Special Weather Statement, NWS Blacksburg, VA

Area Forecast Discussion
National Weather Service Blacksburg VA
1012 AM EDT Mon Aug 3 2020

.SYNOPSIS...
Tropical Storm Isaias will track northward along the East Coast
during today and Tuesday to bring bands of showers and
thunderstorms to the Mid Atlantic. A cold front should cross
overhead by Tuesday night but stall along the coast for the
remainder of this week.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
As of 345 AM EDT Monday...

Bands of showers and thunderstorms are moving northward toward
the Mid Atlantic. Some of the stronger storms have produced
frequent lightning, heavy rainfall, and gusty winds. Patchy fog
has been added for the remainder of the overnight hours given
the moist boundary layer and recent rainfall. Meanwhile,
Tropical Storm Isaias will churn northward along the Florida and
Georgia shoreline today. An approaching cold front will enter
the Ohio River Valley by this afternoon. The resulting moisture
convergence will result in increasing coverage of showers and
thunderstorms.

The showers and thunderstorms present several hazards with the
potential for severe due to damaging winds and flooding due to
heavy rainfall. As a result, no changes have been made to the
Flash Flood Watch due to an anticipated predecessor rain event,
or PRE, that typically occurs well away from landfalling
tropical cyclones when moisture interacts with some kind of
frontal boundary. There is the potential for isolated amounts
of one to two inches of rain along parts of the Blue Ridge
before the day is done. High temperatures should reach the 70s
in the mountains and the low to mid 80s in the Piedmont.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH WEDNESDAY/...
As of 330 AM EDT Monday...

Heading into Monday evening, the axis of heaviest rainfall
associated with the wave of energy (PRE) passing across the
lower Mid-Atlantic is expected to be situated across the
Piedmont and foothills of the Blue Ridge, lifting gradually
northeast. Meanwhile, Isaias will make landfall near the North
Carolina/South Carolina border and advance quickly northward
toward the mouth of Chesapeake Bay.

Isaias is a rather compact and fast-moving storm, with its
greatest impacts expected to remain confined east of a
Danville to Lynchburg line. After a brief lull in rain in the
wake of the departing wave of energy, the main bands of Isaias
will enter Halifax County shortly before dawn Tuesday. Northerly
windflow on the western half of the storm will draw drier air
across the Piedmont to counteract the moisture radiating outward
from the core of Isaias. The result will be a tight gradient in
rainfall accumulations as the storm passes, with 4+ inch
amounts expected across portions of Buckingham and Charlotte
Counties, with accumulations diminishing by about an inch
roughly every 30 miles to the west. The wind threat associated
with the storm is expected to be marginal at best, 25 to
occasional 35 mph gusts across Buckingham and Charlotte Counties
during the morning.

By noon Tuesday, the center of Isaias is expected to be near the
Chesapeake Bay, with dry air quickly working its way in from the
northwest in the wake of the storm as a trailing cold front
passes across the Appalachains chain. Clearing skies can be
expected across the Piedmont during the afternoon as winds shift
northwesterly and downslope. Cannot rule out a few showers
developing across the mountains during the afternoon, but
believe this activity will be spotty and disorganized, and will
fade toward sunset with the loss of afternoon heating.

Widely-scattered showers and thunderstorms will return for
Wednesday as the frontal boundary stalls across the Piedmont,
serving as the focus for afternoon convection. May see a few of
these storms become severe for brief periods of time, capable of
producing localized damaging wind gusts.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...
As of 300 PM EDT Sunday...

Weather pattern returns to more typical for summer time. Will
again be repetitive forecast of daily chances for afternoon
and evening thunderstorms, along with heat and humidity typical
of summer. No major deviation from long range synoptic scale
guidance.

&&

.AVIATION /14Z MONDAY THROUGH FRIDAY/...
As of 210 AM EDT Monday...

