Special Weather Statement, NWS Blacksburg, VA

Area Forecast Discussion
National Weather Service Blacksburg VA
310 PM EDT Wed Sep 20 2017

.SYNOPSIS...
A weak short wave will move southeast across our region this
evening, then high pressure follows for tonight through Saturday. A
cold front will approach the Mid Atlantic region the middle of next
week.

&&

.NEAR TERM /THROUGH THURSDAY/...
As of 300 PM EDT Wednesday...

The upper level pattern continues with ridging dominating the East
and troffing in the West. A shortwave trough with several lobes of
vorticity will travel southeast tonight into Thursday. Scattered
showers and thunderstorms have developed this afternoon in the deep
moisture convergence and surface LIs around minus 3. However,
convection should remain shallow as it will be fighting the
northwest wind especially out east. HRRR, HiResW-ARW-east, RUC, NAM
and GFS showed convection traveling eastward this afternoon into
this evening, then storms taper off on most solutions by 06z. In
general, scattered showers and thunderstorms will diminish this
evening into tonight with the loss of solar heating.

The combinations of light winds and low level moisture will result
in patches of fog late tonight into early Thursday morning. Low
temperatures tonight will range from the upper 40s in the colder
mountains valleys to the mid 60s in the Piedmont.

Differential heating, surface convergence and orographic lift
Thursday along the Appalachians may produce isolated to scattered
showers and thunderstorms. Convective depth will remain rather
shallow given dry mid-level air in place and surface-based CAPES
at/below 1000 J/kg. Any showers or thunderstorms should follow a
diurnal trend and dissipate with sunset. High temperatures Thursday
will vary from around 70 degrees in the mountains to the mid 80s in
the Piedmont.

&&

.SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY NIGHT/...
As of 310 PM EDT Wednesday...

Will stay rather quiet in our area this period, with showers/few
thunderstorms Thursday evening waning fairly quickly once sunset
occurs. Will see a weak convergent area set up over the southern
Appalachians Friday which should lead to isolated coverage of
showers or storms then drying out Friday night, with potential for a
stray shower into Saturday, though better upper support stays south
of our area, while upper ridge builds across the Ohio Valley into WV.

Temperatures to stay above normal by several degrees, but not seeing
any records threatened.

&&

.LONG TERM /SUNDAY THROUGH WEDNESDAY/...
As of 310 PM EDT Wednesday...

We will remain in an amplified pattern across the country with two
storms in the western Atlantic to watch. Will see Jose weaken into a
post-tropical system in the short term and continue to weaken this
period. Will see Hurricane Maria head north to off the NC coast,
with question remaining on how close and if it Maria comes ashore.
Model ensembles and consensus from NHC keep it east of the mainland.

Meanwhile, the central U.S. will be active with deep upper trough
and slow moving front. Will see this translate to upper ridge across
our area but expect potential for some clouds and possible showers
to flirt with our piedmont counties Tuesday per leftovers of Jose
interacting with coastal front/trough. However, threat of any
appreciable rain looks low for the next 7 days and even beyond the
front washes out as it moves into the eastern U.S. by Thu-Fri next
week.

Temps remain above normal during this time frame with lows in the
upper 50s to around 60 west, to lower to mid 60s east. Highs ranging
from the mid 70s to around 80 west, to lower to mid 80s east, with
some upper 80s not out of the question, especially if Maria stays
strong and we get on the western subsidence side of the system
without any mid/high clouds Tuesday.

&&

.AVIATION /19Z WEDNESDAY THROUGH MONDAY/...
As of 141 PM EDT Wednesday...

Scattered MVFR/localized IFR conditions in showers and
thunderstorms expected this afternoon into this evening.
Convection will diminish during the evening with the loss of
solar heating. With light winds and low level moisture, patches
of fog and low clouds will develop tonight into Thursday
morning. KLWB and KBCB are the two taf sites with the best
chance for IFR fog. LIFR conditions is possible at KLWB after
10z. There is also the chance for some light fog at KBLF
overnight. Morning low clouds and fog will lift by 14z Thursday,
return most taf locations to VFR conditions. Diurnal scattered
MVFR showers and thunderstorms will form Thursday afternoon
especially across the high terrain.

Medium confidence in ceilings, visibilities and winds during the
taf period.

Extended Aviation Discussion...

Overall persistence forecast to prevail for the rest of the
week, but with a lower probability of precipitation than today.
Strengthening high pressure remaining in place between exiting
Jose offshore and a weak cold front approaching from the west.
This should maintain good flying weather outside of isolated
diurnal showers and thunderstorms . Dry weather is expected
Friday through Monday. Isolated showers may be possible on
Tuesday.

&&

.RNK WATCHES/WARNINGS/ADVISORIES...
VA...None.
NC...None.
WV...None.

