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August Discobs 2020


George BM
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43 minutes ago, yoda said:

Looks like it...

BTW, does radarscope overdo the rotation markers?  Like there is one for the tiny storm by Boyce, VA right now 

     I would say that it does, although I would not be surprised is there is some very weak rotation on the cells tonight, as there is some very modest curvature in the hodographs tonight.

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here come the FFWs

Flood Watch
National Weather Service Baltimore MD/Washington DC
246 AM EDT Thu Aug 6 2020


DCZ001-MDZ004>006-011-013-014-016>018-503>508-VAZ025-036-037-050-
052>057-501-502-505-506-508-062145-
/O.EXB.KLWX.FF.A.0018.000000T0000Z-200807T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
District of Columbia-Frederick MD-Carroll-Northern Baltimore-
Southern Baltimore-Prince Georges-Anne Arundel-Charles-St. Marys-
Calvert-Northwest Montgomery-Central and Southeast Montgomery-
Northwest Howard-Central and Southeast Howard-Northwest Harford-
Southeast Harford-Augusta-Nelson-Albemarle-Orange-
Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-Spotsylvania-
King George-Northern Fauquier-Southern Fauquier-Western Loudoun-
Eastern Loudoun-Central Virginia Blue Ridge-
Including the cities of Washington, Frederick, Ballenger Creek,
Eldersburg, Westminster, Reisterstown, Cockeysville, Baltimore,
Bowie, Suitland-Silver Hill, Clinton, College Park, Greenbelt,
Laurel, Camp Springs, Glen Burnie, Annapolis, Severn, South Gate,
Severna Park, Arnold, Odenton, St. Charles, Waldorf,
Lexington Park, California, Chesapeake Beach, Huntingtown,
Dunkirk, North Beach, Lusby, Prince Frederick, Germantown,
Damascus, Bethesda, Rockville, Gaithersburg, Silver Spring,
Lisbon, Columbia, Ellicott City, Jarrettsville, Aberdeen,
Staunton, Waynesboro, Stuarts Draft, Lovingston, Charlottesville,
Orange, Gordonsville, Dale City, Manassas, Woodbridge,
Lake Ridge, Montclair, Reston, Herndon, Annandale, Centreville,
Chantilly, McLean, Franconia, Arlington, Alexandria,
Falls Church, Falmouth, Fredericksburg, Dahlgren, Warrenton,
Turnbull, Purcellville, Leesburg, Ashburn, Sterling,
and Wintergreen
246 AM EDT Thu Aug 6 2020

...FLASH FLOOD WATCH IN EFFECT THROUGH THIS EVENING...

The National Weather Service in Sterling Virginia has expanded
the

* Flash Flood Watch to include portions of Maryland, The
  District of Columbia, and Virginia, including the following
  areas, in Maryland, Anne Arundel, Calvert, Carroll, Central
  and Southeast Howard, Central and Southeast Montgomery,
  Charles, Frederick, Northern Baltimore, Northwest Harford,
  Northwest Howard, Northwest Montgomery, Prince Georges,
  Southeast Harford, Southern Baltimore, and St. Marys. The
  District of Columbia. In Virginia, Albemarle, Arlington/Falls
  Church/Alexandria, Augusta, Central Virginia Blue Ridge,
  Eastern Loudoun, Fairfax, King George, Nelson, Northern
  Fauquier, Orange, Prince William, Southern Fauquier,
  Spotsylvania, Stafford, and Western Loudoun.

* Through this evening

* Numerous slow moving showers and thunderstorms continue to
  develop across the region and should expand and redevelop with
  time. Locations which are repetitively affected could receive
  multiple-inch rainfall totals. This could lead to rapid rises on
  streams and flash flooding of low lying areas.
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Flood Watch
National Weather Service Baltimore MD/Washington DC
246 AM EDT Thu Aug 6 2020


VAZ026-029-038>040-051-507-062145-
/O.EXT.KLWX.FF.A.0018.000000T0000Z-200807T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Rockingham-Page-Greene-Madison-Rappahannock-Culpeper-
Northern Virginia Blue Ridge-
Including the cities of Harrisonburg, Luray, Shenandoah, Stanley,
Stanardsville, Madison, Washington, Culpeper, and Big Meadows
246 AM EDT Thu Aug 6 2020

...FLASH FLOOD WATCH NOW IN EFFECT THROUGH THIS EVENING...

The Flash Flood Watch is now in effect for

* Portions of central Virginia, northern Virginia, northwest
  Virginia, and western Virginia, including the following areas,
  in central Virginia, Greene. In northern Virginia, Culpeper.
  In northwest Virginia, Madison, Northern Virginia Blue Ridge,
  Page, and Rappahannock. In western Virginia, Rockingham.

