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Summer 2015 General Thunderstorm Thread


powderfreak

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We root for it to speed up even more? GFS clears the coast basically by Monday morning.

Sunday starting to look a little nasty across NY.

Id be down with that. The dprog/dt on the drops has been pretty crazy. May have to come back from Vermont a bit early.

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So you're saying instead of a Monday outbreak.. We should be hoping/ thinking it's more Sunday?

 

Sunday isn't ideal timing either. We're in between, as usual.

But I wouldn't rule out sustaining convection through the overnight given the lapse rates aloft.

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How about the NYC metro? Just wanna keep a heads up

 

It's pretty damn unstable down that way as well.  I don't think though we're looking at much in the way of convection on Sunday...although with this type of instability it doesn't take much of a ripple moving through the atmosphere to spark something off.  

 

The majority of the convective potential will be ahead of the pre-frontal trough associated with a cold front which will be moving through.  The million dollar question right now is timing...is it early Monday?  later on Monday?  

 

However, I really wouldn't rule out the possibility of overnight severe potential Sunday into Monday...especially if it remains quite unstable through the night which is a very distinct possibility.  

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Just did a point and click on the 18z NAM for Sunday across central NY and the instability is insane...over 5000 MLcape and over 6000 SBcape with TT's in the lower 60's.  Crazy to see those numbers across these parts.  

 

And all we'll get is one black bottomed TCU with a couple nickle to quarter sized windshield blats.  ... do to the impenetrable shield of metaphysical convective death that's clearly cursed upon this region...

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There are issues with today, tomorrow, and Monday. Not expecting much in the way of widespread severe activity but isolated threats perhaps. Today we are dealing with a ton of cloud debris which will effect instability. Tomorrow we will be under more riding aloft with plenty of heat and humidity but perhaps somewhat capped into the evening outside of perhaps the Berkshires,NW CT. Monday the timing of the PFT and FROPA may prohibit much widespread with perhaps eastern areas having the best chance.

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There are issues with today, tomorrow, and Monday. Not expecting much in the way of widespread severe activity but isolated threats perhaps. Today we are dealing with a ton of cloud debris which will effect instability. Tomorrow we will be under more riding aloft with plenty of heat and humidity but perhaps somewhat capped into the evening outside of perhaps the Berkshires,NW CT. Monday the timing of the PFT and FROPA may prohibit much widespread with perhaps eastern areas having the best chance.

Euro is perfect timing wise Monday. GFS is tossed

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Even with perfect timing Monday I don't think we are looking at widespread severe weather potential.  While the potential is there for >3000 SBcape and 2500 MLcape the winds aloft are kind of lacking.  If these instability values materialized, they would certainly compensate for lack of stronger shear.  

 

What the lack of stronger shear will do is prevent great storm organization and probably make for more pulse-like storms which will have the potential to produce damaging winds in the form of microbursts.  Can't rule out hail either but with lack of shear it may be hard to get much in the way of severe hail, although 1'' couldn't be ruled out..maybe slightly larger.

 

FWIW, the 6z GFS does seem a tad slower with timing

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