Retrograding Rex Block over East Canada
Posted by JAC on 12/16/2009, 6:58 am
http://www.nco.ncep.noaa.gov/pmb/nwprod/analysis/namer/gfs/06/index_500_mu_loop.shtml




PRELIMINARY EXTENDED FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
311 AM EST WED DEC 16 2009

VALID 12Z SUN DEC 20 2009 - 12Z WED DEC 23 2009

A FAIRLY COMPLEX LONGWAVE PATTERN IS EXPECTED TO PREVAIL DURING
THE MEDIUM RANGE PERIOD WITH A REX-BLOCK RETROGRADING FROM THE
NORTHERN ATLANTIC TO EASTERN CANADA...

A STRONG AND RETROGRADING POSITIVE ANOMALY AT HIGH LATITUDES OF
THE NORTH ATLANTIC AND CANADA FAVORS CLOSED CYCLONES UNDER ITS
BASE IN THE LOWER 40S LATITUDE.

...WITH ALL MODELS TRENDING
FARTHER OFFSHORE AND FASTER WITH A DEEPENING CYCLONE...WITH THE
ECMWF TAKING AN UNUSUAL TURN TOWARD THE WEST AS THE LOW REACHES
THE CANADIAN MARITIMES BY DAY 6. THUS...WILL STAY CLOSER TO THE
CONSENSUS BY THIS TIME WHICH CONTINUES TO EJECT THE LOW INTO THE
NORTHERN ATLANTIC. BEFORE THEN HOWEVER...
MODEL SOLUTIONS ARE QUITE CLOSE WITH THE TRACK OF THE LOW.


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Major Snowstorm( Saturday) Mid-Atlantic??? - Doorman, 12/15/2009, 6:59 pm
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