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Jan 4-6 Coastal Bomb


Baroclinic Zone

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1 minute ago, 40/70 Benchmark said:

I have never seen anything like this...at the risk of hyperbole, I was really trying to articulate that in my blog....I mean, 94mb pressure gradient? Yikes....like, and then James woke up and washed his sheets.

I would have been ashamed to suggest that as possible.

This could do some strange, Dec 23, 1997 like things that are going to just violate a lot of forecasts.

Sometimes when I see these really intense solutions I'll step back and try to figure out if it's completely garbage or if it's trying to suggest something. In this case I think this is trying to tell us something and what the NAM is saying that there will be a great deal of moisture getting thrown into this system and a tremendous amount of warm/moist air (+10C at 850) getting thrown into air that is like -5C at 850mb. There is just so much lift that there will be exceptional moisture being lifted into the SGZ which in the 12-18K range with -15C isotherm going right through it. Now...winds are likely going to rip dendrites apart but this band will have 3-5'' per hour rates and that band is going to persist and sit somewhere for upwards of several hours. To get 2''+ QPF you need many factors...we have those factors here. 

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1 minute ago, CoastalWx said:

I think weenies out west from to look at the H6 lift. That seems to be near the DGZ as this will have some warmer air wrapping in. To me, that says we may have a good weenie band well west of the QPF queen band. Like pretty far west.

Probably like green mountains I’m thinking 

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2 minutes ago, weatherwiz said:

Sometimes when I see these really intense solutions I'll step back and try to figure out if it's completely garbage or if it's trying to suggest something. In this case I think this is trying to tell us something and what the NAM is saying that there will be a great deal of moisture getting thrown into this system and a tremendous amount of warm/moist air (+10C at 850) getting thrown into air that is like -5C at 850mb. There is just so much lift that there will be exceptional moisture being lifted into the SGZ which in the 12-18K range with -15C isotherm going right through it. Now...winds are likely going to rip dendrites apart but this band will have 3-5'' per hour rates and that band is going to persist and sit somewhere for upwards of several hours. To get 2''+ QPF you need many factors...we have those factors here. 

I dropped a 20-bomb on my first call and and thinking long and hard about where I go from here.

You don't need a lot of time to get stupid in a system of this ilk.

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3 minutes ago, weatherwiz said:

Sometimes when I see these really intense solutions I'll step back and try to figure out if it's completely garbage or if it's trying to suggest something. In this case I think this is trying to tell us something and what the NAM is saying that there will be a great deal of moisture getting thrown into this system and a tremendous amount of warm/moist air (+10C at 850) getting thrown into air that is like -5C at 850mb. There is just so much lift that there will be exceptional moisture being lifted into the SGZ which in the 12-18K range with -15C isotherm going right through it. Now...winds are likely going to rip dendrites apart but this band will have 3-5'' per hour rates and that band is going to persist and sit somewhere for upwards of several hours. To get 2''+ QPF you need many factors...we have those factors here. 

Great post. I believe Scott has mentioned the whole shredded dendrites in wind issue is often overblown.

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1 minute ago, 40/70 Benchmark said:

I dropped a 20-bomb on my first call and and thinking long and hard about where I go from here.

You don't need a lot of time to get stupid in a system of this ilk.

I can certainly see it up your way. I think the max potential we're looking at in this system if things play right is like 18-24'' with maybe some 26'' totals? Back my way I'm just way too torn to attempt a map. I can see something like 3-6'' or even 12-18'' if it became apparent great banding set up this way. I'm hoping 0z runs will offer a bit more confidence in how to hedge. These systems are just a mess to try and explain to folks...I feel for TV meteorologists in this case b/c they're limited with on air time...luckily there is blogging now and facebook live and things of that nature to help 

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4 minutes ago, Hoth said:

Great post. I believe Scott has mentioned the whole shredded dendrites in wind issue is often overblown.

Thanks. 

It's a tough one. It probably is overblown to some extent. Not sure exactly how much research has been done into this but there probably is some sort of threshold in which when winds reach a certain level they can start having an influence on dendrites. I would also think the wind is more likely to rip them apart when you're dealing with the real fluffy snow...the high ratio type stuff

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1 minute ago, weatherwiz said:

Thanks. 

It's a tough one. It probably is overblown to some extent. Not sure exactly how much research has been done into this but there probably is some sort of threshold in which when winds reach a certain level they can start having an influence on dendrites. I would also think the wind is more likely to rip them apart when you're dealing with the real fluffy snow...the high ratio type stuff

It's more of the dendrites hitting the ground, smashing, and then being dragged across..thus ruining ratios.

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