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

[Scraff]

Reporting the Elkridge / Columbia line as “safe”.  5 drops of rain. Maybe 6. 

[LP08]

8 minutes ago, MN Transplant said:

Would be nice if some of this built south.  0.09”

Pain

 

But maybe some in a bit.

[yoda]

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.

[09-10 analogy]

It's raining hard, but I've certainly seen heavier. Then again, "heavier" in my head canon is June 2006.

[MN Transplant]

No rain at IAD or DCA while miles away are getting pounded.  Mid-Atlantic summer in action.

[Eskimo Joe]

SVR w/ TOR possible tag coming for Cecil.

[biodhokie]

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.

[Kmlwx]

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. 

[Eskimo Joe]

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.

[Kmlwx]

2 minutes ago, Eskimo Joe said:

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

Piringer said on Twitter burnt food. 

[WeatherShak]

Quite the light show looking north from Alexandria.

[yoda]

11 minutes ago, Eskimo Joe said:

SVR w/ TOR possible tag coming for Cecil.

Tornado Warning Cecil

[yoda]

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

[Eskimo Joe]

TOR for Cecil.

[yoda]

1 minute ago, Eskimo Joe said:

TOR for Cecil.

Canceled

[GramaxRefugee]

Just now, yoda said:

Canceled

Never looked very impressive on radar. Maybe I'm missing something.

Plenty of T&L here, but that's all so far.

[Kmlwx]

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. 

[Stormfly]

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.

[Eskimo Joe]

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.

[mappy]

2 hours ago, Eskimo Joe said:

DRUNK: Reported
HANGOVER: Possible

Yeppers 

[Hank Scorpio]

Lots and lots of cloud to cloud lightning with this little cell moving through Loudoun right now. Good consultation prize after most of the activity from today and yesterday missed in all directions 

[Eskimo Joe]

FFW definitely verified in PG:

 

[Eskimo Joe]

Can see the CG from the Rockville cluster in Reisterstown. 

[Kmlwx]

My PWS lightning count is up to 491 from all this activity. Has tended to estimate low compared to what is reality as well. 

[weatherCCB]

Torrential rain here

got to be over 3’ here so far today

will measure in the morning 

[Eskimo Joe]

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

[yoda]

00z NAM going with some outlandish soundings late Tuesday evening

ETA: looks like nw flow stuff... cause KPIT at 18z has a nasty sounding

[Kmlwx]

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. 

[WEATHER53]

Baltimore to DC was crazy.  Couple 10 second Thunder rumbles in flashes those towering looked 35,000+. Any data on that?

[WEATHER53]

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