* Through this evening

* Numerous slow moving showers and thunderstorms continue to
  develop across the region and should expand and redevelop with
  time. Locations which are repetitively affected could receive
  multiple-inch rainfall totals. This could lead to rapid rises on
  streams and flash flooding of low lying areas.
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20 minutes ago, RDM said:

Yup Yoda - Pouring here now just NW of Vienna.  .3" in just a few mins.  Deluge.  Based on Sterling radar, this is not moving very fast too.  Lawyers Road where we live will probably flood, for the nth time this year.  Anything over about 1"/hr and it floods/closes.  

Seeing flashes of lightning out my window every few seconds but with no thunder... so must be just missing the storm off to my NW where you are

ETA:  Speaking of:

Short Term Forecast
National Weather Service Baltimore MD/Washington DC
314 AM EDT Thu Aug 6 2020

MDZ004-503>505-VAZ053-506-060745-
Central and Southeast Montgomery-Northwest
Montgomery-Frederick-Northwest Howard-Fairfax-Eastern Loudoun-
314 AM EDT Thu Aug 6 2020

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN HOWARD AND
MONTGOMERY COUNTIES IN CENTRAL MARYLAND...SOUTHEASTERN FREDERICK
COUNTY IN NORTH CENTRAL MARYLAND...SOUTHEASTERN LOUDOUN AND
NORTHWESTERN FAIRFAX COUNTIES IN NORTHERN VIRGINIA...

At 313 AM EDT, a strong thunderstorm was located over Herndon, moving
northeast at 25 mph.

Locations impacted include...
Germantown, Rockville, Bethesda, Gaithersburg, Reston, Leesburg,
Olney, Herndon, Vienna, Damascus, Broadlands, Lansdowne, Lowes
Island, Brambleton, Pimmit Hills, Poolesville, American Legion
Bridge, Aspen Hill, Potomac and North Bethesda.

Torrential rainfall is occurring with this storm, and may reduce
visibilities.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
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4 minutes ago, yoda said:

Seeing flashes of lightning out my window every few seconds but with no thunder... so must be just missing the storm off to my NW where you are

ETA:  Speaking of:


Short Term Forecast
National Weather Service Baltimore MD/Washington DC
314 AM EDT Thu Aug 6 2020

MDZ004-503>505-VAZ053-506-060745-
Central and Southeast Montgomery-Northwest
Montgomery-Frederick-Northwest Howard-Fairfax-Eastern Loudoun-
314 AM EDT Thu Aug 6 2020

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN HOWARD AND
MONTGOMERY COUNTIES IN CENTRAL MARYLAND...SOUTHEASTERN FREDERICK
COUNTY IN NORTH CENTRAL MARYLAND...SOUTHEASTERN LOUDOUN AND
NORTHWESTERN FAIRFAX COUNTIES IN NORTHERN VIRGINIA...

At 313 AM EDT, a strong thunderstorm was located over Herndon, moving
northeast at 25 mph.

Locations impacted include...
Germantown, Rockville, Bethesda, Gaithersburg, Reston, Leesburg,
Olney, Herndon, Vienna, Damascus, Broadlands, Lansdowne, Lowes
Island, Brambleton, Pimmit Hills, Poolesville, American Legion
Bridge, Aspen Hill, Potomac and North Bethesda.

Torrential rainfall is occurring with this storm, and may reduce
visibilities.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

You've got a line developing just south of you headed N along I-95.  Should get you in the action soon.  

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Good morning from Mother Nature 

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
433 AM EDT Thu Aug 6 2020

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  Northern Anne Arundel County in central Maryland...

* Until 515 AM EDT.

* At 432 AM EDT, a severe thunderstorm was located over Odenton, or
  near Crofton, 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...
  Severn, Crofton, Riviera Beach, Magothy River, Dobbins Island, Fort
  Smallwood State Park, Pinehurst, Gibson Island, Bodkin Point,
  Sillery Bay, Glen Burnie, Severna Park, Odenton, Pasadena, Arnold,
  Lake Shore, Parole, Fort Meade, Millersville and Green Haven.

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.
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1 hour ago, CAPE said:

Winding down now.

1.52"

Best electrical storm I have seen in years. Amazingly only one brief power blip.

Admiring radar over your area. Incredible !!!  Missed the bulk here but precip totals South of me are 2 inches and over.  

Put those sprinklers into storage .  The rare AM electrical storms are lots of fun !  

Click for latest One Hour Precipitation radar loop from the Dover Air Force Base, DE radar and current weather warnings

 

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Even the end of next week looks to be rather wet according to Mount Holly's  long range outlook. I tend to think if this pattern continues maybe over seeding can commence earlier  this year, rather than after Labor Day, as  @CAPE mentioned .  I keep reading that as the Country dries up  drier weather may settle into the East on a extended basis . However, this change seems to continue to push out further and further into the future.  

 

 From Mount Holly AFD :

  Looks like the late-week period may be interesting, as the front may stall near or in the area, with deterministic models showing multiple rounds of convection occurring in proximity to it. Certainly a heavy-rain threat from a pattern recognition perspective.

 

 

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