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March 19/20 Potential Winter Event


stormtracker

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^^ Perhaps, though the surface high sliding off the New England coast isn't as ideal for feeding in colder air at the surface compared to a placement a little further west over the GL.

I don't agree completely there.

 

In December, maybe, but this late in the season a New England high is just fine.

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Except it's transitioning to not even being a New Englans high since it's moving off the coast. You can start to get more ocean temp influence rather than interior New England temp influence.

I see the metrogram for the Ukie shows surface temp & even 850 mb temp near the freezing mark at 12z Sunday, but hard to say what the atmospheric makeup will be after that point (those parameters only go out 72 hrs), especially if the surface high continues to move further out to sea.

I don't agree completely there.

In December, maybe, but this late in the season a New England high is just fine.

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Except it's transitioning to not even being a New Englans high since it's moving off the coast. You can start to get more ocean temp influence rather than interior New England temp influence.

I see the metrogram for the Ukie shows surface temp & even 850 mb temp near the freezing mark at 12z Sunday, but hard to say what the atmospheric makeup will be after that point (those parameters only go out 72 hrs), especially if the surface high continues to move further out to sea.

 

 

Antecedent conditions in the midlevels are good. We are at the mercy of dynamics no matter which way you slice it. A perfect HP planted in a perfect spot with light rates is still a fail. You have to make an educated guess between hours 72-96 on the ukie but it sure looks like CCB/deform moving right through as the low strengthens on its way up. We have good upper level support too. 

 

Heavy precip will keep the column good except for the lowest levels. But I would expect low to mid 30's tops during the heaviest rates. Euro might be too cold though. We'll know more in 45 minutes. 

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Antecedent conditions in the midlevels are good. We are at the mercy of dynamics no matter which way you slice it. A perfect HP planted in a perfect spot with light rates is still a fail. You have to make an educated guess between hours 72-96 on the ukie but it sure looks like CCB/deform moving right through as the low strengthens on it's way up. We have good upper level support too. 

 

Heavy precip will keep the column good except for the lowest levels. But I would expect low to mid 30's tops during the heaviest rates. Euro might be too cold though.

That would be a rarity.

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That would be a rarity.

 

It would. But dropping temps down through the 30's during broad daylight in the afternoon takes a lot. Dynamically driven for sure. If the euro was too juiced and comes in weaker then expect enthusiasm for a significant hit to wane because the solution will certainly be warmer. 

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Ukie would be a nice track and hit based on 72-96 progression imo. 

 

P1_GZ_D5_PN_072_0000.gif

with this 72 hr. 500mb map, you can be sure that subsequent panels would show a real explosion of precip as well as cooling temps

http://meteocentre.com/models/explorateur.php?mod=ukmet&run=12&stn=QQ500&hh=072&map=na&stn2=TT850&run2=12&mod2=ukmet&hh2=072&comp=1&fixhh=1〈=en&yyyy=latest&mm=latest&dd=latest&mode=latest&stn2_type=prog&date_type=dateo

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It would. But dropping temps down through the 30's during broad daylight in the afternoon takes a lot. Dynamically driven for sure. If the euro was too juiced and comes in weaker then expect enthusiasm for a significant hit to wane because the solution will certainly be warmer. 

Was there much spread on the Euro ensembles with regard to timing? Or do most of them have the low at Norfolk's latitude at 0Z Monday? 

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Was there much spread on the Euro ensembles with regard to timing? Or do most of them have the low at Norfolk's latitude at 0Z Monday? 

 

Very few had precip in here by 0z Sun. But we're still far enough out for a significant shift in timing. With that being said there really isn't much support for what the gfs spit out at 12z. 

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