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Mid to late February Pattern Discussion...stormy or end of winter?


ORH_wxman

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I think we'll get snow from it, but it might not be a lot...the main s/w gets shredded a bit...but we do get the remnants passing under us which will give us easterly flow and some snows probably. Still aways out though and it could change and be stronger than models have it right now.

Sounds good . After a boring week and torch into 50's Tuesday we need something to look forward to
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NIce GFS run for the late week threat, looks like .5"+ all snow from NYC north and east(850s were borderline for here, assuming no sneaky warm layer down here should be good for mostly snow, could be some rain at the start and then quick changeover, most people on this forum should be all snow though.)

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I thought about starting an actual thread for this, but perhaps we can parlay here...

Rather abrupt, potentially ominous signal has emerged in the GFS ensemble derived teleconnector spread for the 20th - 5th of March. Hard to know what to hone in there, as there are several continental traversing mauler type systems - 18z has a robust Miller B for D6, and this system was flagged across several model types, and intervals off and on going back a couple days.

The CDC has suddenly exploded the PNA from a beginning point around -2.5 to -3SD, all the way to +1 in both the ESRL and NCEP channels. This is well enough matched by the CPC, where after a mere homage to a dip, there is a well concerted upward modality. CPC and CDC concur on a deep NAO interval, and based upon specific details in the nature/characteristic of the various ensembles and the operational (Euro op. is also on the same page) this looks higher than median confidence to be of the west-based variety. The could very well (ironically) turn out to be the best signal of the winter; whether that bears any fruit or not remains to be seen, but this is the first time that a well agreed upon teleconnector convergence has taken place.
CPC:
pna.sprd2.gif

CDC and notice the tandem heavily suppressed NAO, slightly weakens at the end when/as the PNA rises so significantly - that is a huge circulation system adjusting event signaled in there - major:
compare.pn.png


For what it is worth, the Euro derived NAO is also flagging a statically depressed to -2.5 SD NAO:
00zecmwfnao.gif

I realized I have spouted off about having been checked out for winter, and I still am, but personal druthers aside, that looks like some pretty fantastic Meteorology across that 2 weeks. wow. Very active and stormy pattern is signaled there. I like the Miller B idea for D6.5, but I also think the 25th -29th may be note worthy.   check that: 28th - 2nd.

Exception of the MJO... However, as I have stated in the past and still firmly believe, the MJO is really only as effective on the pattern when the general circulation is in constructive wave interference. The wave strength collapses toward the terminus during these ensuing index changes, anyway.

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