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August Discobs 2020


George BM
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WATCH COUNTY NOTIFICATION FOR WATCH 464
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
138 PM EDT FRI AUG 28 2020

DCC001-MDC001-003-005-009-013-017-021-025-027-031-033-043-510-
VAC013-043-059-069-107-153-510-600-610-683-685-840-WVC003-027-037-
057-065-290000-
/O.CON.KLWX.SV.A.0464.000000T0000Z-200829T0000Z/

SEVERE THUNDERSTORM WATCH 464 REMAINS VALID UNTIL 8 PM EDT THIS
EVENING FOR THE FOLLOWING AREAS

THE DISTRICT OF COLUMBIA

IN MARYLAND THIS WATCH INCLUDES 13 COUNTIES

IN CENTRAL MARYLAND

ANNE ARUNDEL          HOWARD                MONTGOMERY
PRINCE GEORGES

IN NORTH CENTRAL MARYLAND

CARROLL               FREDERICK             WASHINGTON

IN NORTHERN MARYLAND

BALTIMORE             BALTIMORE CITY        HARFORD

IN SOUTHERN MARYLAND

CALVERT               CHARLES

IN WESTERN MARYLAND

ALLEGANY

IN VIRGINIA THIS WATCH INCLUDES 12 COUNTIES

IN NORTHERN VIRGINIA

ARLINGTON             CITY OF ALEXANDRIA    CITY OF FAIRFAX
CITY OF FALLS CHURCH  CITY OF MANASSAS
CITY OF MANASSAS PARK                       FAIRFAX
LOUDOUN               PRINCE WILLIAM

IN NORTHWEST VIRGINIA

CITY OF WINCHESTER    CLARKE                FREDERICK

IN WEST VIRGINIA THIS WATCH INCLUDES 5 COUNTIES

IN EASTERN WEST VIRGINIA

HAMPSHIRE             MINERAL

IN PANHANDLE WEST VIRGINIA

BERKELEY              JEFFERSON             MORGAN

THIS INCLUDES THE CITIES OF ABERDEEN, ALEXANDRIA, ANNAPOLIS,
ARLINGTON, ARNOLD, ASPEN HILL, BALLENGER CREEK, BALTIMORE,
BEL AIR, BERRYVILLE, BETHESDA, BOWIE, CAMP SPRINGS, CATONSVILLE,
CHANTILLY, CHARLES TOWN, CHESAPEAKE BEACH, CLINTON, COLLEGE PARK,
COLUMBIA, CUMBERLAND, DUNDALK, DUNKIRK, EDGEWOOD, ELDERSBURG,
ELLICOTT CITY, ESSEX, FAIRFAX, FALLS CHURCH, FALLSTON,
FORT ASHBY, FREDERICK, FROSTBURG, GAITHERSBURG, GERMANTOWN,
GLEN BURNIE, GREENBELT, HAGERSTOWN, HAVRE DE GRACE, HERNDON,
HUNTINGTOWN, JOPPATOWNE, KEYSER, LAUREL, LEESBURG, LUSBY,
MANASSAS, MANASSAS PARK, MARTINSBURG, MCLEAN, NORTH BEACH,
ODENTON, PARKVILLE, PAW PAW, PIKESVILLE, POTOMAC,
PRINCE FREDERICK, RANDALLSTOWN, RESTON, ROCKVILLE, ROMNEY,
SEVERN, SEVERNA PARK, SHEPHERDSTOWN, SILVER SPRING, SOUTH GATE,
ST. CHARLES, STERLING, SUITLAND-SILVER HILL, TOWSON, WALDORF,
WASHINGTON, WESTMINSTER, WINCHESTER, WINCHESTER, AND WOODBRIDGE.

$$
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Flood Watch
National Weather Service Baltimore MD/Washington DC
459 PM EDT Fri Aug 28 2020


