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2023 Mid-Atlantic Severe Wx Thread (General Discussion)


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BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
340 PM EDT Mon Aug 7 2023

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  West central Frederick County in northwestern Virginia...
  Northeastern Hardy County in eastern West Virginia...
  Southeastern Hampshire County in eastern West Virginia...

* Until 415 PM EDT.

* At 339 PM EDT, a severe thunderstorm was located 7 miles northwest
  of Wardensville, or 13 miles southeast of Romney, moving northeast
  at 50 mph.

  THIS IS A DESTRUCTIVE STORM FOR SOUTHEASTERN HAMPSHIRE, NORTHERN
  HARDY, AND FREDERICK COUNTIES.

  HAZARD...80 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable damage to trees and power lines. Your
           life is at significant risk if outdoors. In addition to
           some trees falling into homes, wind damage is possible to
           roofs, sheds, open garages, and mobile homes.

* Locations impacted include...
  Capon Bridge, Yellow Spring, High View, Delray, Rock Enon Springs,
  Kirby, Rio, Gore, Timber Ridge and Lehew.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM EDT for northwestern
Virginia...and eastern West Virginia.

This is an EXTREMELY DANGEROUS SITUATION with tornado like wind
speeds expected. Mobile homes and high profile vehicles are
especially susceptible to winds of this magnitude and may be
overturned. For your protection move to an interior room on the
lowest floor of a building. This storm has the potential to cause
serious injury and significant property damage.

A Tornado Watch remains in effect until 900 PM EDT for northwestern
Virginia...and eastern West Virginia.

&&

LAT...LON 3910 7870 3920 7875 3937 7837 3920 7829
TIME...MOT...LOC 1939Z 246DEG 44KT 3917 7865

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...80 MPH
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1 minute ago, TSSN+ said:

Velocities gaining on the line. 70-80mph in there 

Seems like the strongest shear is starting to get a jolt eastwards. Made a post a little earlier suggesting this was becoming more of a straight-line wind event versus tornado as I was wondering if that shear would end up lagging but hodos are certainly starting to enlarged and gain curvature. 

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1 minute ago, WxWatcher007 said:

Yep. This has potential to be higher end overall (not necessarily everywhere) in its own right. 

This event wrt meso setup in the derecho airmass would probably have been atop our all time severe list. Unlikely considering the jet & L/H positioning that we’d get that kind of heat, but it would be a wild show.

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BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
349 PM EDT Mon Aug 7 2023

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  Washington County in north central Maryland...
  Northwestern Frederick County in north central Maryland...
  North central Loudoun County in northern Virginia...
  East central Frederick County in northwestern Virginia...
  North central Clarke County in northwestern Virginia...
  Jefferson County in the Panhandle of West Virginia...
  Eastern Berkeley County in the Panhandle of West Virginia...

* Until 430 PM EDT.

* At 349 PM EDT, severe thunderstorms were located along a line
  extending from near Wilson-Conococheague to 8 miles west of Inwood,
  moving east at 40 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damaging winds will cause some trees and large branches
           to fall. This could injure those outdoors, as well as
           damage homes and vehicles. Roadways may become blocked by
           downed trees. Localized power outages are possible.
           Unsecured light objects may become projectiles.

* Locations impacted include...
  Hagerstown, Martinsburg, Charles Town, Shepherdstown, Municipal
  Stadium, Robinwood, Brunswick, Fountainhead-Orchard Hills, Ranson,
  Boonsboro, Smithsburg, Inwood, Paramount-Long Meadow,
  Wilson-Conococheague, Williamsport, Mount Aetna, Mount Lena, San
  Mar, Harpers Ferry and Long Meadow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with these storms. Move indoors immediately.
Lightning is one of nature`s leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

A Tornado Watch remains in effect until 900 PM EDT for north central
Maryland...northern and northwestern Virginia...and the Panhandle of
West Virginia.

&&
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10 minutes ago, Terpeast said:

Some mid-level cloud cover coming in. What's really interesting is the different directions mid vs. low level clouds are moving... the former is moving westerly, and the latter southerly. That's shear.

Yeah I've been looking for that. I don't see any mid-level clouds right now, although I'm in the city and so visibility is limited. Admittedly, the low-level cumulus are moving pretty quickly to the N/NW. 

I remember 2002, the day of the LaPlata (E?)F4, seeing in Rock Creek Park low-level and mid-level clouds moving pretty quickly in different directions. This was a couple of hours before the LaPlata supercell took off. That memory (I was running there at the time) has stuck with me for some reason.

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Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
356 PM EDT Mon Aug 7 2023

MDC013-021-072030-
/O.CON.KLWX.SV.W.0247.000000T0000Z-230807T2030Z/
Carroll MD-Frederick MD-
356 PM EDT Mon Aug 7 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHWESTERN CARROLL AND NORTH CENTRAL FREDERICK COUNTIES IN
NORTH CENTRAL MARYLAND...

At 353 PM EDT, a severe thunderstorm was located near Thurmont,
moving east at 25 mph.

HAZARD...70 mph wind gusts and ping pong ball size hail.

SOURCE...Trained weather spotters.

IMPACT...Damaging winds will cause some trees and large branches to
         fall. This could injure those outdoors, as well as damage
         homes and vehicles. Roadways may become blocked by downed
         trees. Localized power outages are possible. Unsecured
         light objects may become projectiles.

Locations impacted include...
Thurmont, Emmitsburg, Taneytown, Sabillasville, Harney, Rocky Ridge,
Detour, Keysville and Graceham.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM EDT for north central
Maryland.

For your protection move to an interior room on the lowest floor of a
building.

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature`s leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
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BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
357 PM EDT Mon Aug 7 2023

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  East central Shenandoah County in northwestern Virginia...
  Warren County in northwestern Virginia...
  South central Clarke County in northwestern Virginia...
  Northeastern Page County in northwestern Virginia...
  Northern Rappahannock County in northwestern Virginia...
  Northwestern Fauquier County in northern Virginia...

* Until 445 PM EDT.

* At 357 PM EDT, a severe thunderstorm was located 7 miles southeast
  of Woodstock, moving east at 45 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damaging winds will cause some trees and large branches
           to fall. This could injure those outdoors, as well as
           damage homes and vehicles. Roadways may become blocked by
           downed trees. Localized power outages are possible.
           Unsecured light objects may become projectiles.

* Locations impacted include...
  Front Royal, Hume, Linden, Chester Gap, Flint Hill, Huntly, Arco,
  Compton, Howellsville, Seven Fountains, Dilbeck, Riverton, Fourway,
  Cresthill, Karo, Glen Echo, Bentonville, Blue Mountain, Markham and
  Browntown.
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BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
358 PM EDT Mon Aug 7 2023

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  West central Frederick County in northwestern Virginia...
  East central Hampshire County in eastern West Virginia...

* Until 445 PM EDT.

* At 358 PM EDT, a severe thunderstorm was located 12 miles northwest
  of Winchester, moving northeast at 50 mph.

  THIS IS A DESTRUCTIVE STORM FOR EASTERN HAMPSHIRE AND WESTERN
  FREDERICK COUNTIES.

  HAZARD...80 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable damage to trees and power lines. Your
           life is at significant risk if outdoors. In addition to
           some trees falling into homes, wind damage is possible to
           roofs, sheds, open garages, and mobile homes.

* Locations impacted include...
  Gore, Rock Enon Springs and High View.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM EDT for northwestern
Virginia...and eastern West Virginia.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3917 7843 3928 7845 3934 7834 3920 7829
TIME...MOT...LOC 1958Z 245DEG 44KT 3926 7838

THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...80 MPH
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