&&

SYNOPSIS...AMS/KK
NEAR TERM...KK
SHORT TERM...WP
LONG TERM...WP
AVIATION...AMS/KK

Hazardous Weather Outlook
National Weather Service Blacksburg VA
615 AM EDT Wed Sep 20 2017

NCZ001>006-018>020-VAZ007-009>020-022>024-032>035-043>047-058-059-
WVZ042>044-507-508-211015-
Ashe-Alleghany NC-Surry-Stokes-Rockingham-Caswell-Watauga-Wilkes-
Yadkin-Tazewell-Smyth-Bland-Giles-Wythe-Pulaski-Montgomery-Grayson-
Carroll-Floyd-Craig-Alleghany VA-Bath-Roanoke-Botetourt-Rockbridge-
Patrick-Franklin-Bedford-Amherst-Henry-Pittsylvania-Campbell-
Appomattox-Buckingham-Halifax-Charlotte-Mercer-Summers-Monroe-
Eastern Greenbrier-Western Greenbrier-
615 AM EDT Wed Sep 20 2017

This Hazardous Weather Outlook is for north central North Carolina,
northwest North Carolina, central Virginia, south central Virginia,
southwest Virginia, west central Virginia and southeast West
Virginia.

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

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

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

Special Weather Statement
National Weather Service BLACKSBURG VA
156 PM EDT WED SEP 20 2017

VAZ012-013-201830-
Pulaski-Wythe-
156 PM EDT WED SEP 20 2017

...A STRONG THUNDERSTORM WILL AFFECT
CENTRAL PULASKI AND NORTHEASTERN WYTHE COUNTIES...

Until 230 PM EDT

At 155 PM EDT, a strong thunderstorm capable of producing locally
heavy rainfall was located over Gunton Park, moving east at 15 mph.

Wind gusts up to 50 mph and half inch hail are possible with this
storm.

Locations impacted include...
Pulaski...
Dublin...
Allisonia...
Claytor Lake State Park...
and Draper.

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

LAT...LON 3712 8060 3694 8061 3693 8064 3694 8094
      3705 8094
TIME...MOT...LOC 1755Z 266DEG 14KT 3701 8087

JJM

Special Weather Statement
National Weather Service BLACKSBURG VA
246 PM EDT WED SEP 20 2017

VAZ017-032-201915-
Patrick-Floyd-
246 PM EDT WED SEP 20 2017

...A STRONG THUNDERSTORM WILL AFFECT
CENTRAL FLOYD AND NORTH CENTRAL PATRICK COUNTIES...

Until 315 PM EDT

At 245 PM EDT, a strong thunderstorm was located over Willis, moving
east at 20 mph.

Winds in excess of 30 mph and pea size hail are possible with this
storm.

Locations impacted include...
Floyd...
Indian Valley...
Willis...
Alum Ridge...
and Rocky Knob Recreation Area.

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 3685 8057 3696 8054 3695 8018 3692 8019
      3692 8020 3691 8020 3675 8034
TIME...MOT...LOC 1845Z 282DEG 16KT 3687 8046

JR

Special Weather Statement
National Weather Service BLACKSBURG VA
325 PM EDT WED SEP 20 2017

VAZ019-020-024-202000-
Bath-Rockbridge-Alleghany-
325 PM EDT WED SEP 20 2017

...A STRONG THUNDERSTORM WILL AFFECT
NORTHEASTERN ALLEGHANY...SOUTH CENTRAL BATH AND WEST CENTRAL
ROCKBRIDGE COUNTIES IN WEST CENTRAL VIRGINIA...

Until 400 PM EDT

At 325 PM EDT, a strong thunderstorm was located over Longdale
Furnace, moving southeast at 15 mph.

Winds in excess of 30 mph and pea size hail are possible with this
storm.

Locations impacted include...
Longdale Furnace.

LAT...LON 3784 7980 3794 7974 3789 7951 3776 7960
TIME...MOT...LOC 1925Z 293DEG 15KT 3787 7971

DS

Special Weather Statement
National Weather Service BLACKSBURG VA
338 PM EDT WED SEP 20 2017

VAZ033-202015-
Franklin-
338 PM EDT WED SEP 20 2017

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL FRANKLIN COUNTY...

Until 415 PM EDT

At 337 PM EDT, a strong thunderstorm was located over Wirtz, moving
east at 5 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Wirtz.

LAT...LON 3709 7995 3713 7994 3713 7984 3707 7985
TIME...MOT...LOC 1937Z 281DEG 6KT 3710 7991

DS

Special Weather Statement
National Weather Service BLACKSBURG VA
340 PM EDT WED SEP 20 2017

VAZ023-202015-
Botetourt-
340 PM EDT WED SEP 20 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN BOTETOURT COUNTY...

Until 415 PM EDT

At 339 PM EDT, a strong thunderstorm was located over Daleville,
moving east at 5 mph.

Winds in excess of 30 mph and pea size hail are possible with this
storm.

Locations impacted include...
Troutville...
and Daleville.

LAT...LON 3741 7998 3745 7996 3744 7987 3738 7991
TIME...MOT...LOC 1939Z 287DEG 6KT 3743 7995

DS

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