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March Medium Range Discussion


nzucker

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Looks like the 2nd later impulse will have a pretty strong affect on the third (if there is a 3rd). If the overunning/Monday system is strong it will surpess kill the 3rd (EURO)...if the Overunning/Monday event is weaker further south/less amplified it will allow the 3rd system to be more of a factor (GFS). We shall see....

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that's an impressive high and it wasn't as strong on the 00z run

Yeah much of that comes down to the handling of the PV and interactions over Canada. So I think we'll see many fluctuations over the next few days.

It really is an impressive feature on this run though...really dominates the pattern when you glance at the surface maps. Would be quite a sight to see those type of neg departures with that firm of a high pressure in control.

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with surface  temps above freezing mid to upper 30's at least   during the day and closer to lower 30's at night - in order  for any snow that falls to actually stick in the immediate NYC metro the precip has to fall at night and be moderate to heavy - which is questionable this far out - areas further north and west would probably be cold enough - so there is no guarantee this is an all snow event with surface temps near or above freezing in mid march the closer you get to the coast

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with surface temps above freezing mid to upper 30's at least during the day and closer to lower 30's at night - in order for any snow that falls to actually stick in the immediate NYC metro the precip has to fall at night and be moderate to heavy - which is questionable this far out - areas further north and west would probably be cold enough - so there is no guarantee this is an all snow event with surface temps near or above freezing in mid march the closer you get to the coast

Verbatim with that strong high and preciep rates this will be all snow to the beaches. Most places had 3-7 the other day with horrible air mass. Surface temps are plenty cold this go around verbatim

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with surface  temps above freezing mid to upper 30's at least   during the day and closer to lower 30's at night - in order  for any snow that falls to actually stick in the immediate NYC metro the precip has to fall at night and be moderate to heavy - which is questionable this far out - areas further north and west would probably be cold enough - so there is no guarantee this is an all snow event with surface temps near or above freezing in mid march the closer you get to the coast

Not to mention the ECM ensembles look warmer then the OP

 

post-342-0-75937500-1363122240_thumb.gif

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Verbatim with that strong high and preciep rates this will be all snow to the beaches. Most places had 3-7 the other day with horrible air mass. Surface temps are plenty cold this go around verbatim

Ironically, this is a much better airmass even though it's much later in the month. Using climo will burn you in this case because while the averages are going up, the PV is swinging around to this side of the pole and bringing a fresher arctic airmass. 

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with surface  temps above freezing mid to upper 30's at least   during the day and closer to lower 30's at night - in order  for any snow that falls to actually stick in the immediate NYC metro the precip has to fall at night and be moderate to heavy - which is questionable this far out - areas further north and west would probably be cold enough - so there is no guarantee this is an all snow event with surface temps near or above freezing in mid march the closer you get to the coast

According to the 12z EURO text from Accupro, the 6 hours ending at 0z tuesday have .52 of liquid(that's an inch of snow per hour), and surface temp at KNYC is 1.2, or 34.2F. With that rate of precip, it probably accumulates in manhattan(it's borderline, but probably good for 3-4" or so), and once you get into suburban NJ/westchester/CT it should have little trouble accumulating at the standard 10-1. the other good news is that most systems have trended colder in the near term(the blizzard was 4-8" after a heavy rain for NYC a few days out.) Still plenty of time, but I'm intrested.

-skisheep

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BIG signal here for mid/late March. Major arctic blocking, mid winter style on tap -- AO is progged to plummet down to near -4 SD by the 17th-20th period. So whether it's early next week's storm that does the dirty work, the potential several days later, or both, the potential is through the roof for the next couple weeks.

Classic severe AO drop akin to what we experienced in the 2009-10 winter.

I honestly don't ever remember being this excited for a mid/late March pattern. I'd be both shocked and disappointed if there isn't another accumulating snow event of at least 3" in NYC.

ao.sprd2.gif

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BIG signal here for mid/late March. Major arctic blocking, mid winter style on tap -- AO is progged to plummet down to near -4 SD by the 17th-20th period. So whether it's early next week's storm that does the dirty work, the potential several days later, or both, the potential is through the roof for the next couple weeks.

Classic severe AO drop akin to what we experienced in the 2009-10 winter.

I honestly don't ever remember being this excited for a mid/late March pattern. I'd be both shocked and disappointed if there isn't another accumulating snow event of at least 3" in NYC.

 

I haven't lost hope yet in Westchester...it's not just the -NAO signal but also the -EPO signal with the cut-off ridge north of Alaska forcing a lot of cold air into Canada and allowing for the PV to shift into Eastern Canada. 

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