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December Pattern Disco- 2013


Damage In Tolland

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I think this is a good description of how we use the term. A latitude gradient in temperature anomalies (below avg north and above avg south) that is close enough to be relevant to our weather. If you go far enough in any direction you will find a latitude gradient in temperature anomalies...in some of our blowtorch years, you can find a nice latitude gradient between James Bay and Ellsmere Island. Not really relevant to us. Kind of like when we say "its a stormy looking pattern"...we usually mean for our general region. we don't say "its a stormy looking pattern" when Seattle is going to get smoked and we are under a parched ridge.

We will often specify another region's location if the descriptor refers to that area and not nearby.

yes what I was relaying to PF.
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Caddy

 

 

All the guidance right now is indicating big time CAD for that threat...its far enough out that it can change, but if we get this down to about 3-4 days out later this week with a similar looking setup on guidance, then I think we can start to get serious about a widespread winter impact for our region.

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:huh:

 

By 165 even the Rev is switching over

 

GFS coming in colder with the second wave of frontal precip and with a northerly flow expect it to change to snow.  Its seems like it brings another snowstorm through around the 9th, although the storm on the 18z run is in the Rockies currently.

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Yeah the Day 7 storm is not colder on the GFS..not sure where this model interpretation is coming from. Primary into the lakes

 

Im pretty sure he was talking about the impulse that comes through Friday night initially. Regardless, we have a seperate thread for that "threat".

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Yeah I was initially talking about the second impulse that moves through New England, but I guess the Dec 6-7th thread would of suffice.

 

However the Primary around day 7 doesn't intensify that strongly and is already producing a secondary east of Delmarva peninsula.  Its still a cold scenario, but not as snowy for SNE.

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That is a fugly primary position on the euro.  

SNE actually does better than your area when the primary goes wayyyy west in these situations because the max thrust of the mid level warm tongue misses us to the west....see Dec 16, 2007.....the development of the primary renders our mid levels more resistant to the waa.

 

I actually managed slightly better in Dec 2007, than 2008.....33.5" in the former, and 31" in the latter....however, as Will intimated, the snow had more staying power in 2008 owed to marginally colder overall regime.

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There wasn't a snow depth near 48", but i did have 50" of snowfall that month. I think the max depth approached 30" that month.

This is definitely the pattern where we tend to rack up the snow though. I like where we sit right now, but it's too far out to sweat details. The NAM even CADs us in the late week warmup ahead of the cold fropa. CAD season is upon us.

didn't the snow on the level approach 48 inches at some point that winter?  I am hoping for some action before I leave for the airport late afternoon sunday.

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SNE actually does better than your area when the primary goes wayyyy west in these situations because the max thrust of the mid level warm tongue misses us to the west....see Dec 16, 2007.....the development of the primary renders our mid levels more resistant to the waa.

 

I actually managed slightly better in Dec 2007, than 2008.....33.5" in the former, and 31" in the latter....however, as Will intimated, the snow had more staying power in 2008 owed to marginally colder overall regime.

yeah that makes sense.  Both our areas can cash in with these types of set ups but I need a further south primary to maintain frozen.  

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Good snows for the whole area next week?

 

Snow to ice potential ...two system within 3 or 4 days of one another.

 

Huge EPO cold load into Canada finds it's way into the central Plains/Lakes, and eventually... confluence up N sends a strong polar high through eastern Ontario as moderate strength, but moist system tries to lift in to the Lakes....  Intense CAD is in place and a weak commitment to secondary takes place, enough so to keep a strong N ageostrophic drain going on over SNE/central areas.  It would almost have to be a significant icing event in that scenario...  

 

Whole thing appears to repeat less than a week later.  Cold in between systems. 

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