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2020 Mid-Atlantic Severe Weather - General Thread


Kmlwx
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Just now, Subtropics said:

Do you have the language in the watch? Winds to 60?

https://www.spc.noaa.gov/products/watch/ww0393.html

 

* Effective this Wednesday afternoon and evening from NOON until
     700 PM EDT.

   * Primary threats include...
     Scattered damaging wind gusts to 70 mph likely
     Isolated large hail events to 1.5 inches in diameter possible

   SUMMARY...Thunderstorms will intensify and over the mountains of
   northern Virginia and southwest Pennsylvania and spread eastward
   this afternoon and early evening.  Damaging winds and perhaps hail
   are expected with the more intense storms today.

   The severe thunderstorm watch area is approximately along and 85
   statute miles east and west of a line from 20 miles south of
   Charlottesville VA to 35 miles north northwest of Harrisburg PA. For
   a complete depiction of the watch see the associated watch outline
   update (WOUS64 KWNS WOU3).
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Just now, Subtropics said:

Do you have the language in the watch? Winds to 60?

URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 393
   NWS Storm Prediction Center Norman OK
   1200 PM EDT Wed Jul 22 2020

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     District Of Columbia
     Western and Central Maryland
     South Central Pennsylvania
     Northern and Central Virginia
     Eastern Panhandle of West Virginia
     Coastal Waters

   * Effective this Wednesday afternoon and evening from NOON until
     700 PM EDT.

   * Primary threats include...
     Scattered damaging wind gusts to 70 mph likely
     Isolated large hail events to 1.5 inches in diameter possible

   SUMMARY...Thunderstorms will intensify and over the mountains of
   northern Virginia and southwest Pennsylvania and spread eastward
   this afternoon and early evening.  Damaging winds and perhaps hail
   are expected with the more intense storms today.
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Just now, H2O said:

https://www.spc.noaa.gov/products/watch/ww0393.html

 


* Effective this Wednesday afternoon and evening from NOON until
     700 PM EDT.

   * Primary threats include...
     Scattered damaging wind gusts to 70 mph likely
     Isolated large hail events to 1.5 inches in diameter possible

   SUMMARY...Thunderstorms will intensify and over the mountains of
   northern Virginia and southwest Pennsylvania and spread eastward
   this afternoon and early evening.  Damaging winds and perhaps hail
   are expected with the more intense storms today.

   The severe thunderstorm watch area is approximately along and 85
   statute miles east and west of a line from 20 miles south of
   Charlottesville VA to 35 miles north northwest of Harrisburg PA. For
   a complete depiction of the watch see the associated watch outline
   update (WOUS64 KWNS WOU3).

 Wow 70 and 1.5 inch hail. Not the typical pity watch. Thank you H2O

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3 minutes ago, Subtropics said:

I feel like I've definitely seen 60 with 3/4 inch hail.

Definitely not saying it hasn't happened - but I thin those numbers are much more common with warnings (before the criteria was changed to 1 inch hail). 

In the old days I remember seeing 65mph a lot too with warnings and watches. But 70 for wind and 1-1.5 for hail is about even with the average severe watch around our parts. 

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7 minutes ago, Kmlwx said:

I may get grazed here in the Hanover/Arundel Mills area unless there is some more development on the northern end. 

Just to south good stuff?

Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
304 PM EDT Wed Jul 22 2020

MDC031-221930-
/O.CON.KLWX.SV.W.0276.000000T0000Z-200722T1930Z/
Montgomery MD-
304 PM EDT Wed Jul 22 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR NORTHWESTERN MONTGOMERY COUNTY...

At 303 PM EDT, severe thunderstorms were located along a line
extending from 7 miles southwest of Green Valley to near Poolesville,
moving east at 20 mph.

HAZARD...Scattered damaging wind gusts up to 70 mph and hail up to
         quarter size.

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, Damascus, Lansdowne, Lowes Island, Poolesville, Boyds,
Clarksburg, Darnestown, Barnesville, Dickerson, Beallsville and
Dawsonville.
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Havent seen a 65mph in a warning from LWX before

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
317 PM EDT Wed Jul 22 2020

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  The District of Columbia...
  Southeastern Montgomery County in central Maryland...
  Western Prince Georges County in central Maryland...
  Arlington County in northern Virginia...
  The City of Falls Church in northern Virginia...
  Eastern Fairfax County in northern Virginia...
  The City of Alexandria in northern Virginia...

* Until 415 PM EDT.

* At 316 PM EDT, severe thunderstorms were located along a line
  extending from near Potomac to near Linton Hall, moving east at 25
  mph.

  HAZARD...Damaging wind gusts up to 65 mph and isolated hail up to
           quarter size.

  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, Alexandria, Bethesda, Bowie, Annandale, Clinton,
  Springfield, College Park, Fort Washington, Greenbelt, Fairfax,
  Langley Park, Beltsville, Fort Hunt, Vienna, Groveton, Forestville,
  Falls Church, Huntington and Coral Hills.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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

&&
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@yoda - They used to use the 65mph level a ton in the 90s and 2000s. Seems they like to use the 10mph intervals now. 

Still not seeing any northern extension. Going to be close for me. I fully expect these clouds will stick around long enough to sour my chance to see the comet tonight.

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Just now, Kmlwx said:

@yoda - They used to use the 65mph level a ton in the 90s and 2000s. Seems they like to use the 10mph intervals now. 

Still not seeing any northern extension. Going to be close for me. I fully expect these clouds will stick around long enough to sour my chance to see the comet tonight.

Interesting.  Wonder what made them change to the 10mph intervals 

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Decent wind in the 40-45 range, a real downpour but the T&L at least in upper NW was better last evening. At least so far; sometimes these storm are backloaded. Pretty ominous look to it as it was coming in. Sky had a slight green tint to it in places but fortunately no hail at least in MBY.

Edit: well now we’re getting some closer-in strokes.

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Nothing really of note around Southern MD either today, bit of lightning here & there...Last night on the other hand was pretty crazy. Pretty sure I caught a direct strike on a transformer, multiple power flashes, etc...definitely the strongest storm we've had down here so far.

Here's a link if you'd like to see it.


 

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No SVR but 2.36", nice T&L and some breezes.

Interestingly enough, yesterday's was nothing in comparison here, just .11" and two cracks of thunder but more gusty. (31 mph peak today vs. yesterday's 42 mph peak)

I was driving through this around 16:45 and passed some serious streams running through the edge of fields.  The ground is so dry here that those deluges unfortunately are running off instead of soaking in.  The backside had a nice round of lighter rains that did give a decent soaking.

1" hail today not 1/4 mile from here.  That's OK, even though 1" isn't too much prefer not to have it.  Nothing tops the five minutes of tennis ball stones and 109mph gust on June 15, 1980 for us.  That's real severe usually more common in the plains...

So far in 2020 this has been the best round of heavier thunderstorms for us.

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