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Jonesing for a Chase


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It was Euro vs. the rest of the guidance, and the Euro has been crap this year. Not surprising to see the switcheroo at all.

It isn't that far off the 12z consensus between the GFS/Euro...I'd tend to think the Euro has been more unstable with intensity rather than track (With Ernesto being a good example of this).

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Yeah, yeah. Contaminated garbage. It can brush the Outer Banks as a 60-kt extratropical slopgyre for all I care.

I'm not going to pay attention to the tropics until we have a true, clean sample to track.

Given that the shear picks up substantially north of the Caribbean, this is a valid scenario if Isaac takes an east-of-GFS track. :lol:

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Ends up heading NW/WNW into Central Louisiana...

What a bizarre run.

The important inflection point remains the interaction with Hispaniola and the subsequent mid-level ridge building that takes place afterwards. The biggest differences I see at this time period are:

A. GFS remains very strong with the cyclone through Hispaniola and remains vertically stacked. The ECWMF decouples the circulation and does not remain vertically stacked.

B. Its around this point where the ECMWF keeps growing the mid-level ridge... the GFS does not.

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What a bizarre run.

The important inflection point remains the interaction with Hispaniola and the subsequent mid-level ridge building that takes place afterwards. The biggest differences I see at this time period are:

A. GFS remains very strong with the cyclone through Hispaniola and remains vertically stacked. The ECWMF decouples the circulation and does not remain vertically stacked.

B. Its around this point where the ECMWF keeps growing the mid-level ridge... the GFS does not.

Yeah it definitely was odd. Looked like it was about to latch on to what the GFS has been showing but like you said the rebuilding ridge keeps shunting it further W.

Euro is an incredible outlier now.

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Yeah it definitely was odd. Looked like it was about to latch on to what the GFS has been showing but like you said the rebuilding ridge keeps shunting it further W.

Euro is an incredible outlier now.

Yeah it looked like it was gonna go through the SW part of Hispaniola like the GFS and then re emerge in the SW bahamas. But instead it just turns west. Not much support for this

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Earlier tidbit from HPC. Euro v GFS.

NWS HYDROMETEOROLOGICAL PREDICTION CENTER COLLEGE PARK MD

342 AM EDT TUE AUG 21 2012

ADDITIONALLY...THE GFS BECOMES QUESTIONABLY FAST WITH A

SHORTWAVE TROUGH CROSSING THE PLAINS ON DAY 5 AND THUS IS NOT

PREFERRED COMPARED TO THE BETTER SUPPORTED ECMWF SOLUTION. FOR

DAYS 6-7/MON-TUE...GENERALLY PREFER THE ECMWF ENSEMBLE MEAN

BLENDED SLIGHTLY WITH THE OPERATIONAL ECMWF FOR AMPLITUDE. THIS

APPROACH IS ALSO USED FOR THE TRACK OF TD NINE CURRENTLY NEARING

THE CARIBBEAN SEA...WHICH WAS COORDINATED WITH THE NHC YESTERDAY

AFTERNOON TO REACH SOUTHERN FLORIDA BY DAY 6/MON.

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348 AM EDT WED AUG 22 2012

VALID 12Z SUN AUG 26 2012 - 12Z WED AUG 29 2012

.WHILE A BROAD WEAKNESS IN

MID/UPPER LEVEL HEIGHTS LINGERS OVER THE EAST COAST. DESPITE THE

COMPLICATED SHORTWAVE PATTERN EMBEDDED WITHIN THE LONGWAVE

FLOW...MODEL AGREEMENT IS QUITE GOOD THROUGH ABOUT DAY

4/SAT...WITH ALMOST ANY SOLUTION QUITE GOOD...EXCEPT FOR PERHAPS

OVER SASKATCHEWAN/ONTARIO WITH THE 00Z GFS SUSPICIOUSLY QUICK AND

APPEARING TO SUFFER FROM CONVECTIVE GRID-SCALE FEEDBACK.

BEGINNING WITH DAY 5/SUN HOWEVER...THE SPREAD QUICKLY INCREASES

PARTICULARLY WITH THE NORTHERN BRANCH OF THE JET CROSSING

CANADA...WITH THE GFS THE FIRST SOLUTION TO DEVIATE MOST FROM THE

CONSENSUS AND THUS LESS PREFERRED COMPARED TO THE 00Z ECMWF AND

ITS OWN ENSEMBLE MEAN...WHICH WILL FORM THE BASIS OF THE

PRELIMINARY PRESSURES/FRONT. REGARDING TS ISAAC...THE SOLUTION

SPREAD IS EXTREMELY LARGE...WITH THE 00Z CANADIAN THE FIRST TO

CURVE ISAAC TO THE NORTH...BRINGING ISAAC TOWARD MYRTLE BEACH BY

NEXT MONDAY...

WHILE THE GFS/UKMET AFFECT SOUTHERN FLORIDA...AND ECMWF ACROSS

WESTERN CUBA BEFORE ENTERING THE GULF OF MEXICO. WILL USE THE

LATEST POINTS RELAYED IN THE 08Z COORDINATION CALL WITH THE NHC

FOR DAYS 3-5...BEFORE BLENDING DAYS 6/7 WITH YESTERDAY'S

COORDINATED POINTS. REFER TO THE NHC FOR THE LATEST FORECAST FOR

TS ISAAC.

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OK, I looked at the 00Z Euro myself, and, actually, it doesn't look that weird. It seems like a believable lifecycle. (Well, the strengthening up to landfall on the C Gulf Coast is maybe a little weird, but...)

Anyhoo, just wanted to save this for posterity:

post-19-0-58703400-1345623962_thumb.gif

Wait, what?

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