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Models Have Us On Northern Edge Of Snow 3/4/16


bluewave

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Gefs, looks basically unchanged ,slightly less with amounts, though Suffolk county looks too be winner at this point. Possibly southern Jersey as well. Looking at the ensembles, unless I'm mistaken, looks like there's a cluster to the north of the low placement with a couple south at hours 54, and decent cluster to the west of low at hour 60.

Should be interesting to see 18z later on.

Looking at geps, it looks virtually unchanged, a slightly less precipitation amounts, but again, looks like Suffolk does best, and maybe southern Jersey. esembles are actually all over the place this run, however,there does appear to be a bunch of esembles to the west of the main low,at hour 60, though hour 54 looks too be more to the north of it then.

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RGEM was not pretty for anyone-except far South NJ and VA/MD

RGEM was ugly. The reason is that the strength of the overrunning was overdone in the last few days. The parent low just fizzles out and the well offshore coastal takes all the lift and qpf as it strengthens. Would not be surprised to see areas north and west of NYC just see flurries and snow showers with zero accumulation. This "event" gets less impressive with every run today
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RGEM was ugly. The reason is that the strength of the overrunning was overdone in the last few days. The parent low just fizzles out and the well offshore coastal takes all the lift and qpf as it strengthens. Would not be surprised to see areas north and west of NYC just see flurries and snow showers with zero accumulation. This "event" gets less impressive with every run today

I agree-the coastal is trending stronger and it's pulling into the QPF toward its center.  And that center is too far S and E to give us anything of note-thinking many get skunked on this one.

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The EPS has trended further N with the coastal and is now snowier for the 3rd run in a row.

You are looking at high res models at the edge of their envelope.

They are likely wrong.

Your snow now looks like it comes from the coastal and will primarily be relegated to the city and points S and E

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If you look at H5 the associated vort on the GFS actually jumped further NW.

 

The problem is that this Northern stream energy dropping down on the backside of the trough is too strong so it pushes it offshore. Keep in mind that it's the same energy making it the explosive nuke that it is, but we need it to either slow way down or weaken some and time is running out.

 

gfs_z500_vort_us_7.png

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Mount Holly's discussion.

.LONG TERM /THURSDAY NIGHT THROUGH WEDNESDAY/...

THU NIGHT THRU FRI AFTERNOON... LOW PRESSURE WILL STRENGTHEN OVER

THE NC COASTAL REGION THU NIGHT AND THEN TRACK NE WELL OFFSHORE OF

OUR WATERS FRIDAY. THE TRACK HAS TRENDED A LITTLE FURTHER NORTH

TODAY AND THE QPF/SNOWFALL FCST HAS EDGED UP A LITTLE TO REFLECT

THIS. THE GFS IS STILL A RATHER SIGNIFICANT OUTLIER WITH SNOWFALL

AMTS MUCH HIGHER THAN OUR PRESENT FCST. WE HAVE SIDED MORE WITH THE

12Z EC WHICH...IF TEMPS REMAIN COLD ENOUGH FRI...COULD PRODUCE 2-3

INCHES OF SNOW ACROSS THE DELMARVA AND INTO SRN NJ. AMTS FURTHER

NORTH WILL BE MORE LIGHT 1 TO 2 INCHES OVER NRN NJ AND NE PA. THE

SNOWFALL WILL BEGIN IN THE LATE EVENING (7-9 PM) ACROSS THE DELMARVA

AND CLOSER TO MIDNIGHT FURTHER NORTH. THE TOTAL TIME OF

PRECIPITATION WILL BE AROUND 8 TO 12 HOURS NORTH AND 12-18 HOURS

OVER THE DELMARVA. TEMPERATURES FRI OVER SRN NJ AND THE DELMARVA

MAYBE MARGINAL FOR SNOW, SO THIS IS A RATHER TRICKY SNOW FCST WITH

ONLY MOD CONFID IN AMTS ATTM. CONSIDERING CONFID LEVELS AND TIMING,

STILL A BIT EARLY OF ANY ADVSY ATTM. LIKELY NOT ENOUGH SNOW TO

JUSTIFY A WATCH. OVERNIGHT SHIFT CAN RAISE ANY NECESSARY FLAGS

OVERNIGHT.

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Precipitation has finally loaded on navgem and at hour 54, heavy stuff is on the montauk doorstep. South Jersey it's a little better at hour 42,48.

However at hour 54, there is no improvement,but in fact less precipitation for NYC,Jersey. Long Island however, is still snowing, with Rhode Island being pounded and the cape.

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