Special Weather Statement, NWS Charleston, WV

Area Forecast Discussion
National Weather Service Charleston WV
1021 AM EDT Sat Mar 18 2017

.SYNOPSIS...
Cold front crosses today. Upper disturbance crosses today into
tonight as low pressure intensifies off the east coast. Another
system Monday into Tuesday. High pressure mid to late week.

&&

.NEAR TERM /THROUGH TONIGHT/...
As of 1020 AM Saturday...

Have some clearing coming through and reformation of showers
along the cold front pushing through the Kanawha Valley. Low
clouds headed back in later today from the northwest.

As of 300 AM Saturday...

WSW canceled as snowshoe has climbed steadily to 37F.

A cold front sweeping across the area today will eradicate the
low level moisture in place early this morning. Mid level dry
air will limit precipitation along the cold front although do
allow at least low PoPs anytime through midday as a flat wave
moving across may aid in squeezing precipitation out.

An upper level short wave crosses today as its parent low
passes north of the area. These lowering heights, along with
strengthening low level upslope flow out of the northwest, and
mid March insolation should result in numerous rain showers in
and near the mountains, and scattered showers dotting the
lowlands this afternoon.

Rain showers will turn to snow showers tonight, as progressively
colder air moves in. With the loss of daytime insolation, and
the upper level low moving off to the east, snow showers will
become increasingly confined to the mountains tonight, the
northwest upslope flow there being maintained with the help of
surface low pressure developing off the east coast, as the upper
level low digs southeastward into the middle Atlantic states.
Light accumulations are expected.

Not much change needed to temperatures and dew points with NAM
raw and MOS along with a short term consensus blended in.

&&

.SHORT TERM /SUNDAY THROUGH TUESDAY NIGHT/...
As of 300 AM Saturday...

Light upslope snow showers will gradually taper off on Sunday as
upper low moves off to the east, with a cooler northerly flow
setting up across the region. Some moderation in temperatures on
Monday as heights build in response to an approaching shortwave
trough and surface cold front, which will spread precipitation back
into the region by Monday evening. Frontal boundary will gradually
shift to the south on Tuesday, although there is still some
uncertainty in the timing, and how far south the front gets later in
the day. This could mean the difference between a dry forecast by
later in the day Tuesday for much of the CWA, or a chance of
showers, and possibly thunderstorms, particularly across the south.

&&

.LONG TERM /WEDNESDAY THROUGH FRIDAY/...
As of 300 AM Saturday...

Cool, dry high pressure for much of Wednesday and Thursday,
with low relative humidities expected. A stronger system moves
into the region towards the end of the period.

&&

.AVIATION /14Z SATURDAY THROUGH WEDNESDAY/...
As of 620 AM Saturday...

A weak cold front crossing the area early this morning
interrupted some of the fog and stratus. Daytime heating and
mixing this morning, and the main cold front crossing later this
morning, will result in improving conditions. Visibilities
should improve through MVFR to VFR by 14-16Z this morning, and
ceilings 16-19Z. Ceilings in and near the mountains are not
likely to improve to VFR for long if at all today.

As low pressure intensifies off the east coast later today and
tonight, northwest winds will increase and become gusty as
moderate west flow aloft becomes northwest. Rain showers will
develop, especially in and near the mountains, in the
increasing upslope northwest flow, and then change over to snow
showers tonight. This will bring conditions back down to MVFR or
lower in and near the mountains later this afternoon and
tonight, with MVFR stratocu likely elsewhere out across the
lowlands tonight.

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

FORECAST CONFIDENCE: Low to medium.

ALTERNATE SCENARIOS: Improvement from IFR conditions this
morning may vary. MVFR or worse conditions in rain showers this
afternoon, and then snow showers tonight, may vary, especially
in and near the mountains.

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    L    M    M    H    H    H    M    M    L
HTS CONSISTENCY  L    M    M    M    M    H    M    H    M    H    M    L
BKW CONSISTENCY  L    L    M    M    M    M    M    M    H    H    M    L
EKN CONSISTENCY  L    M    M    M    M    M    L    H    M    L    M    M
PKB CONSISTENCY  L    L    L    L    L    M    M    M    M    H    H    L
CKB CONSISTENCY  M    L    M    M    M    M    L    M    L    M    M    L

AFTER 12Z SUNDAY...
IFR possible Sunday morning in snow showers in the mountains.