Outside of periods of heavy rainfall/storms, conditions will be
VFR. This AM's band of showers and storms have eroded and are being
replaced by a new line of thunderstorms stretching from western
TN, into SWVA through far east WV. These storms will obviously
produce sub VFR conditions when over TAF sites through today and
into this evening. As the day progresses, this line of
convection will traverse eastward while another band of storms
makes there way northward from central NC. These two bands will
ultimately provide a prolonged period of storm chances for all
TAF sites along and east of the Blue Ridge.

Eventually the storm move out of the region, ushering in the
next focus of the forecast, Isaias. Due to its proximity moving
up the coast, light to moderate rainfall will spread over the
eastern part of the region, bringing rainfall for LYH and DAN.
This also places BCB and ROA on the edge between light
rainfall/BR producing low ceilings, or gusty conditions as
downslope occurs with the wind shift associated with the system,
resulting in better flight ceilings. For now, leaning toward
the low ceilings lighter winds. Sites in WV will drop tonight,
but terrain influences combined with winds will determine
whether BLF and LWB drop sub VFR, or remain VFR with windy
conditions.

Extended Aviation Discussion...

Poor flying conditions are expected into Tuesday due to
Tropical Storm Isaias passing over eastern Virginia. Showers and
thunderstorms will continue through this time until a cold
front sweeps the moisture away by Tuesday night. Conditions
should improve to VFR on Wednesday and generally remain this way
through Friday, but some early morning patchy fog and scattered
afternoon showers and thunderstorms could temporarily restrict
flight conditions during this time.

&&

.HYDROLOGY...
A frontal boundary stalled near the spine of the Blue Ridge
will support bands of showers and thunderstorms that will pass
across the region through the day. Moisture will continue to
increase as Tropical Storm Isaias continues its approach, which
will cause some storms to produce 2 to 3 inch per hour rainfall
rates this afternoon and evening. In addition, training of
storms across the same locations is probable, leading to
prolonged periods of heavy rain and possibly localized flash
flooding. A few locations could receive 3 to 4 inches locally.

Just as this system exits to the northeast late this evening,
Tropical Storm Isaias is expected to make landfall near the
border of North Carolina and South Carolina tonight, and pass
rapidly northward to near the mouth of Chesapeake Bay by early
Tuesday afternoon. This will bring the potential of 3 to 5
inches of rain to areas east of a Danville to Lynchburg line.
Rainfall associated with Isaias will exit during early
afternoon, with rapidly clearing conditions expected thereafter.

&&

.RNK WATCHES/WARNINGS/ADVISORIES...
VA...Flash Flood Watch from 2 PM EDT this afternoon through Tuesday
     evening for VAZ022>024-033>035-043>047-058-059.
     Flash Flood Watch through Tuesday evening for VAZ015>017-032.
NC...Flash Flood Watch from 2 PM EDT this afternoon through Tuesday
     evening for NCZ004>006-020.
     Flash Flood Watch through Tuesday evening for NCZ001>003-018-
     019.
WV...None.

&&

SYNOPSIS...PW
NEAR TERM...PW
SHORT TERM...NF
LONG TERM...AMS
AVIATION...PW/RR
HYDROLOGY...NF

Hazardous Weather Outlook
National Weather Service Blacksburg VA
330 AM EDT Mon Aug 3 2020

NCZ001>003-018-019-VAZ015>017-032-040730-
Ashe-Alleghany NC-Surry-Watauga-Wilkes-Grayson-Carroll-Floyd-Patrick-
330 AM EDT Mon Aug 3 2020

...FLASH FLOOD WATCH IN EFFECT FROM 8 AM EDT THIS MORNING THROUGH
TUESDAY EVENING...

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

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flash Flood Watch.

In addition, scattered thunderstorms could become severe and produce
damaging winds.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flash Flood Watch.

