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Spring/ Summer 2014 Convection Discussion


weatherwiz

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The NAM has an impressive sultan signal.

 

Probably will be a case of the haves and the have nots... someone will get drenched and many will probably see only a little.

The NAM stalls the front over southern NY while a wave of low pressure develops over PA and tracks eastward. The 4k version is showing SBCAPE in the 2000-4000J/KG range from eastern PA into NYC with a bit less towards southern New England as the front never makes it quite that far north. Looks to be a case where New England receives some heavy stratiform rain while NYC and points southwest have a crack at severe. Timing looks good for once down this way.

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The NAM stalls the front over southern NY while a wave of low pressure develops over PA and tracks eastward. The 4k version is showing SBCAPE in the 2000-4000J/KG range from eastern PA into NYC with a bit less towards southern New England as the front never makes it quite that far north. Looks to be a case where New England receives some heavy stratiform rain while NYC and points southwest have a crack at severe. Timing looks good for once down this way.

 

SPC has the "see text" out. CAPE is skinny, but inverted V and increasing PWATs support a wet microburst or two.

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SPC has the "see text" out. CAPE is skinny, but inverted V and increasing PWATs support a wet microburst or two.

Skinny perhaps, but this was quite an increase from previous runs. Too bad it's the NAM.

 

post-2786-0-62439500-1403536681_thumb.pn

 

And resulting squall line

 

post-2786-0-22553900-1403536790_thumb.pn

 

The models have been awful with convective precip this year so confidence is low.

 

 

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There is a nice signal there, I'm leaning more towards the localized side of things though. I guess it's possible the GFS is right and our northern half of the area gets 3-5". At least that might mean a few FFWs. Two short-fused warnings (SVR, FFW, TOR, SMW) all year so far.

Yeah I don't know about the widespread look either. Just that it had a look if dumping on some NNE peeps

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SPC has the "see text" out. CAPE is skinny, but inverted V and increasing PWATs support a wet microburst or two.

...NRN PA/SRN NY INTO SRN NEW ENGLAND...

SRN INFLUENCE OF WEAK SHORT-WAVE TROUGH WILL EJECT ACROSS THE LOWER

GREAT LAKES INTO THE NERN U.S. WEDNESDAY. THIS FEATURE SHOULD ALLOW

SFC FRONT TO SAG TO A POSITION FROM NRN NEW ENGLAND...SWWD ALONG THE

NY/PA BORDER BY 18Z...JUST PRIOR TO CONVECTIVE INITIATION. WLY FLOW

SHOULD ALLOW STRONGEST HEATING ALONG A CORRIDOR FROM CNTRL PA INTO

SRN NEW ENGLAND WERE TEMPERATURES SHOULD RISE INTO THE MID

70S...SUFFICIENT FOR CONVECTIVE DEVELOPMENT. ALTHOUGH AIRMASS IS

NOT EXPECTED TO BE PARTICULARLY UNSTABLE...MODEST SHEAR IS EXPECTED

TO SUPPORT MULTICELL UPDRAFTS CAPABLE OF PRODUCING GUSTY WINDS.

..DARROW.. 06/23/2014

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Cape profiles will be quite skinny given poor lapse rates. Shear aloft may be just adequate for an organized squall line...especially if capes verify but we would be looking at strong storms and maybe a few briefly reaching severe limits...will be a classic milti-cell example of one downdraft dominates, fizzles than another takes over

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Next week could be an active severe week. 

 

Agreed with this. The 00z Euro would have some real potential on July 1st, but that is still quite far out. Still, with quite a strong jet projected across the northern portions of the country late this week into next, I'd tend to think that eventually something will make its way towards this region. Seems EML advection could be a possibility too.

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could see threat Thursday across eastern SNE

CAPE looks significantly better (as per NAM)

 

Wednesday:

namNE_con_sbcape_027.gif

 

Thursday:  

namNE_con_sbcape_054.gif

 

Thursday sounding around BOS

18_NAM_054_42.16,-71.71_skewt_ML.gif

 

Helicity and shear are kind of pitiful, though.  Feel like that's been the theme with this one.  I worry about quick firing on Thursday though, there really is no capping of any sort going on.  Garden variety with sctd wind/hail reports seems like a logical forecast.

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Instability dependent, tomorrow could feature a pretty decent line of storms across RI into eastern MA.  Actually looks like there could be an area of some decent (at least if enough cape develops) 0-6km shear with values right around 30 knots.  Could have some enhanced convergence too with leftover boundaries and such.  PWATS are quite high so torrential downpours/flash flooding is biggest threat but strong winds possible too as could see a wet microburst or two.  

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Instability dependent, tomorrow could feature a pretty decent line of storms across RI into eastern MA.  Actually looks like there could be an area of some decent (at least if enough cape develops) 0-6km shear with values right around 30 knots.  Could have some enhanced convergence too with leftover boundaries and such.  PWATS are quite high so torrential downpours/flash flooding is biggest threat but strong winds possible too as could see a wet microburst or two.

From your lips to God's ears, Wiz

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Models did great pegging the Sultan Signal.

Yeah, however the heavy rain seems to have gone further south than the models had the past few days (HRRR and today's model runs aside). Even yesterday the GFS/NAM/GGEM had a pretty sharp cut off from GFL-RUT over to the Lakes Region in NH. Some of the heaviest totals from this event should be well south of that modeled cut-off....like ALB-Berks-Monadnocks.

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