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NYC/PHL Potential Jan 11-14 Event Discussion Part Two


NickD2011

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saw in the other thread

NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD

1209 AM EST SUN JAN 09 2011

VALID JAN 09/0000 UTC THRU JAN 12/1200 UTC

...SEE NOUS42 KWNO ADMNFD FOR THE STATUS OF THE UPPER AIR

INGEST...

00Z NAM/GFS EVALUATION INCLUDING THE NEW UKMET/CANADIAN AND

PREFERENCES

INITIALIZATION ERRORS ARE DESCRIBED UNDER THE RELEVANT SYSTEM

HEADING.

...LOW PRESSURE MOVING FROM THE ROCKIES TO THE OHIO VALLEY THROUGH

THE PERIOD...

PREFERENCE: AFTER 00Z TUE...GFS

THE NAM INITIALIZES THE BASE OF THE SHORTWAVE TROUGH OVER

OREGON/IDAHO APPROXIMATELY 25 NM TOO FAR NORTH...WHICH CONTRIBUTES

TO AN INCREASINGLY SLOW AND DEEP SOLUTION ENTERING THE OHIO VALLEY

LATE IN THE FORECAST CYCLE COMPARED TO GFS/12Z ECMWF WHICH ARE

WEAKER AND MORE PROGRESSIVE. THUS...THE NAM IS DISCOUNTED

BEGINNING 00Z TUE. AMONG THE REMAINING GUIDANCE...THE ECMWF

WEAKENS THE LOW FASTER THAN THE GFS LATE IN THE PERIOD BUT

OTHERWISE MAINTAINS A SIMILAR PATH...WITH THE UKMET/CANADIAN MORE

LIKE THE GFS. THUS...DUE TO CONSENSUS RECOMMEND THE GFS.

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The main climatic change is that there has been little or no Appalachian Runner storm events in the past five years. These storms typically bring lots of snow to central PA, 2-4 inch snow events followed by ice storms from CAD setups in the Lehigh and Shenandoah Valleys and cold rain events to NYC, NJ and Philadelphia. I think we will return to this setup again by the end of the winter

If it wasn't for the blocking over the past month, there's little doubt we'd see the usual Nina train of cutters and the SE Ridge. There hasn't been much of a +PNA, and therefore without that block we'd likely have been torching all December. The storminess we've seen thus far has been a direct result of that block and the cold air transported south. The pattern has actually been more Ninoish thus far.

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If it wasn't for the blocking over the past month, there's little doubt we'd see the usual Nina train of cutters and the SE Ridge. There hasn't been much of a +PNA, and therefore without that block we'd likely have been torching all December. The storminess we've seen thus far has been a direct result of that block and the cold air transported south. The pattern has actually been more Ninoish thus far.

Yes I agree. La Nino would fit this pattern

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hr 84 sub 992 low over bm

.1-.25 lewes to northeast md to lns to towanda to alb

.25-.5 ac to nyc to alb

.5-.75 queens county on east

Wow, looks like another major hit. The weaker primary is definitely a good thing, as is the rapid deepening as it gets to east of NJ/DE. A quick hitter for sure but quite a pounding for a solid 12 hour period.

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