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June Discobs 2024

George BM

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6 minutes ago, Interstate said:

That line on the eastern shore is just sitting there... I wonder if it is being helped by some sea breeze.

Got to be. Seabreeze rolling in on the Atlantic side in Rehoboth, but no initiation here for whatever reason.

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14 minutes ago, katabatic said:

Damn. 0.59" in 14 minutes. Needed the rain but that was pretty intense.

Nothing here, but JUST to my west a barely moving storm with red and white radar returns..... I'd say they are getting quite wet. 

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Flood Watch
National Weather Service Baltimore MD/Washington DC
404 AM EDT Wed Jun 5 2024

District of Columbia-Southern Baltimore-Prince Georges-Anne
Arundel-Northwest Montgomery-Central and Southeast Montgomery-
Northwest Howard-Central and Southeast Howard-Fairfax-
Arlington/Falls Church/Alexandria-Eastern Loudoun-Northwest
Prince William-Central and Southeast Prince
William/Manassas/Manassas Park-
Including the cities of Clinton, Annandale, Manassas, Rockville,
Glen Burnie, Severna Park, Dale City, Centreville, Chantilly,
Silver Spring, Washington, Ashburn, Arnold, Annapolis, Falls
Church, Arlington, College Park, McLean, Lake Ridge, Camp
Springs, Reston, Odenton, Germantown, Severn, Franconia,
Gaithersburg, Leesburg, Montclair, Baltimore, Bowie, Columbia,
Herndon, Ellicott City, Sterling, Laurel, Suitland-Silver Hill,
Bethesda, Alexandria, Damascus, Haymarket, South Gate, Lisbon,
Woodbridge, and Greenbelt
404 AM EDT Wed Jun 5 2024


* WHAT...Flash flooding caused by excessive rainfall is possible.

* WHERE...District of Columbia, in Maryland, including the following
  areas, Anne Arundel, Central and Southeast Howard, Central and
  Southeast Montgomery, Northwest Howard, Northwest Montgomery,
  Prince Georges and Southern Baltimore, and in northern Virginia,
  including the following areas, Arlington/Falls Church/Alexandria,
  Central and Southeast Prince William/Manassas/Manassas Park,
  Eastern Loudoun, Fairfax and Northwest Prince William.

* WHEN...From noon EDT today through this evening.

* IMPACTS...Excessive runoff may result in flooding of rivers,
  creeks, streams, and other low-lying and flood-prone locations.
  Flooding may occur in poor drainage and urban areas. Low-water
  crossings may be flooded.

  - Multiple rounds of heavy showers and thunderstorms will move
    across the area today into this evening. Rainfall amounts of
    1 to 2 inches are likely, with isolated amounts of 3 to 4
    inches possible.
  - Please visit www.weather.gov/safety/flood for flood safety
    and preparedness information
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From this morning LWX AFD re heavy rain threat

Flash Flood Threat: This is likely to be the biggest threat of the
day as multiple rounds of showers and thunderstorms move across the
area. WPC has expanded the Slight Risk of flooding to encompass most
areas along/north of I-66, the northern Shenandoah Valley, and
Alleghenies. Widespread rainfall amounts of 1-2 inches is likely,
with isolated amounts up to 3-4 inches is possible.

A very important feature to watch is the subtle surface boundary
located from Central VA to around Norfolk early this morning. The
increasing southerly flow will push this boundary north into our
area this afternoon, likely somewhere along or north of the Potomac
River. Storms today are likely to be efficient rain producers given
the deep warm cloud layer, a moist airmass, sufficient shear, and
low-level convergence into the previously mentioned boundary. While
mean storm motion is likely to be fast, around 15-20 knots, the
multiple rounds of heavy rain could cause issues in urban areas.

The 00Z guidance shows the potential for locally heavy rainfall, but
exactly where that occurs remains to be seen. The heavy rain
footprint various still varies quite a bit from model to model,
which is expected in this type of disorganized/cluster storm mode.
Given the sensitivities of the DC and Baltimore metros, a targeted
Flood Watch has been issued from 12PM today through tonight to
account for possible flash flooding due to multiple rounds of
storms. Elsewhere, FFG values are high enough and convection spaced
out enough that a Flood Watch is not warranted at this time.
However, the current watch may be expanded later today depending on
future model data.
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