In addition, scattered thunderstorms could become severe and produce
damaging winds during Tuesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

NCZ004>006-020-VAZ022>024-033>035-043>047-058-059-040730-
Stokes-Rockingham-Caswell-Yadkin-Roanoke-Botetourt-Rockbridge-
Franklin-Bedford-Amherst-Henry-Pittsylvania-Campbell-Appomattox-
Buckingham-Halifax-Charlotte-
330 AM EDT Mon Aug 3 2020

...FLASH FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH
TUESDAY EVENING...

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

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flash Flood Watch.

In addition, scattered thunderstorms could become severe and produce
damaging winds.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flash Flood Watch.

In addition, scattered thunderstorms could become severe and produce
damaging winds during Tuesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

VAZ007-009>014-018>020-WVZ042>044-507-508-040730-
Tazewell-Smyth-Bland-Giles-Wythe-Pulaski-Montgomery-Craig-
Alleghany VA-Bath-Mercer-Summers-Monroe-Eastern Greenbrier-
Western Greenbrier-
330 AM EDT Mon Aug 3 2020

This Hazardous Weather Outlook is for southwest Virginia, west
central Virginia and southeast West Virginia.

.DAY ONE...Today and tonight.

Scattered thunderstorms may bring locally heavy rainfall that could
lead to flash flooding. In addition, they may become severe and
produce damaging winds.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Scattered thunderstorms on Tuesday may bring locally heavy rainfall
that could lead to flash flooding. In addition, they may become
severe and produce damaging winds.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

PW

Special Weather Statement
National Weather Service BLACKSBURG VA
1009 AM EDT Mon Aug 3 2020

NCZ001>003-018-019-VAZ009-015-016-031515-
Surry-Ashe-Wilkes-Watauga-Alleghany-Grayson-Smyth-Carroll-
1009 AM EDT Mon Aug 3 2020

...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT
ALLEGHANY...NORTHWESTERN SURRY...WILKES...WATAUGA AND ASHE COUNTIES
IN NORTHWESTERN NORTH CAROLINA...SOUTHERN SMYTH AND GRAYSON COUNTIES
IN SOUTHWESTERN VIRGINIA...

At 1007 AM EDT, strong thunderstorms were clustered over Maple
Springs, or near Deep Gap, moving northeast at 30 mph.

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

Locations impacted include...
Boone...
Galax...
Marion...
North Wilkesboro...
Wilkesboro...
Chilhowie...
and Sparta.

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

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 3607 8141 3612 8155 3611 8181 3616 8183
      3621 8191 3626 8189 3629 8192 3634 8185
      3636 8180 3634 8171 3641 8174 3647 8170
      3653 8171 3659 8168 3663 8160 3682 8173
      3690 8168 3660 8079 3604 8113 3600 8132
TIME...MOT...LOC 1407Z 207DEG 26KT 3620 8143

VFJ

Special Weather Statement
National Weather Service BLACKSBURG VA
1055 AM EDT Mon Aug 3 2020

VAZ010>012-WVZ042-031545-
Giles-Bland-Wythe-Mercer-
1055 AM EDT Mon Aug 3 2020

...A STRONG THUNDERSTORM WILL AFFECT
WESTERN GILES...BLAND...NORTH CENTRAL WYTHE AND SOUTHEASTERN MERCER
COUNTIES...

At 1055 AM EDT, a strong thunderstorm was located over Bland, moving
northeast at 30 mph.

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

Locations impacted include...
Wytheville...
Bland...
Princeton...
Pearisburg...
Narrows...
Athens...
and Rocky Gap.

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

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 3708 8130 3709 8127 3711 8126 3713 8127
      3749 8101 3732 8069 3712 8089 3711 8093
      3709 8092 3693 8109 3707 8131
TIME...MOT...LOC 1455Z 213DEG 24KT 3707 8114

VFJ

Special Weather Statement
National Weather Service BLACKSBURG VA
1231 PM EDT Mon Aug 3 2020

VAZ020-031715-
Bath-
1231 PM EDT Mon Aug 3 2020

...A STRONG THUNDERSTORM WILL AFFECT
BATH COUNTY...

