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2021 Mid-Atlantic Severe Weather - General Discussion


Kmlwx
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3 hours ago, Eskimo Joe said:

Given the amount of DCAPE and strong sunshine today, I'm surprise we aren't in a DY1 slight risk. There's another kicker working through the region this afternoon and it might yield similar results to yesterday.

from your mouth to SPC's ears

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9 minutes ago, dailylurker said:

It has that lots of lightning feel to it today. I have a feeling some cool lightning is in the works for later. 

IMO, thunderstorms thrive in hot/humid conditions, so wouldn't surprise me to see more lightning out of storms that pop up. 

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3 minutes ago, Eskimo Joe said:

60% chance of a WW this afternoon.

            I definitely expect one.    Totally agree with SPC that the shear is completely lame, but it's clear that we have a shortwave approaching at the right time of day into an environment with good instability and downdraft CAPE.    And the fact that yesterday overperformed in a fairly similar setup will definitely factor in to the decision to box us.

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SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 425
NWS STORM PREDICTION CENTER NORMAN OK
200 PM EDT WED AUG 11 2021

SEVERE THUNDERSTORM WATCH 425 IS IN EFFECT UNTIL 900 PM EDT
FOR THE FOLLOWING LOCATIONS

VAC003-007-009-011-013-015-019-023-025-029-031-033-035-036-037-
041-043-045-047-049-053-057-059-061-063-065-067-069-075-079-083-
085-087-089-097-099-101-107-109-111-113-117-121-125-127-135-137-
139-141-143-145-147-149-153-157-159-161-163-165-171-177-179-187-
193-510-530-540-570-590-600-610-630-640-660-670-678-680-683-685-
690-730-750-760-770-775-790-820-840-120100-
/O.NEW.KWNS.SV.A.0425.210811T1800Z-210812T0100Z/

VA
.    VIRGINIA COUNTIES INCLUDED ARE

ALBEMARLE            AMELIA              AMHERST
APPOMATTOX           ARLINGTON           AUGUSTA
BEDFORD              BOTETOURT           BRUNSWICK
BUCKINGHAM           CAMPBELL            CAROLINE
CARROLL              CHARLES CITY        CHARLOTTE
CHESTERFIELD         CLARKE              CRAIG
CULPEPER             CUMBERLAND          DINWIDDIE
ESSEX                FAIRFAX             FAUQUIER
FLOYD                FLUVANNA            FRANKLIN
FREDERICK            GOOCHLAND           GREENE
HALIFAX              HANOVER             HENRICO
HENRY                KING AND QUEEN      KING GEORGE
KING WILLIAM         LOUDOUN             LOUISA
LUNENBURG            MADISON             MECKLENBURG
MONTGOMERY           NELSON              NEW KENT
NOTTOWAY             ORANGE              PAGE
PATRICK              PITTSYLVANIA        POWHATAN
PRINCE EDWARD        PRINCE GEORGE       PRINCE WILLIAM
RAPPAHANNOCK         RICHMOND            ROANOKE
ROCKBRIDGE           ROCKINGHAM          SHENANDOAH
SPOTSYLVANIA         STAFFORD            WARREN
WESTMORELAND


VIRGINIA INDEPENDENT CITIES INCLUDED ARE

ALEXANDRIA           BUENA VISTA         CHARLOTTESVILLE
COLONIAL HEIGHTS     DANVILLE            FAIRFAX
FALLS CHURCH         FREDERICKSBURG      GALAX
HARRISONBURG         HOPEWELL            LEXINGTON
LYNCHBURG            MANASSAS            MANASSAS PARK
MARTINSVILLE         PETERSBURG          RADFORD
RICHMOND             ROANOKE             SALEM
STAUNTON             WAYNESBORO          WINCHESTER
$$
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Looks like a big downburst could be coming with this one - 

 

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
249 PM EDT Wed Aug 11 2021

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  West central Loudoun County in northern Virginia...
  Southeastern Warren County in northwestern Virginia...
  Southeastern Clarke County in northwestern Virginia...
  Northeastern Rappahannock County in northwestern Virginia...
  Northwestern Fauquier County in northern Virginia...

* Until 330 PM EDT.

* At 249 PM EDT, a severe thunderstorm was located near Hume, or 8
  miles southeast of Front Royal, moving east at 5 mph.

  HAZARD...Golf ball size hail and 70 mph wind gusts.

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2 minutes ago, Kmlwx said:

Outflow evident on radar near Warrenton. Would expect everything behind that to be more of a heavy rain threat for now. 

Cells to watch now are up near Boonsboro, and then any new developing ones. 

We're primed here east of DC. Super hot and steamy. Just waiting on a tiny trigger. 

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We've talked anecdotally about it in years past - but radar kind of looks like the longggg lines of continuous storms from the 90s and early 2000s. That kicker @Eskimo Joe - mentioned earlier today is definitely putting the work in thus far. We'll see what happens to the east...the HRRR kind of had a tendency to kill off storms as they approached the metros - but IMO it hasn't been great the past few days. Perhaps the pulsey nature is throwing guidance for a loop a bit with no organized trigger. 

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1 minute ago, mappy said:

wonder if anyone got the EAS alert that's supposed to be issued for storms with winds 80 or above

Probably not a ton of population out there. I went to a cabin in Sperryville a few years ago and barely could get one bar unless I was on top of the ridge. I think they've added a cell tower in recent years...

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1 minute ago, Kmlwx said:

We've talked anecdotally about it in years past - but radar kind of looks like the longggg lines of continuous storms from the 90s and early 2000s. That kicker @Eskimo Joe - mentioned earlier today is definitely putting the work in thus far. We'll see what happens to the east...the HRRR kind of had a tendency to kill off storms as they approached the metros - but IMO it hasn't been great the past few days. Perhaps the pulsey nature is throwing guidance for a loop a bit with no organized trigger. 

       I think that the issue with the HRRR being dry today (and for the past couple of days) is that it's overmixing the boundary layer, and the dew points out ahead of the storms are too low.   

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2 minutes ago, high risk said:

       I think that the issue with the HRRR being dry today (and for the past couple of days) is that it's overmixing the boundary layer, and the dew points out ahead of the storms are too low.   

Know you've mentioned this in past events too. Something is whacky with my hygrometer it seems - reading an 84 Td right now ;)

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Latest radar interpretation:

Cell heading for Culpeper is pretty nice looking. And the Boonsboro area cell still is packing a punch. Purcellville cell has a hail marker now - so that may be pulsing up. Everything between there and the Culpeper cell, though looks meh.

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