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May observations and discussions...


ag3

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I'm surprised SPC is hitting this as hard as they are -- I was not that impressed with the data...but I always say they are the best at what they do. To me, it looks like a good setup to keep the best stuff west of here. That being said, there is an elevated instability axis through tonight that could keep the storms going. But the effective/0-6km shear didn't impress me at all either...and seemed to be lagging behind the pre frontal trough that's triggering the storms.

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I agree theres not much difference in the way 89 or 90 feels anyway, its more the perception of 90 is heat.

Speaking of NYC its caught up to the surrounding sites and is at 84 now (its forecasted high)

Yeah, the bigger story may be that even for Central Park the last 5 out of 7 summers have averaged above normal.

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Euro keeps hinting at a trough over or nearby the NE coast, GFS a bit more bullish on ridging coming east between the 5th and 7th and thereafter. Perhaps a more zonal compromise is the way to go. Both show a deep trough digging into the west in about a week and beyond.

This coming weekend may not be as friendly as the last few - looking a bit unsetteled

I would think a ridge in the east is the way to go if a deep trough digs into the west....

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Moderate risk on the way north of us

mcd0954.gif

MESOSCALE DISCUSSION 0954

NWS STORM PREDICTION CENTER NORMAN OK

1043 AM CDT TUE MAY 29 2012

AREAS AFFECTED...CNTRL/ERN NY...NERN PA...FAR W CNTRL VT

CONCERNING...OUTLOOK UPGRADE

VALID 291543Z - 291645Z

SUMMARY...AN UPGRADE TO MDT RISK APPEARS TO BE WARRANTED ACROSS

PORTIONS OF THE NORTHEAST WITH THE 1630Z OUTLOOK. A PRIMARY THREAT

OF DMGG WIND IS EXPECTED...THOUGH LARGE HAIL IS ALSO POSSIBLE. AN

ENHANCED TORNADO THREAT MAY EXIST ALONG THE HUDSON VALLEY AND

PORTIONS OF WRN NEW ENGLAND LATER TODAY.

DISCUSSION...NUMEROUS THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS

AFTERNOON WITH THE APPROACH OF A STRONG UPPER TROUGH. WITH VARIOUS

AREAS OF INITIATION POSSIBLE AND STORMS APPROACHING FROM THE

W...SEVERAL ROUNDS OF THUNDERSTORMS MAY BE POSSIBLE ACROSS THE

REGION. GIVEN STRONGER LOW LEVEL WINDS ACROSS CNTRL NY INTO WRN NEW

ENGLAND AND THE SEASONABLY MOIST/UNSTABLE AIR MASS...AN UPGRADE TO

MDT FOR DMGG WINDS APPEARS WARRANTED. PLEASE SEE THE UPCOMING 1630Z

OUTLOOK FOR ADDITIONAL INFORMATION.

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Another MCD for potential severe t-storm /tornado watch soon, up north.

307xbu8.jpg

MESOSCALE DISCUSSION 0956

NWS STORM PREDICTION CENTER NORMAN OK

1056 AM CDT TUE MAY 29 2012

AREAS AFFECTED...ERN NY INTO WRN NEW ENGLAND

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 291556Z - 291700Z

PROBABILITY OF WATCH ISSUANCE...95 PERCENT

SUMMARY...GIVEN THE HIGHER THAN AVERAGE CONFIDENCE OF SEVERE

THUNDERSTORM DEVELOPMENT...A WW IS BEING COORDINATED SHORTLY FOR ERN

NY AND WRN NEW ENGLAND. ALTHOUGH A SEVERE THUNDERSTORM WW IS LIKELY

FOR WRN PORTIONS OF THE AREA...A TORNADO WW IS BEING CONSIDERED FOR

THE HUDSON VALLEY EWD.

DISCUSSION...WITH STORMS APPROACHING FROM THE WEST AND ADDITIONAL

DEVELOPMENT LIKELY LATER TODAY...A WW MAY BE NEEDED SHORTLY. SEVERAL

AREAS OF NEW INITIATION REMAIN POSSIBLE...INCLUDING ALONG THE

PREFRONTAL TROUGH OVER ERN NY...AND ALONG A REMNANT OUTFLOW BOUNDARY

ACROSS THE MOHAWK VALLEY. ALTHOUGH THE AIR MASS IS MODERATELY

UNSTABLE AND NO LONGER CAPPED...NEW INITIATION WILL LIKELY BE

DELAYED BY THE PRESENCE OF THE UPPER RIDGE. AS HEIGHTS BEGIN TO FALL

AND FORCING FOR ASCENT APPROACHES THE AREA...THUNDERSTORMS WILL

BEGIN TO INCREASE IN COVERAGE. A PREDOMINANT THREAT OF DMGG WINDS IS

EXPECTED...GIVEN THE STRENGTHENING LOW LEVEL JET /25-30 KT 850 MB

JET BY THIS AFTERNOON/ AND STEEPENING LOW LEVEL LAPSE RATES. WITH

BACKED SLY SURFACE WINDS IN THE HUDSON VALLEY AND 70S DEW

POINTS...ENHANCED TORNADO POTENTIAL MAY EXIST...ESPECIALLY WITH ANY

DISCRETE SUPERCELLS THAT CAN DEVELOP AHEAD OF THE MAIN LINE OF

CONVECTION.

..HURLBUT/WEISS.. 05/29/2012

ATTN...WFO...BOX...BTV...OKX...ALY...BGM...

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agreed and I think it may happen

The effective shear is farther east than it was forecast so far .. but it looks like it will lag behind the storms triggered by the pre frontal trough today..and then the best 0-6km shear will shift northeast into New England. That is my main concern as far as not getting organized severe storms here.

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The sfc-3km lapse rate and sfc-3km mlcape maps look pretty supportive at this hour. But notice how the effective shear is arced to the north from Western PA/NY State and then over New England. This can be a big factor in mitigating severe storm potential. We need to see this shift east towards our area tonight.

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Said it earlier, but not enthused about the set up with the poor shear ahead of the pre frontal trough especially in our area. It's going to be hard to get organized storms into this environment if they can't develop an organized cold pool and then drop east/southeast into the best instability.

eshr.gif?1338312614111

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I think John is right, we have a very destablilized atmosphere but no real shear to spark storms. Height falls associated with the upper level low are well to our west and north with the best shear also. I do also agree our best shot will be from the leading edge of the cold pool associated with the storms, which might be the reason for the development to our west right now. Nothing really moving this way though.

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