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Tropical Storm Debby: Mid-Atlantic Impacts


WxWatcher007
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Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
938 PM EDT Thu Aug 8 2024

VAC043-069-090145-
/O.CON.KLWX.TO.W.0038.000000T0000Z-240809T0145Z/
Frederick VA-Clarke VA-
938 PM EDT Thu Aug 8 2024

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 945 PM EDT FOR
SOUTHEASTERN FREDERICK AND CENTRAL CLARKE COUNTIES IN NORTHWESTERN
VIRGINIA...

At 938 PM EDT, a confirmed tornado was located over Berryville, or 10
miles east of Millwood Pike, moving northwest at 35 mph.

HAZARD...Damaging tornado.

SOURCE...Radar confirmed tornado.

IMPACT...For those in the direct path of a tornado touchdown, flying
         debris will be dangerous to those caught without shelter.
         Damage to roofs, siding, and windows may occur. Mobile
         homes may be damaged or destroyed. Tree damage is likely.

This tornado will be near...
  Berryville around 945 PM EDT.

Other locations impacted by this tornadic thunderstorm include Briggs
and Stringtown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

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

&&

LAT...LON 3911 7791 3907 7798 3916 7809 3918 7807
      3923 7797
TIME...MOT...LOC 0138Z 143DEG 29KT 3913 7796

TORNADO...OBSERVED
MAX HAIL SIZE...0.00 IN
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25 minutes ago, yoda said:

Large FFW blob issued

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
907 PM EDT Thu Aug 8 2024

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Warning for...
  Northwestern Fauquier County in northern Virginia...
  Western Loudoun County in northern Virginia...
  Clarke County in northwestern Virginia...
  Southeastern Frederick County in northwestern Virginia...
  North Central Rappahannock County in northwestern Virginia...
  Northeastern Warren County in northwestern Virginia...
  The City of Winchester in northwestern Virginia...
  Southern Berkeley County in the panhandle of West Virginia...
  Jefferson County in the panhandle of West Virginia...

* Until 1215 AM EDT.

* At 907 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Between 2 and 4 inches of rain
  have fallen. Additional rainfall amounts of 1 to 3 inches are
  possible in the warned area. Flash flooding is ongoing or expected
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Winchester...                      Front Royal...
  Charles Town...                    Millwood Pike...
  Purcellville...                    Ranson...
  Berryville...                      Inwood...
  Stephens City...                   Middleburg...
  Round Hill...                      Harpers Ferry...
  Bluemont...                        Delaplane...
  Corporation Of Ranson...           Linden...
  Hume...                            Kearneysville...
  Lovettsville...                    Marshall...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don`t drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

 

13 minutes ago, EastCoast NPZ said:

Heavy rain!  Finally.  Hallelujah. 

giphy.gif?cid=6c09b952psvihixoh79p1vph97

  • Haha 7
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Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
943 PM EDT Thu Aug 8 2024

VAC043-107-090215-
/O.CON.KLWX.TO.W.0039.000000T0000Z-240809T0215Z/
Loudoun VA-Clarke VA-
943 PM EDT Thu Aug 8 2024

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 PM EDT FOR WEST
CENTRAL LOUDOUN AND EAST CENTRAL CLARKE COUNTIES...

At 942 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Middleburg, or 13 miles west of Brambleton, moving
northwest at 25 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...For those in the direct path of a tornado touchdown, flying
         debris will be dangerous to those caught without shelter.
         Damage to roofs, siding, and windows may occur. Mobile
         homes may be damaged or destroyed. Tree damage is likely.

This dangerous storm will be near...
  Bluemont around 950 PM EDT.

Other locations impacted by this tornadic thunderstorm include Saint
Louis.
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Updated tornado section from 944pm LWX AFD


Tornadoes: The growing concern has certainly come to fruition as
evidenced by the number of Tornado Warnings issued over the past
2 to 4 hours. A number of these cells have showed TDS signatures
and occasional CC drops, all supportive of possible tornadoes.
This concern persists through the overnight hours as well.

