Special Weather Statement, NWS Blacksburg, VA

Area Forecast Discussion
National Weather Service Blacksburg VA
234 PM EDT Fri Aug 7 2020

.SYNOPSIS...
High pressure will gradually build across the region this
weekend and into the first part of next week.

&&

.NEAR TERM /THROUGH SATURDAY/...
As of 230 PM EDT Friday...

Water vapor imagery shows an upper level trough extending from
Ontario into the Ohio Valley. This trough is gradually filling
and weakening with time. Scattered showers and thunderstorms
are expected along the leading edge of the trough this evening
from PA/MD into VA/NC. Severe threat appears marginal with 20-30
kt southwesterly mid-level winds providing weak but sufficient
deep-layer shear for some convective organization. The strongest
cells may produce locally gusty/damaging wind gusts.

The shower/storm threat is expected to wane by midnight with
light winds and clearing skies setting stage for another round
of late night fog/stratus. Similar to Friday morning, the
stratus may linger through mid morning Saturday before
dissipating. With the upper trough becoming less discernible
with time, the overall trend this weekend will be for lessening
storm chances and a greater opportunity for drying. High
pressure is forecast to gradually build over the area this
weekend, the increasing subsidence resulting in warming
temperatures...but still typical of early August.

&&

.SHORT TERM /SATURDAY NIGHT THROUGH MONDAY NIGHT/...
As of 200 PM EDT Friday...

The axis of the upper trof will finally push through the Appalachians
and central mid Atlantic region, allowing high pressure at the surface
to start nudging in from the Ohio valley. This will reduce our chances
for showers/thunderstorms considerably with most locations west of the
Blue Ridge looking to remain mainly dry, while locations east of the
Ridge hold on to a chance for scattered showers/storms through the
weekend. But by Monday we start to feel the influence of an upper trof
moving through the Great Lakes region with some short wave energy
approaching from thew west. This will start increasing our chances for
showers/thunderstorms once again as we head into next week.

Temperatures will be on a warming trend into the first part of next
week. Highs on Sunday will generally be in the upper 80s east of the
Ridge with low/mid 80s west. By Monday readings will reach the low/mid
90s east, mid/upper 80s west. Lows will generally be in the 60s.

&&

.LONG TERM /TUESDAY THROUGH THURSDAY/...
As of 200 PM EDT Friday...

High pressure remains draped over the southern U.S. through the
forecast period. Meanwhile, the jet stream will continue to remain
locked up north in Canada while a trough finishes pressing through
the Great Lakes Region Tuesday. Some far reaching forcing combined
with SW flow from the high will help pull in a very warm airmass for
Tuesday and Wednesday with summertime like diurnal convection.
Tuesday looks to be the warmest with parts of the Piedmont and
Foothills peaking in the low 90s.

Guidance points to a mid-level disturbance that sets up shop over
the southern Ohio/Tennessee Valley Thursday into Friday that will
slowly traverse across the region until being picked up by a new
trough next weekend. While influence from this system will be far,
it should be able to work with the warm, saturated airmass that will
be in place by this point to help increase the overall drive in
diurnal showers and thunderstorms each afternoon. In turn, the
increased convection and clouds from this will help drive our
temperatures down slightly for the remainder of the work week.

&&

.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
As of 200 PM EDT Friday...

Expecting mainly MVFR conditions through early saturday as
stalled front results in scattered showers and thunderstorms
until midnight, followed by low stratus and fog after midnight
and early Saturday morning. LIFR/IFR is expected within the
river valleys after midnight tonight due to the formation of
status and areas of fog. After the fog/stratus dissipates
Saturday morning, expecting mainly VFR for Saturday afternoon.
There is still a slight chance for a shower/thundershower
Saturday afternoon, but the coverage is expected to be isolated.
Winds through the period are expected to be light and variable,
except near thunderstorms where stronger gusts will occur.

Forecast confidence is good.

Extended Aviation Discussion...

High pressure builds into the weekend with lesser chances of
storms. Pattern should be more typical of summer into Monday
with scattered afternoon/evening storms. Overall VFR outside
storms and late night valley fog. Low pressure may bring a
better threat of storms Tuesday.

&&

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

&&

SYNOPSIS...PM
NEAR TERM...PM
SHORT TERM...MBS
LONG TERM...RR
AVIATION...PM

Hazardous Weather Outlook
National Weather Service Blacksburg VA
224 PM EDT Fri Aug 7 2020

NCZ004>006-020-VAZ043>047-058-059-080900-
Stokes-Rockingham-Caswell-Yadkin-Henry-Pittsylvania-Campbell-
Appomattox-Buckingham-Halifax-Charlotte-
224 PM EDT Fri Aug 7 2020

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

.DAY ONE...This afternoon and tonight.

Thunderstorms will be scattered to numerous again today. Some may
become strong with locally heavy rainfall and flooding possible.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

There is a low probability for widespread hazardous weather.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

NCZ001>003-018-019-VAZ007-009>020-022>024-032>035-WVZ042>044-507-508-
080900-
Ashe-Alleghany NC-Surry-Watauga-Wilkes-Tazewell-Smyth-Bland-Giles-
Wythe-Pulaski-Montgomery-Grayson-Carroll-Floyd-Craig-Alleghany VA-
Bath-Roanoke-Botetourt-Rockbridge-Patrick-Franklin-Bedford-Amherst-
Mercer-Summers-Monroe-Eastern Greenbrier-Western Greenbrier-
224 PM EDT Fri Aug 7 2020

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...This afternoon and tonight.

