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March 13 - 15 Major Winter Storm Potential


NEG NAO

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3 minutes ago, weatherlogix said:

Having just quickly looked at the h5 maps from Jan 87 and Feb 95, I think Feb 95 might be a better analogy. Thoughts?

February 1995 didn't have much cold air in place before the storm. This one does.

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1 minute ago, jm1220 said:

What a tough forecast for coastal areas especially for NYC and western LI/coastal CT. GFS would be 12-18", NAM would be half that. Hopefully the colder models are winning out-GFS finally did correct west to the consensus. Importantly the mid level lows track on a good path for NYC, eastern LI still mixes toward the end.

This is flatly false.  The NAM would not support 6-9" for NYC.   The range is actually quite narrow among all the models, though how they get there varies a bit. 

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2 minutes ago, jm1220 said:

What a tough forecast for coastal areas especially for NYC and western LI/coastal CT. GFS would be 12-18", NAM would be half that. Hopefully the colder models are winning out-GFS finally did correct west to the consensus. Importantly the mid level lows track on a good path for NYC, eastern LI still mixes toward the end.

I still like my earlier call of 12-18" for the immediate NYC area. Less for LI and a lot more North and West.

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On to 12z 3/13

QPF range NYC area / Snowfall

 

SREF: 1.50 - 1.75 / 10 - 18"  (mixing)
NAM: 2.00 - 2.15 /  12 - 18"  (mixing)
PNAM: 2.15 - 2.30  : 14 - 20" (less mixing)
GFS: 1.50 - 1.75 / 12 - 22 " 
GEFS:
RHEM: 2.00 - 2.15 / 10 - 18" (mixing)
GGEM:

GGEM-ENS:
UKMET:
ECM:
ECM-EPS:
JMA:

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Updated Mt Holly WSW text

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
1200 PM EDT Mon Mar 13 2017

...An extreme situation is developing for portions of our area as
a MAJOR COASTAL STORM interrupts our usual daily routines on
Tuesday...

.A very strong winter storm could be life threatening for those
who do not pay attention to safety precautions Tuesday morning.
Low pressure developing off the Carolina coast this evening will
become an intense storm as it moves east of New Jersey midday
Tuesday. Swaths of excessive precipitation will develop along and
west of the track of the storm. Near blizzard conditions are
likely for a few hours in eastern Pennsylvania and portions of
northern New Jersey where snowfall rates of 2 to 4 inches per hour
are expected.


NJZ001-007>010-015-PAZ054-055-060>062-101>106-140400-
/O.CON.KPHI.WS.W.0003.170314T0000Z-170314T2200Z/
Sussex-Warren-Morris-Hunterdon-Somerset-Mercer-Carbon-Monroe-
Berks-Lehigh-Northampton-Western Chester-Eastern Chester-
Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Newton, Washington, Morristown,
Flemington, Somerville, Trenton, Jim Thorpe, Stroudsburg,
Reading, Allentown, Bethlehem, Easton, Honey Brook, Oxford,
West Chester, Kennett Square, Collegeville, Pottstown,
Norristown, Lansdale, Chalfont, Perkasie, Morrisville,
and Doylestown
1200 PM EDT Mon Mar 13 2017

...WINTER STORM WARNING REMAINS IN EFFECT FROM 8 PM THIS EVENING
TO 6 PM EDT TUESDAY...

* LOCATIONS...Eastern Pennsylvania and much of northern New
  Jersey.

* HAZARD TYPES...Heavy snow and strong winds.

* ACCUMULATIONS...Snow accumulation of 18 to 24 inches. Very high
  confidence!

* TIMING...Snow begins between 10 PM and midnight from southwest
  to northeast across the warning area, becoming heavy at times
  with snowfall rates of Three to four inches per hour for several
  hours Tuesday morning. Snow will diminish late in the day
  Tuesday.

* IMPACTS...The heavy snow combined with blowing and drifting will
  make many roads impassable.

* WINDS...Northeast 10 to 20 mph with gusts up to 35 mph.

* VISIBILITIES...One half mile or less at times.

* TEMPERATURES...From the mid 20s to lower 30s.
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5 minutes ago, weatherlogix said:

it is not east - it is slightly west with the surface low

 

the biggest issue with keeping this all snow is the terrible track the h7 low takes...west of us.

If the low was still intensifying that 700 track would be atrocious.  However due to occlusion ( even if we mixes on the GGEM for a time) that's an almost all snow event.  

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1 hour ago, SnowGoose69 said:

I guess this may join the 1961 and 1993 storms as the only ones to have front enders of 12+

Feb 1961? That one had a strong front and back end, JFK got 24.1" with like 2.7" LE with sleet and rain for a few hours in the middle

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2 minutes ago, LongBeachSurfFreak said:

The last minute SE shifts cannot be denied based on history. This is the opposite version of jan 15 where a SE shift helps us tremendously. These bombs like to follow the Gulf Stream end of story 

Often models understand how energetic systems are and overadjust to a west and amped track, and then adjust slightly back east later based on the progressiveness of the pattern. That might be happening here.

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5 minutes ago, LongBeachSurfFreak said:

The last minute SE shifts cannot be denied based on history. This is the opposite version of jan 15 where a SE shift helps us tremendously. These bombs like to follow the Gulf Stream end of story 

This has gotta be why Mt. Holly hasn't pulled the plug completely on SENJ yet. Their latest discussion is even more bullish. I'm expecting a mainly rain event, but I wouldn't be surprised if a S-SE expansion of the frozen perceip shield shows itself in nowcasting  

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Just now, jm1220 said:

Often models understand how energetic systems are and overadjust to a west and amped track, and then adjust slightly back east later based on the progressiveness of the pattern. That might be happening here.

The slight East tick today on some models is just noise. E LI will mix. The city proper is a very close call.

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