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Potential major phasing event this weekend


forkyfork

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Bluewave if the storm did happen as the euro portrays it albeit still in fantasy land, this would really disasterous impacts to coastal areas and places along the coast correct?

The sections of coastline that were exposed to onshore winds while the storm is getting pulled in would really take

a beating if the Euro idea actually verified. The exact location and timing of this would be crucial especially if

it coincided with high tide during the full moon.

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I think the key to getting Sandy to phase with the incoming trough will be her position while crossing the Bahamas.

The Euro is going with a further to the west Bahamas track while the GFS is more east. Any westward trending

to GFS runs in the next few days would allow a possible phasing solution to occur on the GFS. The difference between

a capture or an escape will be really small.

Euro

GFS

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EPS Control run of the ECMWF looks pretty much the same as the operational.

Food for thought. NAO is already pretty decently negative.

the AO was at its lowest point since before June...Look for some kind of wintry event soon whether it is some snow mixed in or near record low temperatures coming soon to a backyard near you...October's AO index will end up quite negative...A good sign for the upcoming winter...

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Got this from the Mid Atlantic thread.

Wes

The european ens has come quite a bit west and now gives much more support to the ecmwf making this a really interesting forecast. The blocking the ens mean shows and the negative tilt trough increase the odds of the storm getting captured by the upper trough so I think Jason's (CWG) odds of over a 50% chance of someone along the east coast being impacted by the storm is now a pretty good call. We're still so far from the event lots can change but the strong blocking makes amplification of the approaching trough more likely than not which may make the overall pattern a little more predictable than normal. Still, the timing of the amplification and the how fast and where the storm initially tracks will help decide where the system actually goes

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Still several days until the exact track of the system gets resolved, but i think we're two or so days away from knowing if this is legitimate or not.

Two important features that have been fluctuating dramatically on guidance are the ridge in the E PAC and associated PAC energy (which will remain a huge uncertainty until correctly sampled) and the NW Atlantic ridge interaction with the early-period Newfoundland ULL -- which eventually slides southeast and helps develop a huge block over NF.

That tremendous block which is now appearing on globals and ensembles is a huge feature, as it essentially both forces the Central US energy under the TC ULL, but also stops it from moving anywhere but northwest at that point. Just glancing at last nights Euro, you can see Sandy literally running into a brick wall. As the energy from the Central US slides underneath her she is tugged north and west and subject to rapid strengthening.

Paying attention to global ensembles will be key -- as well as carefully watching the TC over the next 48+ hours.

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HPC

...POTENTIAL FOR MAJOR STORM OVER THE MID ATLANTIC & NORTHEAST

EARLY NEXT WEEK...

UPDATED THE PRELIMINARY FRONTS AND PRESSURES FOR DAYS 3 THROUGH 7

USING THE 00Z/23 EUROPEAN CENTRE ENSEMBLE MEAN, WITH A SMALL

INCORPORATION OF THE 00Z/23 EUROPEAN CENTRE DETERMINISTIC MODEL TO

LEND MORE DEFINITION TO THE SYNOPTIC GRADIENTS ACROSS THE NATION.

USED THE MOST RECENT FORECAST FROM THE NATIONAL HURRICANE CENTER

FOR THE TRACK OF TROPICAL STORM SANDY THROUGH DAY 5, WITH A CURVE

TO THE NORTHWEST DAYS 6 AND 7 BASED ON THE ECENS MEAN. THE 00Z/23

GEM GLOBAL CONTINUES TO CLUSTER WITH THE ECMWF FOR THE BEHAVIOR OF

SANDY ONCE IT TRANSITIONS TO A SUBTROPICAL SYSTEM, INDICATING THAT

THE CYCLONE GETS PULLED BACK TOWARD THE SHARP UPPER TROUGH CLOSING

OVER THE OHIO VALLEY. THE ECMWF AND GEM GLOBAL HAVE SEVERAL RUNS

OF CONTINUITY NOW WITH THE EVOLUTION OF THIS EVENT, WITH THE

DETERMINISTIC GFS LESS STABLE. THERE HAVE BEEN GFS ENSEMBLE

MEMBERS QUITE SIMILAR TO THE ECMWF/GEM CAMP FOR THE LAST FEW DAYS

OF MODEL CYCLES, PUTTING THE DETERMINISTIC GFS SOLUTIONS IN A

BROADER FRAMEWORK WITH THEIR TRACK OF SANDY WELL OVER THE OPEN

ATLANTIC. WILL BE UPDATING THE TRACK OF SANDY THROUGH DAY 5 FOR

THE FINAL PACKAGE WITH THE ADVENT OF THE NEW NATIONAL HURRICANE

CENTER FORECAST, AND ITS BEHAVIOR AS A SUBTROPICAL LOW THEREAFTER

AS PER OUR HOTLINE COORDINATION.

CISCO

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If we saw the Euro solution verify, then I think that it would be the first time a TC phased

with a trough while under the exit region of the STJ. The Euro jet forecast more resembles

the jet signature with our strongest cold season lows. Adding a TC to this mix would take

things to a level of rarity that would be remarkable.

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