Thunderstorms will be scattered to numerous again today. Some may
become strong to severe with isolated wind damage and hail the main
threats. Locally heavy rainfall may also cause flooding.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

There is a low probability for widespread hazardous weather.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

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Special Weather Statement
National Weather Service BLACKSBURG VA
130 PM EDT Fri Aug 7 2020

VAZ032-071800-
Patrick-
130 PM EDT Fri Aug 7 2020

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

At 130 PM EDT, a strong thunderstorm was located over Woolwine,
moving east at 15 mph.

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

Locations impacted include...
Woolwine...
Rocky Knob Recreation Area...
Charity...
and Buffalo Ridge.

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.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 3680 8038 3680 8036 3681 8035 3687 8019
      3685 8014 3673 8009 3671 8009 3670 8037
TIME...MOT...LOC 1730Z 255DEG 12KT 3678 8030

RR

Special Weather Statement
National Weather Service BLACKSBURG VA
134 PM EDT Fri Aug 7 2020

NCZ001-002-019-071800-
Ashe-Wilkes-Alleghany-
134 PM EDT Fri Aug 7 2020

...A STRONG THUNDERSTORM WILL AFFECT
WESTERN ALLEGHANY...NORTH CENTRAL WILKES AND SOUTHEASTERN ASHE
COUNTIES IN NORTHWESTERN NORTH CAROLINA...

At 134 PM EDT, a strong thunderstorm was located over Glendale
Springs, moving east at 10 mph.

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

Locations impacted include...
West Jefferson...
Laurel Springs...
Glendale Springs...
Mc Grady...
Stratford...
Idlewild...
and Wagoner.

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.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 3630 8145 3639 8149 3654 8121 3632 8111
TIME...MOT...LOC 1734Z 257DEG 9KT 3636 8138

RR

Special Weather Statement
National Weather Service BLACKSBURG VA
210 PM EDT Fri Aug 7 2020

NCZ001-002-VAZ015-071845-
Ashe-Alleghany-Grayson-
210 PM EDT Fri Aug 7 2020

...STRONG THUNDERSTORMS WILL AFFECT ALLEGHANY...ASHE COUNTIES IN
NORTHWESTERN NORTH CAROLINA AND SOUTHEASTERN GRAYSON COUNTIES IN
SOUTHWESTERN VIRGINIA...

At 209 PM EDT, strong thunderstorms extended from near Baywood to
near Baldwin. Movement was southeast at 5 mph.

Winds in excess of 40 mph and half inch hail are possible with these
storms.

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

Locations impacted include...
Galax...
Sparta...
Jefferson...
West Jefferson...
Independence...
Laurel Springs...
and Ennice.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional
information and possible warnings from the National Weather Service.

LAT...LON 3640 8168 3672 8104 3664 8092 3663 8093
      3663 8091 3659 8086 3659 8087 3643 8115
      3643 8117 3641 8118 3636 8127 3637 8132
      3637 8136 3631 8136 3629 8140 3629 8141
      3628 8141 3624 8148 3627 8154
TIME...MOT...LOC 1809Z 295DEG 5KT 3664 8100 3633 8156

MBS

Special Weather Statement
National Weather Service BLACKSBURG VA
222 PM EDT Fri Aug 7 2020

VAZ022-033-034-071845-
Franklin-Roanoke-Bedford-
222 PM EDT Fri Aug 7 2020

...A STRONG THUNDERSTORM WILL AFFECT
SOUTHEASTERN ROANOKE...WEST CENTRAL BEDFORD AND NORTHEASTERN FRANKLIN
COUNTIES...

At 221 PM EDT, a strong thunderstorm was located over Boones Mill,
moving east at 10 mph.

Winds in excess of 40 mph and pea size hail are possible with this
storm.

Locations impacted include...
Boones Mill...
Chamblissburg...
Burnt Chimney...
Western Smith Mountain Lake...
Northwest Smith Mountain Lake...
Goodview...
and Westlake Corner.

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

LAT...LON 3708 8005 3717 7999 3726 7988 3726 7963
      3699 7973
TIME...MOT...LOC 1821Z 277DEG 8KT 3715 7992

BMG

Special Weather Statement
National Weather Service BLACKSBURG VA
244 PM EDT Fri Aug 7 2020

VAZ033-071930-
Franklin-
244 PM EDT Fri Aug 7 2020

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

At 244 PM EDT, a strong thunderstorm was located over Burnt Chimney,
or near Boones Mill, moving east at 10 mph.

Winds in excess of 40 mph and pea size hail are possible with this
storm.

Locations impacted include...
Boones Mill...
Burnt Chimney...
Western Smith Mountain Lake...
Northwest Smith Mountain Lake...
Wirtz...
Westlake Corner...
and Union Hall.

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

LAT...LON 3708 8002 3714 7995 3716 7991 3722 7987
      3722 7983 3723 7982 3721 7980 3723 7980
      3723 7978 3720 7978 3720 7976 3719 7976
      3719 7972 3715 7970 3702 7972
TIME...MOT...LOC 1844Z 267DEG 9KT 3712 7985

BMG