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


NickD2011

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MODEL DIAGNOSTIC DISCUSSION

NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD

1127 AM EST SUN JAN 09 2011

VALID JAN 09/1200 UTC THRU JAN 13/0000 UTC

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

INGEST...

12Z NAM AND GFS EVALUATIONS

ANY INITIALIZATION ERRORS WITH THE NAM AND GFS DO NOT APPEAR TO

SIGNIFICANTLY IMPACT THEIR SOLUTIONS.

...WAVE LIFTING THROUGH THE SOUTHEAST DAY 1...

THE NAM IS SLIGHTLY FLATTER AND MORE SHEARED WITH THIS WAVE THAN

THE GFS AND MOST RECENT EUROPEAN CENTRE GUIDANCE.

...VORTEX TRACKING ACROSS THE CENTRAL STATES DAYS 1 AND 2...

THE NAM AND GFS HANDLE THIS CIRCULATION COMPARABLY TO THE MOST

RECENT EUROPEAN CENTRE GUIDANCE.

...WAVE COMING INTO THE WEST COAST EARLY DAY 3...

THE NAM AND GFS HANDLE THIS WAVE COMPARABLY TO THE MOST RECENT

EUROPEAN CENTRE GUIDANCE.

...CYCLOGENESIS SOUTH OF LONG ISLAND DAY 3...

THE NAM IS CONSIDERABLY WEST OF THE MOST RECENT EUROPEAN CENTRE

GUIDANCE WITH THE DEVELOPMENT AND TRACK OF THIS LOW. THE GFS

TRACKS CLOSER TO THE 00Z ECMWF...BUT IS SLIGHTLY FASTER AND LESS

INTENSE.

...MODEL TREND GRAPHICS AT WWW.HPC.NCEP.NOAA.GOV/HTML2.SHTML...

...500 MB FORECASTS AT

WWW.HPC.NCEP.NOAA.GOV/H5PREF/H5PREF.SHTML...

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Anyone have the pics of the GFS ensembles, from what I see in the NE thread looks like a 8-12" storm for the area?

You can't really use the ensemble to get a good read on the QPF, let alone the snowfall. It's low track and 500mb evolution is very similar to the GFS ops, so all I would say is that it is confirmation of the op.

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It's unlikely for this to go too far east like the Ukmet and Nogaps depict because the blocking breaks down and the trough axis is far enough west to allow the storm to get close to the coast. Not to mention, when you have a primary located in the OV or PA, you're not going to have a secondary too far offshore

Trust me, a lot of times that's how we get screwed over, because the secondary doesn't form far enough east and we get rain.

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Seems 12+ may be generous along coastal areas (Eastern LI, Cape, Nantucket, Jersey shore) where mixing may be a concern.

I don't know of any model at this point that is showing mixing issues for LI and the Jersey shore. The NAM had been showing that yesterday but switched to a colder solution today.

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Def looks good and takes a perfect track, but I always remind people that the JMA has a very deceptive color scheme that makes it look worse than it is. the bullseye on that map is .75-1 inch qpf. You see colors like that on other model runs and it indicates a lot more precip.

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Def looks good and takes a perfect track, but I always remind people that the JMA has a very deceptive color scheme that makes it look worse than it is. the bullseye on that map is .75-1 inch qpf. You see colors like that on other model runs and it indicates a lot more precip.

There would be a little more after 72.

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