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12/29 - New Years Storm Threat Discussion


Dsnowx53

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HAZARDOUS WEATHER OUTLOOK

NATIONAL WEATHER SERVICE MOUNT HOLLY NJ

1018 AM EST THU DEC 27 2012

DEZ001-MDZ008-NJZ001-007>010-012>020-027-PAZ054-055-060>062-070-071-

101>106-281530-

NEW CASTLE-CECIL-SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-

WESTERN MONMOUTH-EASTERN MONMOUTH-MERCER-SALEM-GLOUCESTER-CAMDEN-

NORTHWESTERN BURLINGTON-OCEAN-SOUTHEASTERN BURLINGTON-CARBON-MONROE-

BERKS-LEHIGH-NORTHAMPTON-DELAWARE-PHILADELPHIA-WESTERN CHESTER-

EASTERN CHESTER-WESTERN MONTGOMERY-EASTERN MONTGOMERY-UPPER BUCKS-

LOWER BUCKS-

1018 AM EST THU DEC 27 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN DELAWARE...NORTHEAST

MARYLAND...CENTRAL NEW JERSEY...NORTHERN NEW JERSEY...NORTHWEST NEW

JERSEY...SOUTHERN NEW JERSEY...EAST CENTRAL

PENNSYLVANIA...NORTHEAST PENNSYLVANIA AND SOUTHEAST PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

A STORM TRACKING TO OUR SOUTH AND EAST SATURDAY AND SATURDAY NIGHT

SHOULD BRING A PERIOD OF ACCUMULATING SNOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY ULTIMATELY BE NEEDED.

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CONFIDENCE IS INCREASING IN A MODERATE TO SIGNIFICANT SNOWFALL FOR

THE REGION ON SATURDAY.

WEAK RIDGING WILL BE EXITING TO THE EAST EARLY SAT AS

DOUBLE-BARRELED LOW PRESSURE BEGINS TO APPROACH FROM THE WEST...

WITH ONE WEAKENING CENTER WEST OF THE CENTRAL APPALACHIANS...AND A

SOUTHERN STREAM LOW MOVING FROM THE GULF COAST TOWARD THE SE COAST.

THE LOW SHOULD EXIT THE SOUTHERN MID ATLANTIC COAST SAT AFTERNOON

AND STRENGTHEN SIGNIFICANTLY SAT NIGHT AS IT PHASES WITH THE NRN

STREAM. EARLIER RUNS OF THE ECMWF INDICATED THAT THIS PHASING WOULD

TAKE PLACE FAR ENOUGH EAST TO LIMIT POTENTIAL FOR SIGNIFICANT SNOW

TO THE FORKS OF LONG ISLAND AT MOST...BUT NOW THE 00Z ECMWF...IN A

SLIGHTLY MORE AMPLIFIED OVERALL PATTERN EXTENDING FROM THE NE

PACIFIC TO THE CONUS...SWINGS THE BOMBING LOW VERY CLOSE TO THE

40N/70W BENCHMARK SAT NIGHT...WITH SIGNIFICANT QPF FROM NYC METRO

EAST. THE 00Z GFS HAS MOVED TOWARD A MORE AMPLIFIED SOLUTION AS

WELL...AND LEAST HALF ITS ENSEMBLE MEMBERS...IN A NOD TO THE 00Z

ECMWF...ARE TRACKING NW OF THE OPERATIONAL RUN AND ARE MORE INTENSE.

THIS YIELDS HIGH CONFIDENCE IN AT LEAST ADVISORY CRITERIA SNOWFALL

OF 3 INCHES OR MORE FOR THE ENTIRE CWA...AND LOW TO MEDIUM

CONFIDENCE IN SIGNIFICANT SNOWFALL FOR LONG ISLAND AND SOUTHERN

CT...WHICH WILL BE HIGHLIGHTED IN HWO.

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as of 12 noon 12/27 this is a light to moderate - 2 - 5 inch snowfall for NYC metro here is the HPC qpf

http://www.hpc.ncep....fill_99qwbg.gif

Yeah as currently modeled this looks like a nice snow event for most of the area. Low end chance for 4" and temperatures should be cold enough to accumulate even along the coast (as it looks now). Maybe even upper 20s just inland, and subfreezing temperatures can make light snow events feel a lot snowier. The GGEM solution looks great for NYC and vicinity. But as others have mentioned, I'm a little concerned that the coastal might steal the show once it gets cranking as it would cutoff the forcing mechanisms further NW.

Any significant errors at h5 could make this more significant. 2/13/06 looked like a light snow event 2 days out. So you never know.

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