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July Discobs Thread


George BM
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Flood Watch
National Weather Service Baltimore MD/Washington DC
1135 AM EDT Sun Jul 22 2018

DCZ001-MDZ004>006-011-013-014-016>018-503>508-VAZ052>057-506-
222345-
/O.NEW.KLWX.FF.A.0014.180722T1700Z-180723T0400Z/
/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-Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-Spotsylvania-
King George-Eastern Loudoun-
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,
Dale City, Manassas, Woodbridge, Lake Ridge, Montclair, Reston,
Herndon, Annandale, Centreville, Chantilly, McLean, Franconia,
Arlington, Alexandria, Falmouth, Fredericksburg, Dahlgren,
Leesburg, Ashburn, and Sterling
1135 AM EDT Sun Jul 22 2018

...FLASH FLOOD WATCH IN EFFECT THROUGH MIDNIGHT EDT TONIGHT...

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Watch for the District of Columbia and portions of
  Maryland and Virginia, including the following areas, in
  Maryland, Anne Arundel, Calvert, Carroll, Central and Southeast
  Howard, Central and Southeast Montgomery, Charles, Frederick MD,
  Northern Baltimore, Northwest Harford, Northwest Howard,
  Northwest Montgomery, Prince Georges, Southeast Harford,
  Southern Baltimore, and St. Marys. In Virginia, Arlington/Falls
  Church/Alexandria, Eastern Loudoun, Fairfax, King George,
  Prince William/Manassas/Manassas Park, Spotsylvania, and
  Stafford.

* Through midnight EDT tonight.

* Showers and thunderstorms will be likely this afternoon and
  evening. There is potential for repetitive rounds of
  precipitation. Combined with saturated ground and high stream
  levels from Saturday`s rainfall, this precipitation could lead
  to flash flooding.

* Urban areas, locations along small streams and creeks, and poor
  drainage areas are most vulnerable to flash flooding.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.
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13 minutes ago, JWilliam9830 said:

Looks like C.A.P.E almost gets shafted. Right on the edge of the slight risk.

Yeah I am pretty much right in the middle between the moderate and slight contours. Those products are not meant to be precise, and as we saw yesterday they continually update based on latest trends. That being said, I just missed that heavy line of showers that developed just to my SW in the last hour- it moved N and slightly NW. Seems most of the action will be to my west today.

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12 minutes ago, JWilliam9830 said:

Some good CAPE values and lifted indices east of the Chesapeake bay that are increasing. Wouldn't be surprised if they expand the slight risk and the MDT risk a little east

Been quite sunny here this morning, except when that line a few miles west of here passed by, but back to mostly sunny now. In general the location of the upper low to the west and the blocking ridge to the east are going to dictate where any minor upper level perturbations might track and contribute to heavy rain potential- and it looks like it is favored to be over the same areas that got crushed yesterday.

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The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  Southeastern Prince Georges County in central Maryland...
  Northeastern Charles County in southern Maryland...

* Until 215 PM EDT.

* At 144 PM EDT, a severe thunderstorm was located near Waldorf,
  moving north at 45 mph.

  HAZARD...60 mph wind gusts.

  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...
  Waldorf, Clinton, Forestville, La Plata, Upper Marlboro, Andrews
  Air Force Base, Camp Springs, Oxon Hill, Rosaryville, Friendly,
  Marlton, Temple Hills, Marlow Heights, Saint Charles, Accokeek,
  Brandywine, Hughesville, Baden, Morningside and Aquasco.
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BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
217 PM EDT SUN JUL 22 2018

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  Anne Arundel County in central Maryland...
  Northeastern Prince Georges County in central Maryland...

* Until 300 PM EDT.

* At 217 PM EDT, severe thunderstorms were located along a line
  extending from Bowie to near Kettering to near Dunkirk, moving
  north at 30 mph.

  HAZARD...60 mph wind gusts.

  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...
  Bowie, Severn, Annapolis, Crofton, Riviera Beach, Mayo, Shady Side,
  Naval Academy, Baltimore-Washington Airport, Severn River, South
  River, Fort Smallwood State Park, Gibson Island, Bodkin Point,
  Sillery Bay, Rhode River, Pinehurst, Glen Burnie, Severna Park and
  Odenton.
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