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2022 Mid-Atlantic Severe Wx Thread (General Discussion Etc)


Kmlwx
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2 minutes ago, MN Transplant said:

Surprised we don’t have a FFW for northern DC/Silver Spring

Just issued

 

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
901 PM EDT Sat Jul 2 2022

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Warning for...
  Northwestern District of Columbia...
  Southeastern Montgomery County in central Maryland...
  Northwestern Prince Georges County in central Maryland...
  North Central Arlington County in northern Virginia...
  Northeastern Fairfax County in northern Virginia...

* Until midnight EDT.

* At 901 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Between 2 and 3 inches of rain
  have fallen. Additional rainfall amounts of 1 to 2 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...
  Arlington...                       Bethesda...
  College Park...                    Greenbelt...
  Langley Park...                    Beltsville...
  Pimmit Hills...                    Fort Totten...
  University of Maryland...          Mclean...
  American Legion Bridge...          Potomac...
  Tysons Corner...                   Hyattsville...
  White Oak...                       Takoma Park...
  East Riverdale...                  Adelphi...
  Kemp Mill...                       Chevy Chase...

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.

Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
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1 minute ago, biodhokie said:

Non-stop fire sirens in Silver Spring. Makes me wonder if multiple water rescues are needed since people weren't turning around when I saw flooded roads.

Montgomery put a hi-rise box alarm out at the 1400 blk of East-West Hwy.

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15 minutes ago, Kmlwx said:

0z HRRR keeps activity forming overnight - appears non-severe of course, but some areas could still be in the game for some quick downpours even as late as 10z. 

Don't really see anything forming west of where the stuff us right now in DC and NE MD on radar attm

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1 hour ago, nw baltimore wx said:

Damn. Probably should be inside. Check out this feeler trying to get to us on the porch.

 

 

Great capture!

That would be a lens reflection.  You can make it that it mirrors the bolt and the predominately green wavelength depicted is indicative of remnants of the coating used.

I've seen these many times in videos and some even appear real as the sound in the video reveals a snapping noise.  However the snapping noise is from sideflashes occurring from nearby conductors that picked up enough potential from the nearby strike to arc over to conductive objects of lower potential.  Interestingly enough, energy from those sideflashes often find their way into sensitive electronic equipment often bypassing spike protection in the power supply usually due to alternate paths.

Bolts that long, that close are extremely sharp/loud similar to a centerfire rifle cartridge.  Running a Tesla coil at a "lowly" (in comparison) 50kW input with a secondary coil (magnifier), frequent D'Arsonval discharges were experienced that were about 15-20' long and were quite loud even with ear protection.

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12 minutes ago, Kmlwx said:

Backbuilding/new cells developing back towards Seneca in Montgomery Co. Will reinforce any small creek/urban flood threat . Even a minor hail marker showing on the TIAD scans. 

Per USGS Sensor, Sligo Creek @ Takoma Park about to hit minor flood stage.

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15 minutes ago, Eskimo Joe said:

FFW within a FFW for Montgomery. Been dry enough that we could escape any big issues.

Radar just keeps blossoming for MoCo. If this keeps up it could get a bit more serious. 

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10 minutes ago, Kmlwx said:

Radar just keeps blossoming for MoCo. If this keeps up it could get a bit more serious. 

Watch the radar intervals every 10-15 minutes it fades and next 10-15 refires then fades then fires 

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