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NYC/PHL Dec 26-27 Potential - Part 6


dryslotted

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Finally, Upton revised their morning discussion to explain their conservative rationale (to put it lightly, no pun intended), behind the limitation in their snow totals, apparently completely ignoring the 00Z GFS (the 06Z probably wasn't available when they posted their revision but probably wouldn't have made a difference since their reliance is being based upon the HPC/SREF/NAM QFP).

UPPER LEVEL TROUGH DEEPENS IN SOUTHEAST U.S. TONIGHT AS SURFACE

LOW PRESSURE MOVES FROM NEAR FLORIDA PANHANDLE TO OFFSHORE OF

CAROLINAS. MODELS IN PRETTY GOOD AGREEMENT WITH THIS THROUGH

TONIGHT. THEREAFTER...SOME DIFFERENCES ARISE AS THE UPPER LEVEL

TROUGH CLOSES OFF AND THE SURFACE LOW DEEPENS.

BY SUNDAY MORNING...THE SURFACE LOW WILL CONTINUE TO DEEPEN AND

MOVE IN A NORTHEAST DIRECTION. SNOW COULD START AS EARLY AS SUNDAY

MORNING BUT MOST OF WILL FALL SUNDAY AFTERNOON THROUGH SUNDAY

NIGHT TIMEFRAME. GENERALLY GFS AND ECMWF ARE SIMILAR WITH THE

ECMWF SHOWING A LARGE CHANGE BETWEEN 12Z AND 00Z RUNS FROM MORE

OFFSHORE TO CLOSER TO COAST. THE NAM AND GEM ARE FARTHER OFFSHORE

WITH THE SURFACE LOW WITH THE SREF IN BETWEEN. THE SREF HAS

TRENDED HIGHER WITH PROBABILITY OF MEASUREABLE PRECIP AS WELL.

THEREFORE...POPS INCREASED LIKELY TO CATEGORICAL FOR SUNDAY

AFTERNOON AND NIGHT AND WITH A BLEND OF HPC/SREF/NAM QPF AS WELL

AS ACCOUNTING FOR AROUND 10 TO 1 SNOW TO LIQUID RATIOS...SNOW COULD

ACCUMULATE GENERALLY 6 TO 9 INCHES WITH LOCALLY HIGHER AMOUNTS

ESPECIALLY FARTHER EAST OR IF MESOSCALE ENHANCED BANDING SETS UP.

THEREFORE WINTER STORM WATCH AS ISSUED TO ADDRESS THIS POTENTIAL

AND WITH HIGHER CONFIDENCE AS MODEL AGREEMENT HAS INCREASED

COMPARED TO PREVIOUS MODEL RUNS. STEEP GRADIENT IN PRESSURE AS LOW

PRESSURE DROPS DUE TO BAROCLINICITY WILL ALSO RESULT IN VERY GUSTY

WINDS 35 TO 40 MPH...WITH HIGHER CHANCE OF THESE WINDS TOWARDS THE

COAST.

DEEP SURFACE LOW PASSES FROM EAST OF CAPE COD TOWARDS NOVA SCOTIA

ON MONDAY...WITH SNOW GRADUALLY ENDING BY THE AFTERNOON. WINDS

WILL GRADUALLY SUBSIDE BY LATER MONDAY NIGHT AS LOW PRESSURE MOVES

FARTHER AWAY AND GIVES WAY TO HIGH PRESSURE STARTING TO BUILD IN

FROM SOUTHEAST U.S.

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Finally, Upton revised their morning discussion to explain their conservative rationale (to put it lightly, no pun intended), behind the limitation in their snow totals, apparently completing ignoring the 00Z GFS (the 06Z probably wasn't available when they posted their revision but probably wouldn't have made a difference since their reliance is being based upon the HPC/SREF/NAM QFP).

UPPER LEVEL TROUGH DEEPENS IN SOUTHEAST U.S. TONIGHT AS SURFACE

LOW PRESSURE MOVES FROM NEAR FLORIDA PANHANDLE TO OFFSHORE OF

CAROLINAS. MODELS IN PRETTY GOOD AGREEMENT WITH THIS THROUGH

TONIGHT. THEREAFTER...SOME DIFFERENCES ARISE AS THE UPPER LEVEL

TROUGH CLOSES OFF AND THE SURFACE LOW DEEPENS.