&&

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

&&

SYNOPSIS...TRM/SL
NEAR TERM...TRM/26
SHORT TERM...SL
LONG TERM...SL
AVIATION...TRM

Hazardous Weather Outlook
National Weather Service Charleston WV
312 AM EDT Sat Mar 18 2017

KYZ101>103-105-OHZ066-067-075-076-083>087-VAZ003-004-WVZ005>011-
013>020-024>034-039-040-515>526-190715-
Greenup-Carter-Boyd-Lawrence KY-Perry-Morgan-Athens-Washington-
Jackson OH-Vinton-Meigs-Gallia-Lawrence OH-Dickenson-Buchanan-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-McDowell-Wyoming-Upshur-Barbour-
Northwest Raleigh-Southeast Raleigh-Northwest Fayette-
Southeast Fayette-Northwest Nicholas-Southeast Nicholas-
Northwest Webster-Southeast Webster-Northwest Pocahontas-
Southeast Pocahontas-Northwest Randolph-Southeast Randolph-
312 AM EDT Sat Mar 18 2017

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

.DAY ONE...Today and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

TRM

Special Weather Statement
National Weather Service Charleston WV
1229 PM EDT SAT MAR 18 2017

WVZ016-018-028-029-181700-
Calhoun-Roane-Gilmer-Braxton-
1229 PM EDT SAT MAR 18 2017

...A SHOWER with possible hail WILL AFFECT SOUTHERN
CALHOUN...SOUTHWESTERN GILMER...WEST CENTRAL BRAXTON AND CENTRAL
ROANE COUNTIES...

At 1228 PM EDT, a shower was located 8 miles southeast of Spencer,
moving east at 35 mph.

Dime size hail is possible with this shower. Occasional lightning
may also occur, so stay indoors.

Locations impacted include...
Arnoldsburg, Shock, Millstone, Orma, Looneyville, Rosedale, Nicut and
Chloe.

LAT...LON 3879 8095 3866 8091 3866 8102 3867 8103
      3866 8104 3865 8132 3868 8135 3872 8136
      3885 8110
TIME...MOT...LOC 1628Z 253DEG 32KT 3870 8128

cooper

Special Weather Statement
National Weather Service Charleston WV
1241 PM EDT SAT MAR 18 2017

WVZ008-014-016>018-181715-
Calhoun-Jackson-Roane-Wirt-Putnam-
1241 PM EDT SAT MAR 18 2017

...A LINE OF showers with hail possible WILL AFFECT CENTRAL
CALHOUN... NORTHEASTERN PUTNAM...SOUTH CENTRAL WIRT...NORTHWESTERN
ROANE AND SOUTHEASTERN JACKSON COUNTIES...

At 1240 PM EDT, radar indicated showers were located along a line
extending from 7 miles north of Spencer to near Kenna.
Movement was east at 30 mph.

Dime size hail and occasional lightning are possible with these
showers.

Locations impacted include...
Spencer, Grantsville, Kenna, Reedy, Statts Mills, Harmony,
Annamoriah, Kentuck, Gay and Gandeeville.

This includes Interstate 77 in West Virginia between mile markers 123
and 131.

LAT...LON 3894 8104 3878 8123 3863 8153 3865 8184
      3868 8179 3868 8178 3869 8178 3877 8165
      3894 8146
TIME...MOT...LOC 1640Z 262DEG 25KT 3892 8136 3876 8153 3865 8175

cooper

Special Weather Statement
National Weather Service Charleston WV
1257 PM EDT SAT MAR 18 2017

WVZ018-028-029-181730-
Calhoun-Gilmer-Braxton-
1257 PM EDT SAT MAR 18 2017

...A THUNDERSTORM WILL AFFECT SOUTHEASTERN CALHOUN... SOUTHWESTERN
GILMER AND NORTHWESTERN BRAXTON COUNTIES...

