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2023 Mid-Atlantic Severe Wx Thread (General Discussion)


Kmlwx
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43 minutes ago, NorthArlington101 said:

Strange looking radar the past 20 minutes or so. Regardless of exactly why, seems like these storms are struggling to take off

suns out. Rainbow at least lol

Arguably, the best part are the breezes left in the wake of the small cells that went to our NE. Soooo nice sitting in backyard right now, under the clearest/bluest skies we've had all day.

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SPC Mesoanalysis shows > 3500 SBCAPE and > 30 kts of bulk shear. Are we just failing to get a reliable lifting mechanism? That little boundary that passed through seemed to act as one, but the cells still had trouble surviving.

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5 minutes ago, Moosey2323 said:

SPC Mesoanalysis shows > 3500 SBCAPE and > 30 kts of bulk shear. Are we just failing to get a reliable lifting mechanism? That little boundary that passed through seemed to act as one, but the cells still had trouble surviving.

We're so gonna waste solid parameters because of no lifting mechanism. We almost always fail somehow.

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8 minutes ago, Moosey2323 said:

SPC Mesoanalysis shows > 3500 SBCAPE and > 30 kts of bulk shear. Are we just failing to get a reliable lifting mechanism? That little boundary that passed through seemed to act as one, but the cells still had trouble surviving.

We often blame mid-level lapse rates, and today seems to be no exception.

IMG_2705.thumb.jpeg.1f14b8397857795b2da55460d8c4a91f.jpeg

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Some booms to my SSE (Harford county), nice building cumulus, partly sunny. It just rained 3 hours ago. We are drought busting like crazy.  For now on, take months of below average rainfall as instability in the Spring/Summer. Although, if it wasn't El Nino, I don't know that we would be getting this.  

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39 minutes ago, Kmlwx said:

Seems we will continue to wait for our once in a decade (or longer) alignment of EML, shear etc. I'd even settle for a non-EML robust cold pool event. 

When did that happen last, in your opinion? I know it's a totally subjective question. 

Please don't say "never." Offhand, I don't have a clue what the BRN or low-level shear was for the derecho; I know CAPE (j/kg-1) values were something ungodly, like 5500. 

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19 minutes ago, 09-10 analogy said:

When did that happen last, in your opinion? I know it's a totally subjective question. 

Please don't say "never." Offhand, I don't have a clue what the BRN or low-level shear was for the derecho; I know CAPE (j/kg-1) values were something ungodly, like 5500. 

Really June 2012 may have been the last truly area-wide significant severe event. Any one location has had other occurrences since then (would have to look at specific dates) - maybe 2016 had a few good area-wide events? 

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4 minutes ago, Kmlwx said:

Really June 2012 may have been the last truly area-wide significant severe event. Any one location has had other occurrences since then (would have to look at specific dates) - maybe 2016 had a few good area-wide events? 

IMO, June 13, 2013: https://www.spc.noaa.gov/exper/archive/event.php?date=20130613

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2 hours ago, Kmlwx said:

Can't believe I forgot about that one - would tend to agree. 

    I hated that event.      Was likely to be a pretty big day, but a dying derecho rolled through during the early morning.    It still had enough punch for some wind events in northern MD, but its main contribution to the day was to severely reduce the instability.       A small complex with an embedded supercell actually tracked across Montgomery County during the mid and late afternoon with a fairly long-track (but overall weak) tornado, while another derecho tracked through the southern half of VA, far southern MD, and NC.    Without the lead dying derecho, it would have been a pretty massive afternoon in the DC/Baltimore area too.

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I got pounded three times in 2010 with 70+ gusts and have not reached 70 since. Even derecho was 60-65. Lots of tree damage with first one in 2010 .  and Kenny wasn’t that late June ? one where Brookside Gardens had 90moh gusts?  There was a plaque  over there about it at one time 

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We try again today lol... 2/15/15 from SPC with talk of a few supercells possible 

Morning AFD from LWX below:

 

For the rest of today through tonight, an upper-level trough
will slide through the Ohio Valley into New England while high
pressure remains offshore. A south to southwest flow will
continue to usher in very warm and humid conditions to the area.
There should be enough breaks of sunshine this morning, and also
behind the aforementioned MCV this afternoon for the atmosphere
to destabilize. Latest guidance shows around 1.5-3 KJ/KG of
MLCAPE developing ahead of a weak cold front/surface trough that
will most likely move into the area later this afternoon into
this evening from the west (associated with upper-level trough
axis to our north). The moderate CAPE will combine with stronger
shear profiles, increasing the threat for some severe storms
with damaging wind gusts and large hail being the primary
threats. However, the low-level flow may be backed somewhat,
increasing low-level shear, so an isolated tornado cannot be
ruled out. The best chance for severe storms and an isolated
tornado will be around mid afternoon through this evening near
and east of the Blue Ridge/Catoctin Mountains (where instability
will be highest east of the weak cold front/surface trough).

When comparing the atmosphere to yesterday thermodynamically,
it is similar. There was a small stable layer along with mid-
level clouds at times that caused convection to be more
sporadic. There is a similar setup today, but it does appear
that the low-level forcing will be a bit stronger with the weak
boundary moving in. Therefore, we went areal with the pops with
scattered to numerous showers and thunderstorms (highest pops
near/east of Blue Ridge and Catoctins).

Convection should wane later tonight with the loss of daytime
heating. Warm and humid conditions will persist with patchy fog
possible, especially in areas that do receive rainfall
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