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NYC/PHL 1/25-27 potential Part III


NortheastPAWx

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HMMMMMMM....

Inland: NAM/GGEM

Scraper or BM: GFS/GEFS/Euro/Euro ens

Tough one rolleyes.gif

I thinik you really mischaracterize the Nam as being 'inland'. It may be inland at 84h but its clearly heading toward the coast well south of us... I would suggest that on its current track it reaches the coast near somewhere off Nothern Va or delaware... From there, its path is a guess. .But certainly, to characterize it as being inland, especially for areas around NY and New England is not correct.

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mt holly looks to be on it....i like them, good office.

TUESDAY...AM EXPECTING A PERIOD OF SNOW IN WHAT ATTM LOOKS LIKE A

PRELIMINARY EVENT PRIOR TO THE LARGER EVENT "POTENTIAL" BEYOND

THIS FORECAST PERIOD. THIS COULD BE ADVISORY SNOWFALL... ALBEIT

LOW PROB POTENTIAL ATTM . 12Z/22 GFS HAS ABOUT .05 TO .15 WATER

EQUIVALENT AND BOTH 09Z AND 15Z/22 SREF HAVE PROBS OF 70-90 PCT

FOR .01 OR GREATER IN A 6 HR PERIOD AND WITH .1 TO .25 LIQUID

WATER EQUIV THOUGH WITH 0.2 INCH SPREAD. THE 00Z/22 NAEFS HAD .2

OVER ALL THE AREA WITH SLIGHT QPF SPREAD... AND A PROB OF AT LEAST

.2 IN THE 50 TO 65 PCT RANGE. POPS WERE CONSERVATIVELY RAISED

COMPROMISING 09Z SREF WITH THE PRIOR 09Z/22 KPHI FCST.

MIXED PCPN IS SHOWING UP IN THE FCST OVER THE SOUTHERN THIRD OF

THE AREA AS PARTIAL THICKNESSES AND SFC TEMPS WARM. THE 12Z ECMWF

WAS MUCH WARMER THAN GFS GUIDANCE. TOOK A BLENDED COMPROMISE AS I

THINK THE ECMWF IS NOT SHOWING ENOUGH PCPN FOR THE DAYLIGHT HOURS

TUESDAY.

&&

.LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/...

MODEL GUIDANCE CONTINUES TO SHOW A COASTAL LOW...A NOR/EASTER...

AFFECTING PORTIONS OF THE EAST COAST TUESDAY NIGHT AND WEDNESDAY.

JUST HOW MUCH THIS STORM AFFECTS US IS LESS THAN CERTAIN AT THIS

EARLY TIME...BUT IT SEEMS PROBABLE THAT AT LEAST SOUTHERN AND

EAST-CENTRAL PARTS OF THE AREA WILL HAVE SOME PRECIPITATION

EFFECTS...AND PERHAPS SOME WIND AND COASTAL ISSUES AS WELL.

HOWEVER...THERE HAVE BEEN CHANGES IN THE STRENGTH AND LOCATIONS OF

PRESSURE FEATURES...THE EXTENT OF MOISTURE AND IMPLIED

PRECIPITATION...AND LOW LEVEL THERMAL FIELDS WITH THE 12Z RUN. THE

GFS HAS DE-AMPLIFIED THE UPPER TROUGH AND IS MORE ZONAL, LEADING

TO TRACK A BIT LESS CLOSE TO OUR AREA, AND LESS OF AN INTRUSION OF

LOW AND MID LEVEL MOISTURE. THE 12Z ECMWF HAS MOVED TOWARD...BUT

NOT QUITE TO...THE GFS SOLUTION. THE NET RESULT IS THAT, WITH

LOWISH CONFIDENCE IN MODEL SOLUTIONS, HIGH CHANCE PROBABILITIES

WILL BE KEPT EVERYWHERE. REGARDING PRECIPITATION TYPE, A CHANCE OF

SNOW WILL BE CONTINUED NORTHWEST...A CHANCE OF MIXED PRECIPITATION

WILL BE USED FOR CENTRAL AND NORTHERN PARTS OF THE SOUTHERN

ZONES...AND MOSTLY A CHANCE OF RAIN WAS USED FOR THE FAR SOUTH AND

SOUTHEAST.

THEN...A CHANCE OF SNOW SHOWERS WILL BE RETAINED FOR THE AREA

WEDNESDAY NIGHT IN THE WAKE OF THE STORM IN A NORTHWEST FLOW /

COLD AIR ADVECTION REGIME...THEN A CHANCE OF SNOW SHOWERS CENTRAL

AND NORTH THURSDAY MORNING...AND A CHANCE OF SNOW SHOWERS AND

FLURRIES NORTHWEST THURSDAY AFTERNOON AND THURSDAY NIGHT

RESPECTIVELY. DRY WEATHER IS EXPECTED FRIDAY INTO SATURDAY, BUT A

SLIGHT CHANCE OF SNOW SHOWERS WAS ADDED FOR SATURDAY NIGHT WITH A

VERY LOW CONFIDENCE LOW SHOWN FROM THE WEST-NORTHWEST ON THE

GFS...WITH A LESS AGGRESSIVE DEPICTION ON THE ECMWF.

UPPER TROUGHING CONTINUES TO TRY TO REFORM OVER THE EASTERN THIRD

OF THE COUNTRY THROUGH THE LONG TERM PERIOD. IT IS WONDERED IF HPC

TEMPERATURES MAY NOT BE COLD ENOUGH TOWARD THE END OF THE

PERIOD...BUT GUIDANCE TEMPERATURES WERE ACCEPTED FOR NOW.

Nice summary....

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You didnt get backside accumulating snow from that storm? I thought inland areas did better because they had more snow at the start.

As I recall we had a little to start and then it went to rain, I was in North Jersey Xmas day through 12/26 (they got around 8 inches where I was), but not much where I am

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