Flash Flood Warning 72, NWS Blacksburg, VA

Area Forecast Discussion
National Weather Service Blacksburg VA
800 PM EDT Thu Aug 21 2025

.SYNOPSIS...
A frontal boundary should drift southward during tonight into
Friday, which will limit the coverage of showers and storms.
A stronger cold front should approach during the weekend to
bring more widespread showers and storms. Cooler and drier
weather will follow for the upcoming week.

&&

.NEAR TERM /THROUGH FRIDAY/...
As of 200 PM EDT Thursday...

Key Messages:

1) Confidence is high for more scattered showers and
thunderstorms with locally heavy rain later this evening.

2) After more patchy fog tonight, Friday should see limited
coverage of afternoon showers and thunderstorms.

Coverage of showers is rather spotty on radar at this time, and
any lightning appears to only exist further south in North
Carolina. Regardless, the high-resolution models insist some
development of showers and thunderstorms later this afternoon
into the evening along the Blue Ridge. If any stronger storms
develop, the air mass still remains moist with precipitable
water values over 1.50 inches that could allow heavy rainfall
and potential localized flooding. Temperatures should reach the
mid 70s to the mid 80s this afternoon before falling into the
60s overnight.

Patchy fog and low clouds are expected for tonight, especially
along and west of the Blue Ridge. Friday could see a notable
drop in afternoon convection potential as Hurricane Erin pulls
further away from the East Coast, which will allow a frontal
boundary to drift southward towards South Carolina. A few
showers and thunderstorms may still spread northward enough to
reach the northwest North Carolina mountains by Friday
afternoon. Temperatures will be a tad lower on Friday with highs
in the lower 70s to the lower 80s.

&&

.SHORT TERM /FRIDAY NIGHT THROUGH SUNDAY NIGHT/...
As of 100 PM EDT Thursday...

Key Messages:

1. Showers and storms during the afternoon and evenings through
the weekend.

2. Heavy rain possible, and may lead to localized flooding.

High pressure will briefly develop over the eastern US in the
wake of Hurricane Erin Friday and into Saturday, before
sliding offshore and farther from the forecast area, as a cold
front approaches from the Ohio Valley. Easterly return flow
around the high will advect moisture in the area, and this will
spark some showers and thunderstorms Saturday afternoon and into
the evening. The highest probabilities are south and west of
the New River Valley, as the influence of the high will limit
precipitation chances for most areas east of the Blue Ridge.
Showers will linger into Sunday morning, and coverage will
increase through Sunday, with the continuing advance of the
front. Sunday afternoon will have the greatest coverage of
showers and storms, with convection initially reaching the
western mountains, and then tracking into the Piedmont by late
Sunday. Any severe threat looks to be isolated at this time,
with only modest instability, given possible morning cloud cover
and rain, and shear, on the order of 20 to 25 knots or so.
Heavy rain will be one of the main hazards, with PWATs forecast
to exceed 1.50" by Sunday afternoon. Localized flooding may
result, especially in low lying, urban, and poor drainage areas.

Temperatures will be just below to near normal through the
weekend. Highs will be in the low to mid 70s in the west, and
low to mid 80s in the east. Lows will be in the 60s, but fall
into the 50s in the west Sunday night.

&&

.LONG TERM /MONDAY THROUGH THURSDAY/...
As of 100 PM EDT Thursday...

Key Message:

1. Below normal temperatures and dry weather through most of the
period.

Surface high pressure will build into the area from the west,
following the passage of the cold front on Sunday. A few
showers may linger in the west early Monday morning, but
otherwise, there will be a stretch of dry weather for the area
through the middle of the work week. A strong 500mb trough will
slowly cross the eastern US through the first half of the week,
which will bring a notable change in airmass to the region. High
temperatures will drop to five to ten degrees below normal by
Tuesday and Wednesday, and lows will also be at least 5 degrees
below normal. Some nights may be cooler with the high pressure
sitting overhead and clearer skies, if the winds calm and
atmosphere decouples, and so would not be surprised if forecast
low temperatures trend another degree or two lower in subsequent
forecast updates, especially in elevated mountain valleys. NBM
probabilities for minimum temperatures below 42 degrees Thursday
morning are between 25% and 35% for Burkes Garden and Mount
Rogers VA, and a couple of the highest peaks in northwest NC.
Elsewhere west of the Blue Ridge, lows will be in the upper 40s
to near 50, and in the Piedmont, mid 50s. Most areas will not
have seen temperatures in these ranges since the beginning of
June.

&&

.AVIATION /00Z FRIDAY THROUGH TUESDAY/...
As of 745 PM EDT Thursday...

VFR conditions are currently being observed at most terminals
this evening with the exception of ROA where a thunderstorm has
currently anchored itself over the airport and city. This has
lead to LIFR conditions that should lift over the next hour or
so. During the overnight hours, MVFR to IFR CIGs and VSBYs are
expected to develop at all terminals, and linger through the mid
morning hours. Along with these restrictions, winds will
initially start out of the northeast across the Piedmont during
the overnight and early morning hours before transitioning to
easterly/southeasterly through the afternoon and evening hours
on Friday. Terminals west of the Blue Ridge look to remain
predominately out of the southeast at around 5 knots or less
through the TAF period. With the frontal boundary that has
remained over the region the last several days makes its way
south of the area, most shower and thunderstorm activity should
remain well south of the area on Friday.

