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Week of June 10th Heavy Rain and Thunderstorms Discussion


IsentropicLift

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Why would anyone want a cold rain storm in June? Take this as far north as possible. 

 

No one does, but there's nothing better to track unfortunately.

 

Low passes right over LI. Sub 990, amazing for June especially since it's of non-tropical origins. It's not too common to see sub 990 pressures in the winter either, maybe 5/6 times a year.

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There is still essentially 0 surface-based CAPE for our region on the NAM. There is a bit of elevated instability, so perhaps thundery rain or a weak line with high synoptic scale winds is in the cards. 

 That's strange too see. I think even the EURO had some CAPE for us

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The elevated instability might help with some sort of moderate squall either embedded in the rain, or by itself. However, the elevated instability is co-located with only speed shear, not directional shear, since the stronger directional shear is closer to the surface, whereas once you go above 800mb, the shear is really only speed shear and not directional shear. Thus, the severe threat is still pretty low for us. The warm front does not get far enough north during peak heating, and by the time it would even theoretically get close to us in the northward solutions, the cold front would rapidly approach, as would darkness, so you get a linear mode and only elevated convection. 

 

Without the surface based CAPE, it will be hard to really rotate any prominent updrafts. 

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The elevated instability might help with some sort of moderate squall either embedded in the rain, or by itself. However, the elevated instability is co-located with only speed shear, not directional shear, since the stronger directional shear is closer to the surface, whereas once you go above 800mb, the shear is really only speed shear and not directional shear. Thus, the severe threat is still pretty low for us. The warm front does not get far enough north during peak heating, and by the time it would even theoretically get close to us in the northward solutions, the cold front would rapidly approach, as would darkness, so you get a linear mode and only elevated convection. 

 

Without the surface based CAPE, it will be hard to really rotate any prominent updrafts. 

Great points,  thanks

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Euro trended slower and a little more north. It now gets us to about 1000 CAPE (a nice improvement over previous runs)

 

 

Where do you find instability on the Euro? 

 

Anyway, John and I wrote another technical discussion regarding the severe potential. Central NJ might now be in the game for a tornado threat, though they are still borderline. NYC could perhaps get hit by the northern end of a weakening, but still pretty potent squall line if things go right, IMO. I'm not as bullish as SPC is for our area specifically. Our thoughts are elaborated on in here: 

http://www.nymetroweather.com/2013/06/12/myriad-of-threats-expected-from-midweek-storm/

 

I need sleep. 

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Where do you find instability on the Euro? 

 

Anyway, John and I wrote another technical discussion regarding the severe potential. Central NJ might now be in the game for a tornado threat, though they are still borderline. NYC could perhaps get hit by the northern end of a weakening, but still pretty potent squall line if things go right, IMO. I'm not as bullish as SPC is for our area specifically. Our thoughts are elaborated on here: 

http://www.nymetroweather.com/2013/06/12/myriad-of-threats-expected-from-midweek-storm/

 

I need sleep. 

 

Excellent write-up guys.

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