Special Weather Statement, NWS Blacksburg, VA

Area Forecast Discussion
National Weather Service Blacksburg VA
234 PM EDT Wed Jun 9 2021

.SYNOPSIS...
Low pressure will move slowly eastward through Friday across
the Ohio Valley. A backdoor front slides into the mid-Atlantic
Thursday night and slowly heads south to North Carolina by
Saturday. This will allow for daily rain and thunderstorms
through Saturday.

&&

.NEAR TERM /THROUGH THURSDAY/...
As of 100 PM EDT Wednesday...

High-res and synoptic models still remain all over the board
for this afternoon, but the general idea is the same, and
currently feel that the threat of measurable rain is likely for
the entire forecast area. No change in airmass will again
present a problem with locally heavy rain/flooding concerns.
Area with the most rain the past 2 days has been the mountains
of southeast WV into the Alleghanys of VA north of Roanoke, as
well as portions of the Blue Ridge south of Floyd.

Storm motion continues to be fairly slow 10-15 mph and will likely
see outflow induced convective development as well, with storms
propagating at times from southwest to northeast, to northwest to
southeast. As far as severe potential today and tonight, its
low with a saturated sounding, but cannot rule out a wet
microburst. Heavy rain and lightning still remains the highest
threat. Coverage of storms and rain tapers off overnight, but
still can expect spotty coverage through tomorrow morning.

Much of the same for tomorrow, with a weak open wave approaching
from the west. Model guidance also varies quite a bit, but still
has the general idea of another round of fairly widespread
afternoon/evening rain and thunderstorms. Once again, with the
likelihood of drifting and backbuilding storms in a marginally high
moisture-rich environment, will need to continue to monitor for
localized flooding.

Still expecting mid to upper 80s east of the Blue Ridge this
afternoon where there has been ample sun. Slightly lowered
temperatures in the far west where cloud cover has held on.
Temperatures tonight will be muggy with no change in airmass and
plenty of clouds around, so looking at lower to mid 60s
mountains to upper 60s east. Went slightly cooler tomorrow for
the fact there will be ample cloud cover and some lingering
shower activity.

Could also be contending with some patchy dense fog again
overnight and into early tomorrow morning, especially is areas
that receive rain this afternoon/evening.

&&

.SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY NIGHT/...
As of 210 PM EDT Wednesday...

An upper level trough will approach the area Thursday night.
This system will develop a surface reflection over the
Carolinas. Meanwhile, a back door cold front will slowly move
into northern Virginia. These systems will interact with each
other bringing a period of heavy rain and the threat for
flooding to the area Thursday night into Friday night.

The first vulnerable spot will be southeastern West Virginia,
who has seen more rain than most the past couple of days. The
next spot will be northwestern North Carolina mountains. On
Friday, the axis of heavy rain (Lewisburg WV to Lynchburg VA
northward) looks to be concentrated along the cold front. As the
front sinks south into the area Friday night into Saturday
morning, the heavy rain will be located along and south of
Highway 460 east of the Blue Ridge. On Saturday, the front and
heavy rain should move into North Carolina. Rain chance should
also taper from north to south in the afternoon.

Rainfall amounts over the 48 hour period (Thursday night into
Saturday) will range from one to two inches, local higher
amounts possible.

One factor working in our favor to limit widespread flooding is
the mostly dry antecedence conditions the past couple of weeks
that has kept creeks and streams levels below normal. Full
green-up of vegetation will also play in our favor as long as
high rainfall rates are not sustained for a long duration.
However, with several system converging in the region and PWATS
remaining elevated, Flood Watches, Warnings and Advisories are
expected, but for localized events, especially urban areas.

With a good portion of the time seeing rain Friday,
temperatures will run cooler than normal with readings generally
in the 70s. As the rain clears out Saturday, temperatures
should return to normal levels.

&&

.LONG TERM /SUNDAY THROUGH WEDNESDAY/...
As of 215 PM EDT Wednesday...

