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Potential for a rather potent severe weather event


weatherwiz

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It's interesting that the models have a bit of a warm bubble near and just above 500mb that messes up the integrated 700-500mb lapse rates, but also have a decent cool pocket at 600mb that creates a local steep environment from 700-600. This is especially noticeable on the NAM in ern areas. While you want to see an overall steep look from 700-500...that pocket of steeper rates looks pretty good. That may help with updraft acceleration. The GFS had this too, but not as noticeable and overall some steeper lapse rates.

Also, the models had pretty good helicity between the srfc and 700mb. Some very good turning and increase in speed. That did sort of weaken and change a bit above 700mb as winds got a little weaker and sometimes even backed near 500mb I saw. Now whether that is right or not is one thing, but part of me wonders what that does when winds weaken a bit or back with height. It might only cause more line segments and maybe fewer discrete stuff? I don't know..just something I did notice. I do like the 30+kts at 925. That's usually good if we can get some lower LCLs...which appear to be a bit high..but that won't be evaluated until tomorrow. I think iirc they were modeled too high in 6/1/11. Not that I am going there...just using that as an example.

Overall a decent look tomorrow even if putrid lapse rates. Vectors somewhat orthogonal to the front, cells sort of sliding down from the NW...may take advantage of boundary layer 210 degree flow? Basically seems like at the least, some line segments with maybe a discrete cell or two with some wind damage and hail. If we can get near 7C/KM..could be a lot more fun and perhaps the increases chance of a tornado or two. As usual, we won't know much until we look around and analyze 12z RAOBs. My concern for a more higher end outbreak is the mid level lapse rates. Just don't know how much will squeak in here yet.

SPC did note the NAM has a tendency to create spurious MAULs, probably due to latent heat processes in the model. This adds a bit to total CAPE.

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GFS has really backed off on the instability tomorrow. 

 

12z/18z GFS were laughable for this evening in the Great Lakes FWIW. Combination of CAPE and shear was well underforecast in many areas.

 

Loop of dprog/dt 0-3 km EHI forecast for the 12z GFS, 18z GFS and 00z GFS all valid 00z Tuesday is below.

 

FNKF91p.gif

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D1 has 5% tor for most of New England and 30% wind.
 

Noteworthy that the surface pressures across all guidance are progged to actually be lower tomorrow over SNE than they were on 6/1/11, which should promote a fairly pronounced wind response in the low levels. This is mostly due to the fact that while the surface low isn't quite as strong as it was with the mentioned event, it is closer to the area this time around. Ultimately though, the lapse rates will decide if this is an episode worthy of remembrance in the region, but on paper this is certainly the most volatile setup the region has seen since that aforementioned event.

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