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Tuesday over running event


Mitchel Volk

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12z gfs text output is good critical thickness wise for Long Island, but the 925-1000 hpa layer is warm (hr.27-hr 30) leading to an eventual mix.

 

kfrg:(Nassau)

 

http://68.226.77.253/text/GFS/GFS_kfrg.txt

 

kisp:(Suffolk- central)

 

http://68.226.77.253/text/GFS/GFS_kisp.txt

 

kmtp:(Suffolk- east end)

 

http://68.226.77.253/text/GFS/GFS_kmtp.txt

 

12z GFS bukfit has very little snow accumulation for LGA,JFK,ISP 0.5" or less using max temp in profile. I think it's too low though.There will more evaporative cooling at the start.

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I still think this is going to be nowcasting event regarding totals in any specific area of the metro since this is such a fragile dynamic setup - amount of precip and temp profiles etc etc which are very tricky in these situations - will definetly be a few surprises along the way

It's gonna be the case of whoever is further east and more urban areas with boundary layer issues will need heavier precip to snow and especially accumulate snow. The further nw areas will likely fare well with this situation.

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This will probably be like December 05 although the immediate coast will probably do better

February '07 might also be a good comparison -- don't remember the specific date, but it was a quick and unanticipated thump of ~6" for much of I-95.

 

This event looks to be more localized, with the potential for a narrow stripe of 10" totals somewhere over the NYC region.

 

In our 'new' climate, the potential for convective snows is often under-estimated, and we have seen several situations like this one in recent years. The commute is going to be a disaster... 

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The Euro looks a bit wetter, but still low numbers compared to the hi-res models. General 1/4" to 1/3" QPF for most. I know folks are banking on the northern stream/southern stream verification scores thing, but with the Euro not going bananas, I'm thinking this isn't going to be a memorable event.

Euro hasn't done well with a single northern stream storm tho so I would be cautious

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Yea boundary layer issues look inevitable there.

Yeah it's going to be hard to overcome the boundary layer issue even with heavy precipitation rates. I think now all of Long Island will have mixing issues, and not just the eastern end like I thought earlier.

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February '07 might also be a good comparison -- don't remember the specific date, but it was a quick and unanticipated thump of ~6" for much of I-95.

This event looks to be more localized, with the potential for a narrow stripe of 10" totals somewhere over the NYC region.

In our 'new' climate, the potential for convective snows is often under-estimated, and we have seen several situations like this one in recent years. The commute is going to be a disaster...

2/08..3-6" was forecast.. Most places did a bit better before turning to drizzle

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As of now, especially for Long Island South Shore residents..What is you estimated snow depth remaining?

 

At least tomorrow might add to it before it begins to subtract.

Worry about ur snow cover by Friday afternoon after 3 mornings of FOG.

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MT holly going 3-6

 

 

 

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
240 PM EST MON FEB 17 2014

NJZ001-007>010-012-013-015-PAZ054-055-060>062-103>106-180700-
/O.NEW.KPHI.WW.Y.0012.140218T0800Z-140218T1800Z/
SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-
WESTERN MONMOUTH-MERCER-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON-
WESTERN MONTGOMERY-EASTERN MONTGOMERY-UPPER BUCKS-LOWER BUCKS-
INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN...
FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...FREEHOLD...TRENTON...
JIM THORPE...STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...
EASTON...COLLEGEVILLE...POTTSTOWN...NORRISTOWN...LANSDALE...
CHALFONT...PERKASIE...MORRISVILLE...DOYLESTOWN
240 PM EST MON FEB 17 2014

...WINTER WEATHER ADVISORY IN EFFECT FROM 3 AM TO 1 PM EST
TUESDAY...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER
WEATHER ADVISORY FOR NORTHERN NEW JERSEY, THE POCONOS, LEHIGH
VALLEY, BERKS COUNTY AND THE NORTHERN PHILADELPHIA SUBURBS FOR
SNOW...WHICH IS IN EFFECT FROM 3 AM TO 1 PM EST TUESDAY.

* ACCUMULATIONS...SNOW ACCUMULATION OF 3 TO 6 INCHES.

* TIMING...SNOW SHOULD COME IN RAPIDLY OVERNIGHT AND FALL MODERATE
TO HEAVY AT TIMES THROUGHOUT THE MORNING COMMUTE. SNOW SHOULD
END CLOSE TO NOON ON TUESDAY.

* IMPACTS...ONE INCH PER HOUR SNOWFALL RATES ARE LIKELY TO OCCUR
DURING THE MORNING COMMUTE. THIS WILL MAKE DRIVING AND PLOWING
DIFFICULT. THE ADDITIONAL SNOW WILL CAUSE MORE STRAIN ON
WEAKENED STRUCTURES INCREASING THE CHANCES FOR COLLAPSES. ISOLATED
POWER OUTAGES ARE POSSIBLE.

* TEMPERATURES...IN THE MID 20S TO AROUND 30 DEGREES WHILE ITS
SNOWING, RISING ABOVE FREEZING LATER IN THE DAY TUESDAY, EXCEPT
IN THE POCONOS.

* VISIBILITIES...LESS THAN HALF A MILE AT TIMES.

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