At 1231 PM EDT, a strong thunderstorm was located over Hot Springs,
moving northeast at 30 mph.

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

Locations impacted include...
Warm Springs...
Millboro...
Hot Springs...
Lake Moomaw...
Douthat State Park...
Nimrod Hall...
and Mountain Grove.

If outdoors, consider seeking shelter inside a building.

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

LAT...LON 3822 7971 3820 7956 3818 7951 3815 7953
      3817 7949 3816 7944 3810 7949 3809 7948
      3805 7952 3799 7954 3785 7970 3788 7975
      3789 7988 3795 7993 3797 8003 3810 7993
      3813 7995 3815 7992 3818 7992 3827 7980
TIME...MOT...LOC 1631Z 219DEG 27KT 3798 7985

VFJ

Special Weather Statement
National Weather Service BLACKSBURG VA
1241 PM EDT Mon Aug 3 2020

VAZ014-017>019-022-023-033-031745-
Botetourt-Franklin-Floyd-Montgomery-Craig-Roanoke-Alleghany-
1241 PM EDT Mon Aug 3 2020

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT
ROANOKE AND SOUTHWESTERN ALLEGHANY COUNTIES IN WEST CENTRAL
VIRGINIA...CRAIG AND NORTHERN FLOYD COUNTIES IN SOUTHWESTERN
VIRGINIA...BOTETOURT...NORTHWESTERN FRANKLIN COUNTIES IN WEST CENTRAL
VIRGINIA AND MONTGOMERY COUNTIES IN SOUTHWESTERN VIRGINIA...THE CITY
OF SALEM AND THE CITY OF ROANOKE...

At 1240 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Glenvar to near Pilot. Movement was
northeast at 25 mph.

Winds in excess of 30 mph are possible with these storms.

Locations impacted include...
Roanoke...
Blacksburg...
Salem...
Christiansburg...
Vinton...
Troutville...
and Boones Mill.

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

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 3766 7968 3764 7965 3743 7975 3740 7981
      3738 7977 3735 7979 3731 7985 3722 7984
      3713 7988 3697 8055 3701 8055 3750 8033
      3753 8029 3753 8031 3758 8029 3762 8022
      3764 8026 3767 8025 3767 7967
TIME...MOT...LOC 1640Z 231DEG 23KT 3730 8013 3704 8044

VFJ

Special Weather Statement
National Weather Service BLACKSBURG VA
104 PM EDT Mon Aug 3 2020

NCZ003>006-VAZ017-032>034-043>045-058-031745-
Stokes-Surry-Rockingham-Caswell-Henry-Franklin-Halifax-Patrick-Floyd-
Campbell-Bedford-Pittsylvania-
104 PM EDT Mon Aug 3 2020

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT
STOKES...EASTERN SURRY...ROCKINGHAM...CASWELL...CENTRAL CAMPBELL...
FLOYD...HENRY...PITTSYLVANIA...WESTERN HALIFAX...SOUTHERN BEDFORD...
PATRICK AND FRANKLIN COUNTIES...THE CITY OF DANVILLE AND THE CITY OF
MARTINSVILLE...

At 103 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Blairs to near Walnut Cove. Movement
was north at 45 mph.

Winds in excess of 40 mph and pea size hail are possible with these
storms.

Locations impacted include...
Danville...
Eden...
Reidsville...
Martinsville...
Rocky Mount...
Altavista...
and Wentworth.

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

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 3626 8049 3665 8050 3665 8049 3670 8045
      3675 8050 3699 8050 3736 7902 3654 7911
      3654 7914 3624 7916 3626 8045 3624 8045
TIME...MOT...LOC 1703Z 198DEG 39KT 3669 7942 3628 8018

VFJ

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