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September Discobs 2021


George BM
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WTOP interrupted again by NWS.

Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
531 PM EDT Thu Sep 16 2021

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Warning for...
  Southeastern Fairfax County in northern Virginia...
  The Southern City of Alexandria in northern Virginia...

* Until 830 PM EDT.

* At 531 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Between 2 and 3 inches of rain
  have fallen. Additional rainfall amounts of 1 to 2 inches are
  possible in the warned area. Flash flooding is ongoing or expected
  to begin shortly.

(snip)

 

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The flash flood warning just got expanded.

Flash Flood Statement
National Weather Service Baltimore MD/Washington DC
541 PM EDT Thu Sep 16 2021

District of Columbia DC-Arlington VA-Fairfax VA-City of Alexandria
VA-City of Falls Church VA-
541 PM EDT Thu Sep 16 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 PM EDT THIS EVENING
FOR ARLINGTON AND EAST CENTRAL FAIRFAX COUNTIES AND THE SOUTHWESTERN
DISTRICT OF COLUMBIA, THE CITY OF ALEXANDRIA AND THE CITY OF FALLS
CHURCH...

At 541 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rainfall along with numerous reports
of high water and flooded roadways across the warned area. Between 2
and 3 inches of rain have fallen. Additional rainfall amounts of 1
to 2 inches are possible in the warned area. Flash flooding is
ongoing or expected to begin shortly.
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1 hour ago, WinterWxLuvr said:

Those “above normal heat for the foreseeable future” and “OMG it’s summer until October” posts don’t look too good right about now”.

Lol

People never learn that long-range looks are volatile as hell and can't be taken verbatim. That said...bring on that 06z GFS look! :lol:

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Local CoCoRaHs reported 1.60" from yesterday. Makes a lot of sense compared to the radar estimates of 0.80", which were obviously too low just based on how hard it rained for some of the time.

Again...the wind was really impressive and it was a lot more consistent than most of your standard thunderstorms.

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15 minutes ago, GramaxRefugee said:

Missed almost everything yesterday and overnight, (a few sprinkles).  Now getting some gentle, steady rain for the morning.  

We always seem to finish with some back-side development with lows off the coast. Despite the fact that we generally suck at winter, we often see light snow stick around over our area as lows pull away, and we've certainly seen the same with coastal-type lows in the "rainy season."

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  • WxUSAF unpinned this topic

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