One surface trough is expected to pass over the region Sunday
and another one on Monday. With limited moisture and westerly
flow, only a few isolated mountain showers are possible each
afternoon. Temperatures Sunday will be close to normal and
around 5F warmer than normal on Monday.

A low pressure system will drop out of Canada and into the
northeastern US Wednesday. This trough will dip down into
northern Florida, bring cooler than normal temperatures to the
region to end the workweek.

&&

.AVIATION /19Z WEDNESDAY THROUGH MONDAY/...
As of 100 PM EDT Wednesday...

Expect mainly VFR into the afternoon. However, showers and
thunderstorms will become scattered to numerous and most sites
should see storms at least in the vicinity, with decent
confidence that all sites will see some storms for a bit between
18-23z. Any storms will likely send cigs/vsbys to IFR or lower.

There still looks to be some coverage of showers/storms through
the overnight, but dwindling after 06z. Models showing
disagreement on best chances after 06z, thus left out VCTS.

Likely to see another round of fog overnight, especially those
who see rain. Kept low vsby and cigs at all TAF locations
tonight between midnight and 8am to account for this.

Will have a few showers lingering through tomorrow morning, with
another round of heavier showers and thunderstorms likely to
develop by early Thursday afternoon.

Extended Aviation Discussion...

Expect off and on stormy weather into at least early Saturday as
a back door front moves from the mid-Atlantic/Ohio Valley into
the Carolinas/southern Appalachians. So more of the same with
better coverage of storms in afternoon/evenings with potential
for lingering storms into the overnight with the front Friday-
early Saturday.

We may less coverage Sunday between two fronts, but still a
chance, but overall should be mainly VFR once we get past
Saturday. Though rain/storm chances will be high Thu-Sat, there
will be windows of VFR, though expect some impacts across the
region.

&&

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

&&

SYNOPSIS...BMG/WP
NEAR TERM...BMG
SHORT TERM...RCS
LONG TERM...BMG/RCS
AVIATION...BMG/WP

Hazardous Weather Outlook
National Weather Service Blacksburg VA
213 PM EDT Wed Jun 9 2021

NCZ001>006-018>020-VAZ007-009>020-022>024-032>035-043>047-058-059-
WVZ042>044-507-508-101815-
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-
213 PM EDT Wed Jun 9 2021

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 produce heavy rain at times this afternoon into
tonight. Localized flash flooding will be possible.

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

Storms will likely produce heavy rain at times Thursday and Friday.
This will maintain a threat for localized flash flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

Special Weather Statement
National Weather Service BLACKSBURG VA
336 PM EDT Wed Jun 9 2021

VAZ045-092000-
Campbell-
336 PM EDT Wed Jun 9 2021

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

At 336 PM EDT, a strong thunderstorm was located near Rustburg,
moving east at 10 mph.

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

Locations impacted include...
Rustburg...
and Spring Mills.

Locally heavy rain will quickly reduce visibility and result in
ponding of water on roadways, standing water in low lying areas, and
minor flooding of creeks, streams, and areas of poor drainage.
Drivers are urged to slow down and use extra caution to avoid
hydroplaning.

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 3720 7917 3732 7912 3727 7893 3714 7896
TIME...MOT...LOC 1936Z 276DEG 11KT 3723 7905

DS

Special Weather Statement
National Weather Service BLACKSBURG VA
351 PM EDT Wed Jun 9 2021

VAZ013-092015-
Pulaski-
351 PM EDT Wed Jun 9 2021

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

At 350 PM EDT, a strong thunderstorm was located near Dublin, moving
northeast at 15 mph.

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

Locations impacted include...
Pulaski...
and Dublin.

Locally heavy rain with rates of two to four inches per hour will
quickly reduce visibility and result in ponding of water on
roadways, standing water in low lying areas, and minor flooding of
creeks, streams, and areas of poor drainage.
Drivers are urged to slow down and use extra caution to avoid
hydroplaning.

