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The Pattern beyond Jan 12


ORH_wxman

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12z NAM took a step back, but hopefully the gfs continues the trend. Seems like most people may start frozen, but interior goes to ice and coast to a cold rain. Looks like the typical spots from sw NH and nrn orh county, out to the Berks have the best shot of sn/ip mix. Euro offers a decent storm around d6-7 or so. Hopefully a refresher for some tonight.

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12z NAM took a step back, but hopefully the gfs continues the trend. Seems like most people may start frozen, but interior goes to ice and coast to a cold rain. Looks like the typical spots from sw NH and nrn orh county, out to the Berks have the best shot of sn/ip mix. Euro offers a decent storm around d6-7 or so. Hopefully a refresher for some tonight.

I think we'd all welcome a nice icestorm

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Folks, if things break right we end up with a warning criteria icing event (who would have thunk during a La Nina...) on Tuesday+, followed by a larger mass field differential event on D7-9.

Don't count on appropriate boundary layer resolution ioutside of 60 hours, even by the superior resolved NAM. I have seen this many times in the past for intervals 60 to 84 hours, warm run, warm run, warm run, a little cooler, cold at 24-36. High pressure north is pinning polar-arctic hybrid air mass in place, and the great damming signature in the PP up and down the eastern seaboard at hour 60 is telling that there is probably more resistance there than would be normally expected for an eastward retreating high. Such that, most importantly a weak gradient low coming up underneath LI would definitely excite more ageostrophic drain than the even the NAM is seeing at this time range. Also doing so over anomalously large snow pack rim to rim from CAR to ALB. No guidance I saw off the 00z cycle was taking this thing truly west of SNE - though some were non-commital with a secondary appeal. I see the 31F isotherm lining up from NW CT to BED, with pockets of 32 strugglers with static ice from just N of HFD to NW RI, to the southwest 'burbs of BOS. Probably starts as snow everywhere before the character of the event flips to this description - even on the coast, but they go from snow to cold rain inside of I-95 down to PVD.

I also leave room open here for more discerned coastal cyclogenesis should the S/W coming on-board over the WC around 60 hours be somewhat weaker, thus allowing the lead (Tuesday dynamics) to be less damped. As far as total impact, it depends on the QPF but the Euro was pounding 1+" liq equiv, and now the 12z NAM is as well. Also , the Euro last night tried to commit more fully to secondary, and also has a nose of damming in the PP extending SW from NW GOM to ALBish, which signals that you'd be unwise to be 850 thermal field reliant for your surface p-type. [Edit: Oh yea, and *IF" said 60 hour S/W coming in out W is substantially stronger, the lead is less impactive and we're then monitoring a Miller A potential - not yet modeled)

I have less issue now with a more surpressed solution than was depicted earlier yesterday(s) because the overnight recalculations at CDC and CPC have the NAO slipping negative in increments beginning presently and leading to next weekend... Which leads nicely to the possible biggie out there in time.

The PNA is concertedly nearing +1 SD in the well-clustered 21 member GFS for multiple nightly EOFs at CPC, now the CDC is at least picking up on this in the initializaitons (showing a clear negative bias in the D4-7 lead predicitons). Taking these into account, we have strong PNA with negative differentiating NAO. Do not discount that deep amplification into a quasi-closed N stream low in the vicinity. It would not take much of a nudge to have all that evolve similarly to the KU even a few weeks ago. Stay tuned...

Major major damage

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GFS looks very suspect looking past the tue-wed event bringing down the arctic air

bleeds in the arctic air with nary a system up here

zero chance of that happening.

euro was interesting with a more substantial event along the EC, would make more sense but its likely overdone?

or perhaps the artctic intrusion never fully makes it?...will be interesting to see how it unfolds.

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