BY SUNDAY MORNING...THE SURFACE LOW WILL CONTINUE TO DEEPEN AND

MOVE IN A NORTHEAST DIRECTION. SNOW COULD START AS EARLY AS SUNDAY

MORNING BUT MOST OF WILL FALL SUNDAY AFTERNOON THROUGH SUNDAY

NIGHT TIMEFRAME. GENERALLY GFS AND ECMWF ARE SIMILAR WITH THE

ECMWF SHOWING A LARGE CHANGE BETWEEN 12Z AND 00Z RUNS FROM MORE

OFFSHORE TO CLOSER TO COAST. THE NAM AND GEM ARE FARTHER OFFSHORE

WITH THE SURFACE LOW WITH THE SREF IN BETWEEN. THE SREF HAS

TRENDED HIGHER WITH PROBABILITY OF MEASUREABLE PRECIP AS WELL.

THEREFORE...POPS INCREASED LIKELY TO CATEGORICAL FOR SUNDAY

AFTERNOON AND NIGHT AND WITH A BLEND OF HPC/SREF/NAM QPF AS WELL

AS ACCOUNTING FOR AROUND 10 TO 1 SNOW TO LIQUID RATIOS...SNOW COULD

ACCUMULATE GENERALLY 6 TO 9 INCHES WITH LOCALLY HIGHER AMOUNTS

ESPECIALLY FARTHER EAST OR IF MESOSCALE ENHANCED BANDING SETS UP.

THEREFORE WINTER STORM WATCH AS ISSUED TO ADDRESS THIS POTENTIAL

AND WITH HIGHER CONFIDENCE AS MODEL AGREEMENT HAS INCREASED

COMPARED TO PREVIOUS MODEL RUNS. STEEP GRADIENT IN PRESSURE AS LOW

PRESSURE DROPS DUE TO BAROCLINICITY WILL ALSO RESULT IN VERY GUSTY

WINDS 35 TO 40 MPH...WITH HIGHER CHANCE OF THESE WINDS TOWARDS THE

COAST.

DEEP SURFACE LOW PASSES FROM EAST OF CAPE COD TOWARDS NOVA SCOTIA

ON MONDAY...WITH SNOW GRADUALLY ENDING BY THE AFTERNOON. WINDS

WILL GRADUALLY SUBSIDE BY LATER MONDAY NIGHT AS LOW PRESSURE MOVES

FARTHER AWAY AND GIVES WAY TO HIGH PRESSURE STARTING TO BUILD IN

FROM SOUTHEAST U.S.

They probably dont know that the RGEM and MM5 are huge hits also. Honestly, this is looking as good or better than any storm from last year-- lets hope it holds.

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heres your snowfall map

snow+pic.jpg

I actually like this a lot better than the other maps, I can see the colors better ;)

I saw it in the other thread-- but its only out to 60 hours :( Is it over by then?

Basically had 2" QPF for Chesapeake Bay and Boston, 1 plus for everyone in between,..... 1.5 inch QPF for Jersey Shore and Long Island

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The ground looks pretty brown out there to me right now.....

and I hate it when they say "la nina" without qualifying it to moderate to strong lol.

BTW if this thing pans out it wouldnt be over until Tuesday Morning it looks like (72 hours).

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I posted in the 06Z main thread that I know one thing for sure in this period of uncertainty, and thats that CPK and EWR have zero chance of breaking their daily snowfall records for 12/26.

That was an amazing storm-- they say 2/06 broke its record (LA NINA BTW).... but Im almost sure there was more snow in 3/1888 and 12/47 than that!

3/1888 has reports of 26" from southern Bklyn and 38" from the north shore of Queens, so NYC probably got at least 30 inches in that one-- hard to measure with all the wind.

In any case, if we always measured snow at 6 hourly intervals, they would probably both have been over 30 inches. Perhaps Jan 1996 too.

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