Ample low-level shear, limited instability, and large
cyclonically curved hodographs remain in the picture overnight.
The area favorable for tornadoes will spread northward through
the Shenandoah Valley and into the West Virginia Panhandle. SPC
has highlighted these locations in a Slight Risk for severe
thunderstorms, driven by tornadoes. With the potential for most
of this activity to occur well after dark, we encourage people
to have a way to receive Tornado Warnings at night, and to be
ready to take shelter in the middle of the night, if needed.
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2.09” on the day so far.

Radar shows blob passed through, but that is probably deceptive. Individual cells trying to form out of thin air after the main blob. Particularly concerned about overnight tor threat. 

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1 minute ago, NorthArlington101 said:


There is a radar mode (idk the right term) that is scanning for the size of the stuff in the air. If it scans large things (like debris, big or small, leaves, houses, whatever) it shows noticeably on radar.

At “big” enough debris it can also show on regular reflectivity.

 

5 minutes ago, EastCoast NPZ said:

What is "cc drop"?

Correlation coefficient. 

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25 minutes ago, JenkinsJinkies said:

How likely is it for the eastern side of the storm to bust in terms of rainfall?

Having been a DC area lifer, rainfall busts on the eastern side of tropical systems don’t matter all that much. 

The most interesting effects still usually occur on the eastern side, or what others call the “dirty” side, regardless of rainfall totals.

David 1979, Bob 1985, Fran 1996, Isabel 2003- those were all relatively lower precip events on the east side of the storm but had very consequential effects on that side. 

A SE wind will down so many more trees than a N or NE wind in our region. And of course, storm surge in the bay completely depends on S and SE winds. 

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3 minutes ago, gymengineer said:

Having been a DC area lifer, rainfall busts on the eastern side of tropical systems don’t matter all that much. 

The most interesting effects still usually occur on the eastern side, or what others call the “dirty” side, regardless of rainfall totals.

David 1979, Bob 1985, Fran 1996, Isabel 2003- those were all relatively lower precip events on the east side of the storm but had very consequential effects on that side. 

A SE wind will down so many more trees than a N or NE wind in our region. And of course, storm surge in the bay completely depends on S and SE winds. 

There was still quite a bit of rain from Isabel, enough to flood Dundalk.

You're telling me that was the lesser precip side of the storm? Makes me wonder how bad it was out west.

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BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Baltimore MD/Washington DC
1038 PM EDT Thu Aug 8 2024

The National Weather Service in Sterling Virginia has issued a

* Tornado Warning for...
  West central Jefferson County in the Panhandle of West Virginia...
  Central Berkeley County in the Panhandle of West Virginia...

* Until 1115 PM EDT.

* At 1038 PM EDT, a severe thunderstorm capable of producing a
  tornado was located near Charles Town, moving north at 30 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...For those in the direct path of a tornado touchdown,
           flying debris will be dangerous to those caught without
           shelter. Damage to roofs, siding, and windows may occur.
           Mobile homes may be damaged or destroyed. Tree damage is
           likely.

* This dangerous storm will be near...
  Martinsburg and Inwood around 1045 PM EDT.

Other locations impacted by this tornadic thunderstorm include
Vanville, Winebrenners Cross, Berkeley, Martinsburg Airport,
Middleway, and Arden.
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Hopefully @Jrlg1181 is doing well

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
1048 PM EDT Thu Aug 8 2024

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Warning for...
  Western Albemarle County in central Virginia...
  Nelson County in central Virginia...
  Southeastern Augusta County in western Virginia...
  The Southeastern City of Staunton in western Virginia...
  The City of Waynesboro in western Virginia...

* Until 200 AM EDT.

* At 1048 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Between 2 and 5 inches of rain
  have fallen. Additional rainfall amounts of 1.5 to 3 inches are
  possible in the warned area. Flash flooding is ongoing or expected
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Staunton...                        Waynesboro...
  Stuarts Draft...                   Crozet...
  Grottoes...                        Crimora...
  Sherando...                        Shipman...
  Schuyler...                        Free Union...
  Wintergreen...                     Afton...
  Montebello...                      Fishersville...
  Lyndhurst...                       Nellysford...
  Ivy...                             Greenville...
  New Hope...                        Arrington...
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