EDT Wed Jun 30 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN MORGAN COUNTY...

At 104 PM EDT, a strong thunderstorm was located 7 miles west of
Caldwell, moving east at 45 mph.

Winds in excess of 30 mph are possible with this storm.

Locations impacted include...
Bristol.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 3976 8183 3975 8164 3969 8164 3967 8178
      3976 8186
TIME...MOT...LOC 1704Z 252DEG 38KT 3973 8165

19

Special Weather Statement
National Weather Service Charleston WV
131 PM EDT Wed Jun 30 2021

OHZ085-301800-
Meigs-
131 PM EDT Wed Jun 30 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN MEIGS COUNTY...

At 130 PM EDT, a strong thunderstorm was located near New Haven, or
near Pomeroy, moving northeast at 15 mph.

Winds in excess of 30 mph are possible with this storm.

Locations impacted include...
Forked Run State Park, Tuppers Plains, Chester, Syracuse and
Reedsville.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 3915 8174 3910 8175 3908 8177 3908 8181
      3906 8181 3904 8179 3899 8193 3902 8199
      3911 8202 3918 8181 3918 8176
TIME...MOT...LOC 1730Z 242DEG 15KT 3906 8194

19

Special Weather Statement
National Weather Service Charleston WV
138 PM EDT Wed Jun 30 2021

OHZ075-076-WVZ009-010-301800-
Washington-Athens-Wood-Pleasants-
138 PM EDT Wed Jun 30 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHWESTERN
WASHINGTON...SOUTHEASTERN ATHENS...WEST CENTRAL PLEASANTS AND
NORTHERN WOOD COUNTIES...

At 137 PM EDT, radar indicated a line of strong thunderstorms were
located extending from near Marietta to Vienna to near Lubeck.
Movement was east at 25 mph.

Wind gusts up to 50 mph and pea size hail are possible with these
storms.

Locations impacted include...
Parkersburg, Marietta, Belpre, Vienna, Williamstown, Washington,
Boaz, Lubeck, North Hills, Little Hocking, Waverly, Fleming and
Blennerhassett.

This includes the following highways...
 Interstate 77 in West Virginia between mile markers 173 and 186.
 Interstate 77 in Ohio between mile markers 1 and 3.
 Route 50 in West Virginia between mile markers 1 and 17.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 3949 8133 3938 8131 3925 8135 3918 8178
      3930 8175 3938 8170
TIME...MOT...LOC 1737Z 248DEG 26KT 3943 8152 3933 8155 3918 8165

19