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2023 Mid-Atlantic Severe Wx Thread (General Discussion)


Kmlwx
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the blob is not in any big hurry, if it stays together there will be some decent rainfall totals for those underneath it.  Cell movement started out S briefly, has gradually turned left and is now reported as a slight ENE movement, such as it is.  Edit:  plus there could be a bit of training effect if/when the stuff further west comes though.

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MoCo cell is taking it's sweet time - probably going to be some healthy rain totals under it. radar getting messy between the MoCo cells and the big blob to the west as more little cells try to form. I'm guessing the MoCo cell is going to stabilize things so that the stuff behind will be weaker. 

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Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
502 PM EDT Fri Jul 14 2023

MDC021-VAC107-142115-
/O.CON.KLWX.SV.W.0131.000000T0000Z-230714T2115Z/
Frederick MD-Loudoun VA-
502 PM EDT Fri Jul 14 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR SOUTHWESTERN FREDERICK COUNTY IN NORTH CENTRAL MARYLAND AND NORTH
CENTRAL LOUDOUN COUNTIES IN NORTHERN VIRGINIA...

At 501 PM EDT, severe thunderstorms were located along a line
extending from near Brunswick to near Bluemont, moving southeast at
25 mph.

HAZARD...70 mph wind gusts.

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...
Purcellville, Round Hill, Lovettsville, Hamilton, Hillsboro, Paeonian
Springs, Waterford, Philomont, Lucketts, Lincoln, Hughesville and
Taylorstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

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

&&

LAT...LON 3906 7778 3911 7782 3928 7771 3926 7747
      3903 7769
TIME...MOT...LOC 2101Z 297DEG 20KT 3924 7766 3908 7779

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
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Severe Thunderstorm Warning
MDC031-VAC107-142145-
/O.NEW.KLWX.SV.W.0133.230714T2107Z-230714T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
507 PM EDT Fri Jul 14 2023

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  West central Montgomery County in central Maryland...
  Northeastern Loudoun County in northern Virginia...

* Until 545 PM EDT.

* At 507 PM EDT, a severe thunderstorm was located near Purcellville,
  or near Leesburg, moving east at 25 mph.

  HAZARD...60 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...
  Germantown, Leesburg, Lansdowne, Lowes Island, Poolesville,
  Ashburn, Countryside, Boyds, Clarksburg, Darnestown, Belmont,
  Barnesville, Paeonian Springs, Waterford, Lucketts, Dickerson,
  Beallsville, Dawsonville and Hughesville.

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 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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
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5 minutes ago, AmericanWxFreak said:

These seem to have some bit of SE trajectory - Columbia about to get missed S?

Need a couple more radar cycles. Those storms are just developing so hard to say which way they’re moving. And wouldn’t shock me at all if more develop over us. 

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Here it comes 

the corn dust I discussed recently ate up the light stuff which moved  north and around the beltway circle.  Corn dust is limited to turning light rain or snow to nothing or moderate to light.  Once the precip is solid moderate or stronger the the dust has no effects

 

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Lotta lightning off to the N&W. According to Ventusky, there's a bit of a surface low (29.9) reflection NW of Germantown, but I don't really see it on the SPC Mesoanalysis. 

Anyway, DC is now severe warned:

Severe Thunderstorm Warning

Severe Thunderstorm Warning
DCC001-MDC031-033-VAC013-059-142230-
/O.NEW.KLWX.SV.W.0135.230714T2138Z-230714T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
538 PM EDT Fri Jul 14 2023

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  The District of Columbia...
  Southeastern Montgomery County in central Maryland...
  Northern Prince Georges County in central Maryland...
  Northern Arlington County in northern Virginia...
  Northeastern Fairfax County in northern Virginia...

* Until 630 PM EDT.

* At 538 PM EDT, a severe thunderstorm was located over American
  Legion Bridge, moving east at 35 mph.

  HAZARD...60 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...
  Arlington, Rockville, Bethesda, Bowie, Olney, College Park,
  Greenbelt, Langley Park, Beltsville, Forestville, Falls Church,
  Largo, Coral Hills, Bladensburg, Pimmit Hills, Mclean, Fedex Field,
  Fort Totten, Rosslyn and University of Maryland.

 

ETA: Ugh. Showers out ahead of the storm. Don't like that. 

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