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12/19-12/20 threat


CoastalWx

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haha...haven't been able to log on all morning....driving me nuts. On my phone now.

Im not sold at all yet. Hvy hvy caution. I still think scraper...but that's one awesome storm on the ec.

Yeah I'm pretty cautious as well. Want to see what 12z does, but this would also be fitting for the gfs to lose the storm, and then the euro sweeps in and steals the show.

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They were very wrong yesterday. They're right today. No way should any met take the Euro with more than a grain of salt YET. Very little support from any other model runs, including its own. It would be careless of them not to throw out the 00z Euro, for now.

+1 TOTALLY agree. I think the Euro blipped and will be back to its old story at 12z.

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Barry Burbank's weatherblog on wbz4.com

"Dumbfounded

Yes, that’s what I am this morning- dumbfounded. Why? Well, all week the most reliable forecast model had consistently projected the upcoming storm only sideswiping some light snow over Cape Cod with some ocean-effect snow showers over the rest of the coastal plain. Now, its latest output is a 180. Yes, it is advertising a significant nor’easter for Sunday night and Monday. Despite my faith in its superior physics and mathematics, this latest Euro model run could be an aberration so I am not pulling out the stops just yet. If the Euro releases similar solutions in the next 2-3 forecast cycles, my confidence would be restored. It may have already latched onto a plausible scenario based upon higher latitude blocking, a reconfiguration of the jet stream amidst phasing of imbedded parcels of energy. Undoubtedly, this pattern is favorable for bombogenesis. The trick is determining the location of the initial and mature stages. Earlier Euro runs depicted a monstrous storm offshore but it now has the beast tucked much closer to Cape Cod. This path would produce rain there and maybe a mix on the South Shore with more than a foot of snow and some sleet most other places! Simultaneously, the other mathematical models which were zigging and zagging all week are all sending the storm far out to sea. The reality is that there remains a high degree of uncertainty which, hopefully, will all be resolved in the next 36-48 hours. It will be mighty interesting to see how this is all going to shake out."

He even gave a shout out to Tolland CT, which is out of his viewing range

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What would explain the Euro moving/nudging/racing west? I understand the PV shifted west, but is it ingesting new/better data as this starts to come in off the Pac?

I believe the s/w is stronger than it had currently thought, and maybe it won't get shredded so much allowing for more amplification?

or it could have been a burp run and the only people seeing snow are fishermen. rolleyes.gif

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This is a pretty interesting diagnostic discussion. Basically they are okay with the NAMs strong southern shortwave but they think the EC is pushing the retrograding too far west allowing for more nw ATL ridging and a closer to the coast solution. So the real issue to resolve might not be the sw shortwave, but instead the amount of retrogression in Ontario.

SHORTWAVE TROUGH TRACKING FROM S. CALIFORNIA TO THE SOUTHEAST

THROUGH THE PERIOD...

PREFERENCE: BEFORE 00Z SAT...3/4 GFS TO 1/4 NAM

AFTER 00Z SAT...MOVE TOWARD THE GEFS MEAN

THE NAM SHOWS GREATER TROUGH AMPLIFICATION CROSSING S. CALIFORNIA

COMPARED TO ALL OTHER GUIDANCE...AND WHILE THE GFS/ECMWF HAVE

TRENDED STRONGER...THEY REMAIN NOTICEABLY WEAKER CROSSING THE

SOUTHWEST. GIVEN THAT ALL MODELS APPEAR TO INITIALIZE REASONABLY

WELL...AND THE TIME FRAME IN QUESTION WHICH IS WITHIN THE NEXT 36

TO 48 HRS...IT IS DIFFICULT TO RULE OUT THE STRONGER NAM WHICH

COULD BE ATTRIBUTED TO ITS HIGHER SPATIAL RESOLUTION. LATER IN THE

FORECAST PERIOD AS THE TROUGH REACHES THE SOUTHEAST...THE NAM IS

STRONGEST WITH A SECONDARY SURFACE LOW FORMING IN THE NORTHEAST

GULF WHICH THEN HELPS TO PIVOT THE PRIMARY LOW OFF THE SOUTH

CAROLINA COAST TOWARD THE NORTHERN EDGE OF THE GUIDANCE BY 84 HRS.

THE NEW ECMWF...WHILE ONLY SLIGHTLY LESS AMPLIFIED ALOFT CROSSING

THE SOUTHEAST ALSO FORMS A SECONDARY LOW IN THE NORTHEAST

GULF...BUT IT IS A LITTLE WEAKER AND PROGRESSIVE...BUT STILL

RESULTS IN A NEARLY IDENTICAL SURFACE LOW DEPICTION AT 84 HRS.

HOWEVER...ITS SOLUTION APPEARS MORE ATTRIBUTED TO THE RETROGRADING

CYCLONE CROSSING ONTARIO WHICH AIDS IN BUILDING A SHORTWAVE RIDGE

OVER THE NORTHWEST ATLANTIC. GIVEN THAT THE ECMWF'S CYCLONE'S

POSITION CROSSING ONTARIO LIES NEAR THE FAST AND NORTHWEST EDGES

OF AN INCREASINGLY LARGE GUIDANCE ENVELOPE...ITS SURFACE LOW

POSITION NEAR THE NC/SC COAST AT 84 HRS IS ALSO IN QUESTION.

THUS...RECOMMEND DISCOUNTING THE NAM/ECMWF SURFACE LOW EVOLUTION

OFF THE SC/NC COAST AT 84 HRS AND USING AN INTERMEDIATE/CONSENSUS

APPROACH UNTIL THE EVENT NEARS AND THE ACCOMPANYING SOLUTION

SPREAD DIMINISHES.

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I believe the s/w is stronger than it had currently thought, and maybe it won't get shredded so much allowing for more amplification?

or it could have been a burp run and the only people seeing snow are fishermen. rolleyes.gif

This next run has the fate of our Universe hanging in the balance. Noose in one hand, weenie in the other... not sure what to do

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