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T-Storms Part 2 : "North and West of the city!"


TalcottWx

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Of course you'd say that.Your're jaded after 20 misses Lots of good parameters lining up tomorrow.

You've said this about 15 times this summer.

Looks like your token Berks and NNE deal. Probably a couple of stronger storms near ORH and perhaps you, but overall nothing we haven't seen before.

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You've said this about 15 times this summer.

Looks like your token Berks and NNE deal. Probably a couple of stronger storms near ORH and perhaps you, but overall nothing we haven't seen before.

SPC with slight risk. Hope you get in on the action. if we miss storms tomorrow..all rains next week miss south..Then things really get dangerous

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If you get excited by a squall line with some marginally severe wind gusts, then maybe tomorrow will get your attention. Otherwise it's not a particularly impressive setup. Mid-level lapse rates look meh and the shear pattern is fairly unidirectional.

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Tomorrow will be quite an active day convectively across southern New England with very favorable timing.  The question now is what are we looking at in terms of strong to severe t'storm potential?  First off, we will see a few t'storms become strong to severe which will pose a threat for strong to damaging winds and large hail.  Flash flooding will be an issue as well.  Tomorrow does have the POTENTIAL to be a more active day in terms of severe weather...not saying outbreak but we could see our share of severe weather reports.  

 

The main question is how much does the stronger shear values lag behind the front?  The NAM and GFS do differ with the GFS being more aggressive bringing in 30-40 knots at 500mb between 18z and 21z, which coincides with the timing of the front.  If these values do arrive with the convection or just prior this will increase the threat of damaging winds as well as large hail.  

 

Another big question is what do we see happen with the LLJ?  The NAM has been much more bullish with developing a rather strong LLJ (upwards of 35-40 knots) while the GFS is around 20-25 knots.  The NAM does have a tendency to overplay the LLJ, however, we should see an increase regardless as we move towards the evening hours when typically the LLJ does intensify...this will have to be watched closely b/c if the LLJ does intensify this would increase the severe threat and also introduce the possibility of enhanced rotation.  

 

Instability should not be too much of a concern tomorrow and we should see moderate instability develop.  High surface dewpoints/low level moisture (dews near 70F) and modest mid-level lapse rates (6-6.5 C/KM) under the presence of strong surface heating will yield to SBcapes approaching 1500-2000 J/KG (perhaps upwards of 2500 J/KG if we see really strong heating), MLcape values around 1500 J/KG (perhaps near 2000 J/KG), and LI values near -6C.  Ncape values should be close to 0.25 or so which do indicate we will see a fairly fat cape profile.  Clouds could somewhat hamper instability but not enough to where we should have to worry.  

 

To put all this in a nut shell, tomorrow will be quite active with numerous showers and t'storms with a few becoming strong to severe, however, there is a possibility of a more active severe weather event if a few things can align better but this will have to be assessed in the AM...so perhaps we could see high end slight criteria verify.  

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The analog data does point toward a column of fairly numerous severe wind reports. I think this will be a case where we actually get good destabilization during the day and see little to no marine influence. (Flow is largely W to SW) Any storms that do fire may easily make it to the I-84 corridor and hold their act together with decent speed shear.

High res NAM shows a fairly strong line of storms firing from eastern New York into central New England and dropping southeast.

As Wiz eluded to, if we can get some localized low-level turning, that may possibly enhance the threat. I'd have to say a high end SLGT wind threat is entirely possible, but hail and tornado threats appear marginal at best.

Not a great setup, but a lot of us should see some bangers tomorrow PM.

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The analog data does point toward a column of fairly numerous severe wind reports. I think this will be a case where we actually get good destabilization during the day and see little to no marine influence. (Flow is largely W to SW) Any storms that do fire may easily make it to the I-84 corridor and hold their act together with decent speed shear.

High res NAM shows a fairly strong line of storms firing from eastern New York into central New England and dropping southeast.

As Wiz eluded to, if we can get some localized low-level turning, that may possibly enhance the threat. I'd have to say a high end SLGT wind threat is entirely possible, but hail and tornado threats appear marginal at best.

Not a great setup, but a lot of us should see some bangers tomorrow PM.

 

I never really looked much at vertical velocities but really want to start paying attention to that parameter more with severe but 500mb vertical velocities looked pretty decent...even 700mb.  So if we can get updrafts to penetrate these levels could act to enhance updraft momentum and increase wind/hail potential.  

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Meh - 20 knots of 0-6km bulk and effective shear. Meh, meh meh.

 

Nice EML over DTX this morning... maybe a late night banger? 

 

The shear starts off pretty meh but it does increase later on in the afternoon...it's just a question of how much does it lag behind the front...the GFS increases 0-6 shear upwards of 30 knots between 21z-0z.  

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