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George BM

September Discobs 2020

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Just now, snowfan said:

Forecast seems a mess today. Started the day expecting off/on rain all day, then it seemed like everything was sliding to the NE and we'd dry out, now we've got flash flooding and a lot in the metro area getting pummeled.

Reverse bust. We were due.

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Flash Flood Statement
National Weather Service Baltimore MD/Washington DC
239 PM EDT Thu Sep 10 2020

DCC001-MDC031-101945-
/O.CON.KLWX.FF.W.0062.000000T0000Z-200910T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
District of Columbia DC-Montgomery MD-
239 PM EDT Thu Sep 10 2020

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM EDT THIS
AFTERNOON FOR SOUTHEASTERN MONTGOMERY COUNTY AND THE NORTHWESTERN
DISTRICT OF COLUMBIA...

At 239 PM EDT, emergency management reported several occurrences of
flash flooding in the area, along with water rescues reported on
Beach Drive. Additionally, Rock Creek is above flood stage
throughout Rock Creek Park and continuing to rise rapidly. Between 2
and 5 inches of rain have fallen. Flash flooding is already
occurring.

HAZARD...Life threatening flash flooding. Heavy rain producing
         flash flooding.

SOURCE...Emergency management.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that may experience flash flooding include...
Arlington...                       Rockville...
Bethesda...                        Gaithersburg...
Olney...                           Aspen Hill...
Potomac...                         North Bethesda...
North Potomac...                   Redland...
Colesville...                      Kemp Mill...
Chevy Chase...                     North Kensington...
South Kensington...                Forest Glen...
Martin`s Additions...              North Chevy Chase...
Rossmoor...                        Wheaton-Glenmont...

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Wow at the bolded in teh afternoon AFD... 5" of rain in 90 mins -- but unofficial for now

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
228 PM EDT Thu Sep 10 2020

.SYNOPSIS...
A cold front will drop south of the area through the first part
of the weekend, then return northward as a warm front Sunday.
Another cold front will likely impact the area early next week.

&&

.NEAR TERM /THROUGH TONIGHT/...
A surface trough between an approaching cold front from the west
and a tropical disturbance offshore has resulted in a band of
heavy showers and thunderstorms right up and down I-95 from near
Laurel, Maryland, through the immediate Washington DC metro area
southward into western Charles County, Maryland. Additional
showers and thunderstorms will likely develop on either side of
this axis through nightfall, with additional flash flooding
likely. Rainfall amounts (preliminary, unofficial) of up to 5
inches have been reported in a span of 90 minutes. This is
occurring due to deep, abundant tropical moisture with PWs near
2.5 inches and high/deep warm cloud layers.

Activity should gradually diminish this evening, though some
local expansions/extensions of the Flash Flood Watch may be
necessary. Remember, do not drive around barricades or across
flooded roadways.

Some patchy fog and drizzle is likely overnight with a moist
atmosphere and not much wind as the front sits overhead.

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2 minutes ago, DCTeacherman said:

This is Jackson ave in Takoma park. 

What address block is that?

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2 minutes ago, Subtropics said:

Reverse bust. We were due.

The chance for excessive rain today was forecast yesterday for the area. Models struggle with pinpointing the exact locations where the heavy rain will occur given subtle forcing mechanisms and weak flow aloft. There is no bust here.

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
244 PM EDT THU SEP 10 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0238 PM     FLASH FLOOD      HYATTSVILLE             38.96N  76.95W
09/10/2020                   PRINCE GEORGES     MD   FIRE DEPT/RESCUE

            MULTIPLE WATER RESCUES IN THE HYATTSVILLE, MOUNT
            RAINER, AND BRENTWOOD AREAS.


&&

EVENT NUMBER LWX2002460

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holy shit at some yalls rain totals. 

.07 so far at my house today

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1 minute ago, midatlanticweather said:

Ditto! Not much of anything! 

 

I say that right as the sky opens up. There has been stuff to my west for the last hour or so but just hadnt made it this way. 

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Looks like a bust around these parts. That area of extremely heavy rain just rained itself out. Looks like some good rain forming in Southern MD but heading well east of here.

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4 minutes ago, Eskimo Joe said:

My weather station comes tomorrow...it pours today. Ironic.

Would have loved to have those personal stats recorded...

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Pouring here but its pretty scattered for now.

1.15"

Much of that fell this morning as a moderate rain. Hoping to miss the really heavy stuff.

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12 minutes ago, MN Transplant said:

That N/S train was like a mini-Lee.  

Love me some N/S slow moving trains. We don't get those enough around here. Too much west to east garbage.

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