DCZ001-MDZ011-013-014-503>506-VAZ027>031-038>040-051>054-501-502-
505>507-290500-
/O.NEW.KLWX.FF.A.0026.200828T2100Z-200829T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
District of Columbia-Southern Baltimore-Prince Georges-
Anne Arundel-Northwest Montgomery-
Central and Southeast Montgomery-Northwest Howard-
Central and Southeast Howard-Shenandoah-Frederick VA-Page-Warren-
Clarke-Greene-Madison-Rappahannock-Culpeper-
Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Northern Fauquier-
Southern Fauquier-Western Loudoun-Eastern Loudoun-
Northern Virginia Blue Ridge-
Including the cities of Washington, Baltimore, Bowie,
Suitland-Silver Hill, Clinton, College Park, Greenbelt, Laurel,
Camp Springs, Glen Burnie, Annapolis, Severn, South Gate,
Severna Park, Arnold, Odenton, Germantown, Damascus, Bethesda,
Rockville, Gaithersburg, Silver Spring, Lisbon, Columbia,
Ellicott City, Strasburg, Woodstock, Mount Jackson, New Market,
Winchester, Luray, Shenandoah, Stanley, Front Royal, Berryville,
Stanardsville, Madison, Culpeper, Dale City, Manassas,
Woodbridge, Lake Ridge, Montclair, Reston, Herndon, Annandale,
Centreville, Chantilly, McLean, Franconia, Arlington, Alexandria,
Falls Church, Warrenton, Turnbull, Purcellville, Leesburg,
Ashburn, Sterling, and Big Meadows
459 PM EDT Fri Aug 28 2020

...FLASH FLOOD WATCH IN EFFECT UNTIL 4 AM EDT SATURDAY...

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Watch for portions of Maryland, The District of
  Columbia, and Virginia, including the following areas, in
  Maryland, Anne Arundel, Central and Southeast Howard, Central
  and Southeast Montgomery, Northwest Howard, Northwest
  Montgomery, Prince Georges, and Southern Baltimore. The
  District of Columbia. In Virginia, Arlington/Falls
  Church/Alexandria, Clarke, Culpeper, Eastern Loudoun, Fairfax,
  Frederick, Greene, Madison, Northern Fauquier, Northern
  Virginia Blue Ridge, Page, Prince William, Rappahannock,
  Shenandoah, Southern Fauquier, Warren, and Western Loudoun.

* Until 4 AM EDT Saturday

* Scattered to numerous showers and thunderstorms are expected
  this evening into the overnight hours. Some of the showers and
  thunderstorms will produce heavy rainfall, with localized
  amounts between 2 and 4 inches likely.

* Potential impacts include rapid rises of water, flooded roads,
  and flooding of structures in low lying areas near streams.

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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Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
552 PM EDT Fri Aug 28 2020

.SYNOPSIS...
A surface trough will persist near I-95 through tonight.
Meanwhile, the remnants of Laura will merge with a cold front
over the Ohio River Valley tonight, then cross the Middle
Atlantic on Saturday. Canadian high pressure will build in
Sunday into Monday. A few frontal systems will likely impact the
area during the middle to latter portions of next week.

&&

.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
A Flash Flood Watch has been issued until 4 AM for areas along
the I-66/US-50 corridor and then up along I-95 into Baltimore.
We`re growing concerned that flooding may occur as ongoing
storms drop an E-W oriented outflow boundary southward. As the
trough to our west approaches, and we start to feel it`s
influence, flow at 850 hPa is expected to turn southerly and
start to overrun/warm advect atop the stalling outflow boundary.
With flow aloft paralleling the boundary, the potential is there
for training of storms along and north of the outflow boundary
this evening into the overnight hours. The HRRR and NAM show a
narrow stripe of 2-6 inches of rain within the Flash Flood
Watch in the vicinity of the stalled boundary between roughly 00
and 06z. By late tonight, low-level southerly flow will further
increase in advance of the trough/remnants of Laura, causing
the boundary and associated warm advection precipitation to its
north to break out of a stalled position and lift northward.

 

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