At 1256 PM EDT, a thunderstorm was located near Arnoldsburg, or 11
miles south of Grantsville, moving east at 35 mph.

Nickel size hail is possible with this storm.

Locations impacted include...
Shock, Exchange, Orma, Rosedale, Nicut and Cedarville.

LAT...LON 3870 8108 3872 8113 3878 8112 3889 8082
      3882 8073 3873 8074
TIME...MOT...LOC 1656Z 255DEG 31KT 3876 8103

cooper

Special Weather Statement
National Weather Service Charleston WV
108 PM EDT SAT MAR 18 2017

WVZ018-029-181730-
Calhoun-Gilmer-
108 PM EDT SAT MAR 18 2017

...A SHOWER with possible hail WILL AFFECT NORTHERN CALHOUN AND
NORTHWESTERN GILMER COUNTIES...

At 107 PM EDT, a shower was located near Grantsville, moving east at
30 mph.

Up to half inch hail is possible with this shower. Occasional
lightning may also occur, so remain indoors if you hear thunder.

Locations impacted include...
Glenville, Grantsville, Cedar Creek State Park, Big Springs, Tanner
and Mount Zion.

LAT...LON 3896 8084 3888 8085 3886 8100 3885 8122
      3887 8124 3888 8124 3889 8125 3891 8125
      3900 8110 3901 8103 3901 8100 3902 8099
      3903 8093
TIME...MOT...LOC 1707Z 263DEG 28KT 3888 8118

cooper

Special Weather Statement
National Weather Service Charleston WV
132 PM EDT SAT MAR 18 2017

WVZ013-015-027-028-519-521-181800-
Clay-Kanawha-Northwest Webster-Lincoln-Northwest Nicholas-Braxton-
132 PM EDT SAT MAR 18 2017

...AN AREA OF THUNDERSTORMS WILL AFFECT CENTRAL NICHOLAS...
KANAWHA...SOUTH CENTRAL BRAXTON...NORTHEASTERN LINCOLN...WEST
CENTRAL WEBSTER AND CLAY COUNTIES...

At 130 PM EDT, radar indicated thunderstorms either side of a line
extending from Clay to 7 miles southeast of Pinch to near
Spurlockville. Movement was east at 35 mph.

Pea size hail is possible with these storms.

Locations impacted include...
Charleston, Nitro, Summersville, Clay, Jefferson, South Charleston,
St. Albans, Dunbar, Montgomery, Chesapeake, Marmet, Belle, Clendenin,
Cedar Grove, East Bank, Glasgow, Pratt, Pinch, Glen and Institute.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 Interstate 79 between mile markers 1 and 20.
 Interstate 77 in West Virginia between mile markers 96 and 110.
 Interstate 64 in West Virginia between mile markers 48 and 57.
 West Virginia Turnpike between mile markers 83 and 95.
 Route 119 between mile markers 66 and 80.

LAT...LON 3845 8049 3830 8082 3822 8112 3824 8114
      3823 8119 3826 8123 3818 8132 3819 8165
      3822 8165 3822 8173 3821 8172 3829 8197
      3833 8192 3836 8191 3855 8144 3852 8127
      3853 8119 3856 8114 3858 8051
TIME...MOT...LOC 1730Z 269DEG 29KT 3844 8108 3834 8137 3822 8203

cooper

Special Weather Statement
National Weather Service Charleston WV
139 PM EDT SAT MAR 18 2017

WVZ028-030-181815-
Lewis-Braxton-
139 PM EDT SAT MAR 18 2017

...SMALL HAIL WILL AFFECT SOUTH CENTRAL LEWIS AND NORTHEASTERN
BRAXTON COUNTIES...

At 138 PM EDT, a shower was located 9 miles north of Sutton, moving
northeast at 30 mph.

Half inch hail is possible with this shower.

Locations impacted include...
Heaters, Walkersville, Ireland and Falls Mills.

This includes Interstate 79 between mile markers 71 and 76.

LAT...LON 3878 8041 3874 8071 3880 8074 3891 8044
      3881 8040
TIME...MOT...LOC 1738Z 258DEG 26KT 3879 8066

30