.EXTENDED AVIATION OUTLOOK...

Patchy fog will be possible during early Saturday morning due
to a moist air mass remaining in place. A stronger cold front
will approach this weekend to bring more widespread showers and
thunderstorms. Conditions may turn somewhat breezy by Monday due
to increasing northwest flow behind the cold front. Cooler and
drier conditions should follow into the middle of the week.

&&

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

&&

SYNOPSIS...PW
NEAR TERM...PW
SHORT TERM...AS
LONG TERM...AS
AVIATION...EB/PW

Hazardous Weather Outlook
National Weather Service Blacksburg VA
1233 PM EDT Thu Aug 21 2025

NCZ001-002-018-VAZ007-009>020-022>024-WVZ042>044-507-508-221645-
Ashe-Alleghany NC-Watauga-Tazewell-Smyth-Bland-Giles-Wythe-Pulaski-
Montgomery-Grayson-Carroll-Floyd-Craig-Alleghany VA-Bath-Roanoke-
Botetourt-Rockbridge-Mercer-Summers-Monroe-Eastern Greenbrier-
Western Greenbrier-
1233 PM EDT Thu Aug 21 2025

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

.DAY ONE...This afternoon and tonight.

Thunderstorms this afternoon and evening will be capable of
producing heavy rainfall that could trigger localized flooding.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

There is a low probability for widespread hazardous weather.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

NCZ003>006-019-020-VAZ032>035-043>047-058-059-221645-
Surry-Stokes-Rockingham-Caswell-Wilkes-Yadkin-Patrick-Franklin-
Bedford-Amherst-Henry-Pittsylvania-Campbell-Appomattox-Buckingham-
Halifax-Charlotte-
1233 PM EDT Thu Aug 21 2025

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

.DAY ONE...This afternoon and tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

PW

Preliminary Local Storm Report
National Weather Service Blacksburg VA
825 PM EDT Thu Aug 21 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0820 PM     Flash Flood      2 SW Roanoke Airport    37.31N 80.01W
08/21/2025                   City of Roanoke    VA   Public

            Social media post showing Peters Creek Road
            in Roanoke completely flooded with around 2
            feet of water as cars are driving through
            it.

&&

JCB

Preliminary Local Storm Report
National Weather Service Blacksburg VA
833 PM EDT Thu Aug 21 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0831 PM     Flash Flood      Roanoke                 37.28N 79.96W
08/21/2025                   City of Roanoke    VA   Emergency Mngr

            At least a dozen swift water rescues
            reported around the City of Roanoke.

&&

VFJ

Preliminary Local Storm Report
National Weather Service Blacksburg VA
912 PM EDT Thu Aug 21 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0905 PM     Flash Flood      2 SSE Roanoke Airport   37.31N 79.98W
08/21/2025                   City of Roanoke    VA   Emergency Mngr

            The first floor of an extended stay
            apartment building was evacuated due to
            floodwater inundation. An image on social
            media from the second floor showed deep
            moving water completely covering a parking
            lot.

&&

VFJ

Preliminary Local Storm Report
National Weather Service Blacksburg VA
921 PM EDT Thu Aug 21 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0920 PM     Rain             2 SW Roanoke Airport    37.31N 80.01W
08/21/2025  M4.15 Inch       City of Roanoke    VA   Mesonet

            Local Mesonet site reported 4.15 inches of
            rain in Roanoke, VA.

&&

JCB

Special Weather Statement
National Weather Service BLACKSBURG VA
924 PM EDT Thu Aug 21 2025

NCZ003-004-VAZ016-032-220200-
Stokes NC-Surry NC-Patrick VA-Carroll VA-
924 PM EDT Thu Aug 21 2025

...A STRONG THUNDERSTORM WILL IMPACT
NORTHEASTERN SURRY...STOKES...SOUTHEASTERN CARROLL AND SOUTHWESTERN
PATRICK COUNTIES THROUGH 1000 PM EDT...

At 924 PM EDT, Doppler radar was tracking a strong thunderstorm over
Westfield, or near Francisco, moving south at 10 mph.

HAZARD...Wind gusts up to 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Mount Airy...
Flat Rock...
Pilot Mountain...
Stuart...
Danbury...
Cana...
and Francisco.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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.

&&

LAT...LON 3668 8065 3665 8020 3635 8012 3631 8040
      3638 8071
TIME...MOT...LOC 0124Z 340DEG 9KT 3649 8045

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

EB

Preliminary Local Storm Report
National Weather Service Blacksburg VA
929 PM EDT Thu Aug 21 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0928 PM     Flood            1 ESE Callaway          37.01N 80.04W
08/21/2025                   Franklin           VA   911 Call Center

            Emergency Manager reported a roadway was
            flooded in the 7800 block of Callaway road
            in Franklin County Virginia.

&&

EB