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1/21/11 Storm Discussion III


ConvectiveSolutions

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After seeing the NAM/GFS I have no clue as to why Kevin keeps saying widespread 6-12''...I just don't see it. I'm sticking with my previous call...3-6'' for all of CT and RI and much of MA except for E. MA where 4-8'' and possible 9''/10'' amounts.

Well, if a lot of folks get 6-7" (still possible), he will claim a win.

Ryan's call looks good. Not sure about up here. 4-6"

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Just go with what ever model shows the most snow. It's OK because next week you'll be trashing that model until it shows the next major hit at day 7.

I've been consistent in why I think the NAM is failing and post maps almost every time. It was once by far my favorite model, the 6-12 hour wild swings are too much and at some point when the pattern changes next year and it's still not doign well maybe we'll take a look as to why. That said no model was great, but all were in the .3 to .5 ballpark for the last day or so barring a run here and there. Which is in the end what the 0z GFS and RGEM are forecast tonight.

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I have to say the 6-12 scenario seems very unlikely right now lol

6-10. Big ratios. When this thing hits the water it's going to town. I'm going to sleep...been a long week traveling in awful conds Tues and dead tired. Will be up early for (hopefully) some good news.

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Looks better by you.

Not thinking more than 4 or 5 back here

Some of your upslope areas are going to town I think. Kevin may do quite well. But I don't know the microclime there so well so I defer....

Was just out walking the dog. Solid ov with moon almost obscured....dimly vis still but obscuring fast.

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Well, if a lot of folks get 6-7" (still possible), he will claim a win.

Ryan's call looks good. Not sure about up here. 4-6"

I could see NE MA getting 6-7'' widespread but not in CT...I think in CT 3-5'' will be the main say...obviously some isolated higher totals but they will not be widespread. I'm glad I've stuck with 3-6''.

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I've been consistent in why I think the NAM is failing and post maps almost every time. It was once by far my favorite model, the 6-12 hour wild swings are too much and at some point when the pattern changes next year and it's still not doign well maybe we'll take a look as to why. That said no model was great, but all were in the .3 to .5 ballpark for the last day or so barring a run here and there. Which is in the end what the 0z GFS and RGEM are forecast tonight.

You are entirely correct on this one good sir. Today it has been atrocious. I really thought it had captured it again at 12z but nope. Amazing. Unlike some people I enjoy that part of the ride, too. It hasn't disappointed and has been fascinating even if it ends up breaking some hearts with the actual outcome. The system was a solid advisory and limited low-end warning event for some days ago...and that's what it is now. I still hope/think we can grab some nice ratios for some folks and see a couple strong totals.

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4-8 is most likely. There should be pretty solid ratios so even 0.30" is going to produce 4 or 5 inches. Someone will probably get lucky and pull off a nice lolli.

But there have been a few things going against a 10-12" total...

A) Vortmax core does not pass south of us...it either goes almost overhead or NW of us.

B. Speed of system...this is a 6-8 hour event for the meaningful snow.

C) No closed mid-level center (700mb)...this is related to the first point listed

The caveats are...

A) There's always exceptions....look at 12/23/97.

B. There is some hint that banding will occur in this storm, so anyone who gets a nice band for a couple hours will cash in

C) Small system with heavy dependency on vortmax interaction...so modeling will have trouble...which has been obvious by the flip flops we've seen in the past 36 hours.

At any rate, this should be a fun system to nowcast. Won't be a huge event most likely, but a nice moderate snowfall with perhaps a few surprises up its sleeve.

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4-8 is most likely. There should be pretty solid ratios so even 0.30" is going to produce 4 or 5 inches. Someone will probably get lucky and pull off a nice lolli.

But there have been a few things going against a 10-12" total...

A) Vortmax core does not pass south of us...it either goes almost overhead or NW of us.

B. Speed of system...this is a 6-8 hour event for the meaningful snow.

C) No closed mid-level center (700mb)...this is related to the first point listed

The caveats are...

A) There's always exceptions....look at 12/23/97.

B. There is some hint that banding will occur in this storm, so anyone who gets a nice band for a couple hours will cash in

C) Small system with heavy dependency on vortmax interaction...so modeling will have trouble...which has been obvious by the flip flops we've seen in the past 36 hours.

At any rate, this should be a fun system to nowcast. Won't be a huge event most likely, but a nice moderate snowfall with perhaps a few surprises up its sleeve.

Great post. It is what we think it is...high impact, high end advisory to low end warning event.

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