LAT...LON 3715 8086 3719 8077 3721 8070 3710 8059
      3702 8087 3708 8089
TIME...MOT...LOC 1950Z 238DEG 12KT 3711 8076

DS

Special Weather Statement
National Weather Service BLACKSBURG VA
354 PM EDT Wed Jun 9 2021

VAZ010-WVZ042-092030-
Bland-Mercer-
354 PM EDT Wed Jun 9 2021

...A SHOWER WILL AFFECT NORTH CENTRAL BLAND AND SOUTH CENTRAL MERCER
COUNTIES...

At 353 PM EDT, a heavy rain producing shower was located over
Bluefield, moving northeast at 10 mph. It may intensify to a
thunderstorm.

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

Locations impacted include...
Bluefield...
Rocky Gap...
Ceres...
and Clear Fork.

Torrential rainfall with rates of two to four inches per hour is
also occurring with this shower, and may cause localized flooding.
Do not drive your vehicle through flooded roadways.

LAT...LON 3720 8119 3726 8123 3735 8111 3725 8103
TIME...MOT...LOC 1953Z 247DEG 9KT 3726 8117

DS

Special Weather Statement
National Weather Service BLACKSBURG VA
357 PM EDT Wed Jun 9 2021

NCZ003-092030-
Surry-
357 PM EDT Wed Jun 9 2021

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

At 357 PM EDT, a strong thunderstorm was located over White Plains,
or near Mount Airy, moving east at 15 mph.

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

Locations impacted include...
Mount Airy...
Flat Rock...
Dobson...
Pilot Mountain...
Pine Ridge...
Toast...
and White Plains.

Locally heavy rain with rates of two to four inches per hour will
quickly reduce visibility and result in ponding of water on
roadways, standing water in low lying areas, and minor flooding of
creeks, streams, and areas of poor drainage.
Drivers are urged to slow down and use extra caution to avoid
hydroplaning.

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 3638 8072 3650 8073 3654 8049 3635 8047
TIME...MOT...LOC 1957Z 265DEG 11KT 3645 8064

DS

Special Weather Statement
National Weather Service BLACKSBURG VA
412 PM EDT Wed Jun 9 2021

VAZ014-092045-
Montgomery-
412 PM EDT Wed Jun 9 2021

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

At 410 PM EDT, a strong thunderstorm was located near Mc Donalds
Mill, or near Blacksburg, moving east at 5 mph.

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

Locations impacted include...
Mc Donalds Mill.

Locally heavy rain with rates of two to four inches per hour will
quickly reduce visibility and result in ponding of water on
roadways, standing water in low lying areas, and minor flooding of
creeks, streams, and areas of poor drainage.
Drivers are urged to slow down and use extra caution to avoid
hydroplaning.

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 3731 8026 3729 8024 3723 8023 3725 8041
      3732 8041 3733 8026
TIME...MOT...LOC 2010Z 272DEG 6KT 3728 8034

DS

Special Weather Statement
National Weather Service BLACKSBURG VA
418 PM EDT Wed Jun 9 2021

VAZ059-092100-
Charlotte-
418 PM EDT Wed Jun 9 2021

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN CHARLOTTE COUNTY...

At 417 PM EDT, a strong thunderstorm was located over Redoak, moving
east at 5 mph.

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

Locations impacted include...
Redoak...
and Wylliesburg.

Locally heavy rain with rates of two to four inches per hour will
quickly reduce visibility and result in ponding of water on
roadways, standing water in low lying areas, and minor flooding of
creeks, streams, and areas of poor drainage.
Drivers are urged to slow down and use extra caution to avoid
hydroplaning.

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 3670 7865 3674 7869 3676 7867 3679 7868
      3680 7868 3681 7867 3682 7868 3683 7868
      3684 7867 3688 7867 3688 7850
TIME...MOT...LOC 2017Z 276DEG 5KT 3680 7864

DS