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June 21 and 23 severe weather risks


Ian

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which was a little slow -- survey had time from 1:29 to 1:48

but is preliminary and could change.

Think they warned after TDS which showed around 130. Then they called it a possible tornado. Because lwx is terrible.
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I was talking more about the soundings at 18z... DCA has >3000 SBCAPE

Setup kinda reminds me of the June 2013 debacle where we had a solid supercell go through Frederick / Carroll counties.  It then died and laid a boundary right across Loudoun/Montgomery/northern PG/Anne Arundel counties that let a lone storm spin up and #wedge across the northern DC suburbs.Maybe we'll get lucky again...

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So is the day 1 slight just because of how early the mcs would get here?

 

Yes - and since the SPC outlooks go until 12z the following day it seems mostly like SPC CYAing in case a few isolated reports make it this far. I mostly think the complex will be very heavy rain and slightly gusty winds by the time it gets here. 

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So is the day 1 slight just because of how early the mcs would get here?

 

yes. SPC outlooks go until 12z the following day. So because it would come tonight, early tomorrow, it is technically included in the outlook. 

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To be fair...our last few "warm sector advancement dependent" events have had pretty good luck with pushing the warm sector north. Tho none were like this setup. 

I'd still lean heavily on the south and west idea...But I'm also a big fan of Ian's method of persistence - ex: we got lots of storms yesterday so we shall get lucky again. 

We just can't know 

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12z GFS sounding at DCA at 18z THUR has 5000 SBCAPE with temps approaching 90 and DP's in the mid 70s

I have a hard time believing that dewpoint. Shave a couple or a bunch of degrees off that and you'll probably lose a lot of instability. Add in the fact that the warmth may not even be that extensive and we're right back at the meh solutions. 

IAN - CONVINCE ME OTHERWISE. 

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If you look closely at the NAM nest, it looks like a monster MCS is about to swallow the entire area at 12z.   But most of it actually goes north of DC during the morning.  So it heats areas along and south of an axis from roughly Leesburg to Annapolis and generates decent storms on the south side of the MCS/outflow boundary which then move south into the better instability.

 

I'm inclined to think that the outflow will set up further south, but who knows?

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Thanks a bunch. Yeah. That's pretty scary. I have two trees adjacent to my house and always worry that one will decide to come through the house. I'm glad those folks are okay.

 

the tree was fairly close to the house -- pic of the backside of it. 

post-115-0-60638400-1466613668_thumb.jpg

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