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Obs and nowcast Major Nor'easter near blizzard Sunday afternoon Jan 31 - Sunrise Wednesday Feb 3


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Just now, jm1220 said:

The lousy 700 low track is always a red flag to me for a fast dryslot. We should easily make it to 12” but the 15+ amounts aren’t happening east of the city unless radar really regenerates. 

interesting anatomy of these storms, would this kind of thing not happen if the storm was vertically stacked?  also, are there ever cases where these "assistant lows" (the 700 low for example) are to the southeast of the main low?

 

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Just now, janetjanet998 said:

according to CC so far ,  any sleet changes back to snow a couple of miles south of you

sounds like it's based on precip rates so between bands it sleets and in the bands its snow.

by the way sleet is still considered snow in measurements so if sleet is accumulating it's still considered an accumulating snowfall lol.

 

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Just now, LibertyBell said:

interesting anatomy of these storms, would this kind of thing not happen if the storm was vertically stacked?  also, are there ever cases where these "assistant lows" (the 700 low for example) are to the southeast of the main low?

 

The low eventually becomes vertically stacked but lows here would have the 700 low track to the west of the surface low and the 500 low west of that. That’s how the storm strengthens-it’s vertically tilted and air can rise quickly. When it becomes stacked all the lows are on top of each other and it starts weakening since the fast rising air stops. You really would rather the 700mb low go east of you for the best pivot point on the snow. East of it is where the dry air comes in. 

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Just now, jm1220 said:

The low eventually becomes vertically stacked but lows here would have the 700 low track to the west of the surface low and the 500 low west of that. That’s how the storm strengthens-it’s vertically tilted and air can rise quickly. When it becomes stacked all the lows are on top of each other and it starts weakening since the fast rising air stops. You really would rather the 700mb low go east of you for the best pivot point on the snow. East of it is where the dry air comes in. 

Thanks- but if the 700mb low is east of you wouldn't that mean that the surface low is too far to the east?  Or is it a case of you want the 700mb low to be only a little to the west of the surface low?  And so if the 700 and 500 lows were to the east of the surface low, that would be bad since the storm would be weakening?

Vertically stacked lows sound a lot like an occlusion.

 

 

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