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August 2021 Discussion/Obs


George BM
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I don't know what to think about the overnight.    Several of the 00z CAMs bring some heavy rain up through DC and even to those of us further north, but I'm not sure if they really have a handle on everything.    Perhaps they're misplacing the ongoing convection too far north?      That said, the outflow surging north out of southern MD makes me think that things could erupt further north in the next couple of hours.

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7 minutes ago, high risk said:

I don't know what to think about the overnight.    Several of the 00z CAMs bring some heavy rain up through DC and even to those of us further north, but I'm not sure if they really have a handle on everything.    Perhaps they're misplacing the ongoing convection too far north?      That said, the outflow surging north out of southern MD makes me think that things could erupt further north in the next couple of hours.

There is some convection bubbling along the boundary, but whether we get upscale growth is a different question.

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1 minute ago, jacindc said:

Rivers of water in the street gutters but also along the brick sidewalk. Grass between sidewalk and curb now a lake. A time I am glad to literally live on a Hill. This is crazy rain.




Sent from my Pixel 5 using Tapatalk
 

It is like the atmosphere is trying to wring out all of the moisture at once.  Lightning is picking up a bit here on the western Beltway side too.

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1 minute ago, MN Transplant said:

The new FFW is out.  Adjacent to the north of the old one.

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
1242 AM EDT Sun Aug 15 2021

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Warning for...
  District of Columbia...
  Southeastern Montgomery County in central Maryland...
  Northwestern Prince Georges County in central Maryland...
  Northern Arlington County in northern Virginia...
  Central Fairfax County in northern Virginia...
  Prince William County in northern Virginia...
  The City of Fairfax in northern Virginia...
  The City of Falls Church in northern Virginia...
  The City of Manassas in northern Virginia...
  The City of Manassas Park in northern Virginia...

* Until 345 AM EDT.

* At 1242 AM EDT, Doppler radar and automated rain gauges indicated
  thunderstorms producing heavy rain across the warned area. Between
  1 and 2 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...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar and automated gauges.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Arlington...                       Centreville...
  Bethesda...                        Annandale...
  College Park...                    Fairfax...
  Langley Park...                    Vienna...
  Forestville...                     Falls Church...
  Bladensburg...                     Mantua...
  Pimmit Hills...                    Mclean...
  Rosslyn...                         Howard University...
  Fort Totten...                     Gallaudet University...
  RFK Stadium...                     Burke
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9 minutes ago, MN Transplant said:

It is like the atmosphere is trying to wring out all of the moisture at once.  Lightning is picking up a bit here on the western Beltway side too.

That outflow got this all going and whatever lift it caused is squeezing all it can. 

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