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2021 Mid-Atlantic Severe Weather - General Discussion


Kmlwx
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5 hours ago, A777 said:

20120601 2000 UTC Day 1 Tornado Probabilities Graphic

OTD 9 years ago...

120601_rpts Reports Graphic

       Definitely a good SVR day for this area, but none of the tornadoes was particularly strong.  I remember leaving work early to get home before things got bad, and the cells had some nice signatures but nothing with major impacts.

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     Nothing I've seen this evening has tempered my cautious optimism for Thursday.    Good convective signal across the CAMs with modest instability and either respectable or even good low-level shear (depending on your model of choice).     Not sure there is enough for a day 2 ENH, but I expect the overnight update to at the least maintain the SLGT with a 5 TOR probability for our area.

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LWX morning AFD sounds good for severe tomorrow afternoon... would be cool to see a supercell structure again

.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...
We`ll start out the day on Thursday with low clouds in place, but
most of the overnight showers and storms should have progressed off
to our north and east along with the leading edge of the low-level
moisture advection. Low clouds should gradually rise into a mid-
level deck over the course of the morning. As daytime heating
ensues, temperatures will reach into the upper 70s to lower 80s,
which when combined with dewpoints in the mid-upper 60s will result
in around 1000 J/kg of MLCAPE across the area by early afternoon. As
the trough slowly moves off to the east, flow aloft will be on the
increase, resulting in around 30-40 knots of 0-6 km shear over the
area. HREF members are in fairly good agreement about developing
storms near or just west of the Blue Ridge during the early
afternoon hours, and then progressing those storms off to the east
during the afternoon and evening hours. Given the parameter space in
place, well organized multicell clusters or some marginal supercell
structures may be possible as storms move through the area. Damaging
winds look to be the main hazard associated with these storms,
prompting a day 2 slight risk from SPC to the east of the Blue
Ridge. A marginal risk is in place further to the west, where
instability looks to be lesser and areal coverage of storms is
expected to be lower. Locations to the east of the Blue Ridge are
also under a marginal risk for excessive rainfall from WPC. While
storm motions should be relatively fast, precipitable water values
are anomalously high (around 1.5-1.8 inches) and unidirectional flow
through much of the column with a decent low-level jet could lead to
efficient heavy rainfall production and localized training elements.

Storms may linger in some spots into Thursday night, and a few
additional storms may be possible on Friday as the upper level
trough axis swings through. However, the threat for both severe
thunderstorms and flash flooding look much lower on Friday.

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Mount Holly seems more concerned about hydro issues than severe, given the impressive moisture plume and 2 rounds of convection possibly occurring over the same area. They mention the possibility of a few damaging wind gusts via wet microburst.

WPC has the area in a marginal risk for excessive rain Thursday.

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2 hours ago, CAPE said:

Mount Holly seems more concerned about hydro issues than severe, given the impressive moisture plume and 2 rounds of convection possibly occurring over the same area. They mention the possibility of a few damaging wind gusts via wet microburst.

WPC has the area in a marginal risk for excessive rain Thursday.

The breakdowm in the Mount holly AFD was epic ! 

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5 minutes ago, Eskimo Joe said:

06z NAM is disappointing unless you're in Carroll and Baltimore counties.

There seems to be a lot of junk around to muddy things up earlier in the day. My guess is somewhere gets a severe report or two - but we'll keep waiting for our uber-outbreak. 

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2 minutes ago, Kmlwx said:

There seems to be a lot of junk around to muddy things up earlier in the day. My guess is somewhere gets a severe report or two - but we'll keep waiting for our uber-outbreak. 

We're past the spring climo for good severe weather in these parts. Unless something happens quick, we're probably waiting for tropical season. Last week was probably the event of the spring.

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7 minutes ago, Eskimo Joe said:

We're past the spring climo for good severe weather in these parts. Unless something happens quick, we're probably waiting for tropical season. Last week was probably the event of the spring.

Agreed for the most part. I think there's a few ways we can score still - 

1) Super high heat, ring of fire ridge type derecho event (June 2012 esque)

2) A high instability day where a lone cell or two can really blow up and cause a stripe of hail/very damaging wind (but large enough to not be considered super isolated)

I'm holding out hope that we can get a strong front still at some point with some sort of EML type airmass and having the warm front nearby but north of us. That's very wishful thinking though. We are probably into summer pulse season for the most part. 

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5 minutes ago, Eskimo Joe said:

NAMNEST really likes the upper level energy swinging through on Friday, and focuses a couple of UHI tracks over the heart of the metro area. That is not an impossible scenario.

Let it be known - EJ is predicting wedges over the metro area. 

SPC just has us in general thunder - so we have that going for us for Friday as well...

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