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Friday, January 21st Storm Discussion II


Baroclinic Zone

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I didn't threaten anyone!

There's a difference between a threat and a promise.

Anyhow, if the 12z NAM is on to something, you may well see 5" in CT (even if it's overdoing the QPF a bit; ratios should be a nudge generous for many places).

Would not matter anyways, We usually shoot first and ask questions later when strangers drive up......... :lol:

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12/23/97 is coming for a visit.

I'll never forget that one. The forecast wasn't even enough to cancel school, and they ended up doing early dismissal right during the worst of it. My bus got stuck multiple times on the way home - the kids had to get out and try to dig the bus out.

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What's the theory on why at this point? It seems to be getting worse not better.

Would agree with Will though that the Euro has essentially been at least an advisory even for the last day or so. And it ramped up considerably at 0z. Watch it go out to sea this run :)

RGEM has been pretty darn consistent, it insisted on a track further west than every other model FWIW.

Well nrn stream systems tend to do that. Sometimes the models don't catch onto this until about 36 hrs out. When all the energy comes into the US, models seem to strength the nrn stream on their solutions...perhaps because of balloon coverage. Combine that, and the srn stream shortwave dancing around very close in proximity..trying to phase, and you get a nw trend. It also seems like the models are finally bring the low closer to the best PVA. It was quite displace on yesterday's runs.

Looking at critical thicknesses, it seems mostly snow for you as of now. Jackpot on the NAM seems from near central CT ene through ORH and BOS..perhaps 30 miles either side..esp to the north.

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Yeah, not sure about the time stamp, says 1pm today must be off from the time zones/UTC. I'm thinking that was from pre-NAM.

Face value it would rain quite a bit down here and if carried throughout the rest of the models who's to say it's not done going NW?

Timestamp(s) are fixed on his site. I noticed it a week or so ago, seemed like everything was off by 6 hours. It shows 712am now...Hi Phil. :mapsnow:

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Well nrn stream systems tend to do that. Sometimes the models don't catch onto this until about 36 hrs out. When all the energy comes into the US, models seem to strength the nrn stream on their solutions...perhaps because of balloon coverage. Combine that, and the srn stream shortwave dancing around very close in proximity..trying to phase, and you get a nw trend. It also seems like the models are finally bring the low closer to the best PVA. It was quite displace on yesterday's runs.

Looking at critical thicknesses, it seems mostly snow for you as of now. Jackpot on the NAM seems from near central CT ene through ORH and BOS..perhaps 30 miles either side..esp to the north.

Thanks Scott. How extensive is the balloon coverage in central and south central Canada and throughout the rockies...anyone know? It really seems that in this case it's the rockies system causing the change. As you and WIll noted there's a definite change in the handling of the energy coming out of the rockies with enough of a focus now to help amplify the whole thing. You can clearly see that in this animation showing the 0z 12h versus 12z init.

If the rest of the models bounce NW now it'd be interesting to see how the NCEP models handled those two features versus say the Euro which didn't make as harsh a move. The coverage theory would partially explain why we trend one way before snapping back - may be that as it falls away from a sampling site we lose the signature before it hits a coverage area and pops back.

When you look at the NAM 12h 0z vs 12z 0h the biggest change is the system out of the rockies. That I think sets the stage for everything else by helping to amplify things right away which in turn helps to draw the northern stream south.

(look at Missouri on the first panel, just WSW in the 2nd...the shift sw is the new run and notice it increases heights as a result in advance)

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what is the obsession with school cancellation? i the ne thread? i thought that was more ma nyc phl thread stuff

Well my entire memory of 12/23/97 is going to school with a 1-3 inch forecast (and it really was a 1-3 inch forecast), having early dismissal and a 1 1/2 hour bus ride because we kept getting stuck in some of the heaviest snow I've ever seen.

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