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January 31-February 2 MAJOR Winter Storm


Powerball

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Sorry I can't read through all the previous posts, has anyone posted this yet?

MODEL DIAGNOSTIC DISCUSSION

NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD

1219 PM EST SAT JAN 29 2011

THE NAM AND GFS HAVE POTENTIALLY SIGNIFICANT INITIALIZATION ERRORS

OVER BRITISH COLUMBIA...

WITH THE NAM TOO WEAK AND NORTHEAST WITH THE CENTER OF THE

DEVELOPING SHORTWAVE TROUGH...

AND GFS TOO STRONG AND SOUTH. THESE DIFFERENCES CONTRIBUTE TO

GROWING SOLUTION DIFFERENCES OVER TIME...WITH THE GFS LESS

AGGRESSIVE IN DIGGING THE TROUGH INTO THE ROCKIES...A SOLUTION

WHICH IS DISCOUNTED DUE TO INITIALIZATION ERRORS AND ITS RELATIVE

POSITION WITHIN THE GUIDANCE ENVELOPE. MEANWHILE...THE

NAM...ALTHOUGH WITH INITIALIZATION ISSUES OF ITS OWN BUT NOT AS

MUCH AS THE GFS...PRODUCES A FORECAST CLOSE TO THE MODEL CONSENSUS

INCLUDING ENSEMBLES...AND THUS IS CONSIDERED REASONABLE.

OTHERWISE...THE NEW UKMET HAS TRENDED TOWARD THE 00Z ECMWF BUT IS

NOT AS FAR WEST NOR AS DEEP WITH THE UPPER LOW BY 84 HRS...AND

GIVEN ITS MORE RECENT AND MORE ACCEPTABLE

INITIALIZATION...PRODUCES THE MOST PREFERRED SOLUTION.

...UPPER LOW MOVING FROM N. CALIFORNIA TO TEXAS THROUGH THE

PERIOD...

PREFERENCE: UKMET

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