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Frontogenesis/Baroclinic zone induced snows


snowstormcanuck

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Good eye. The boundary is definitely South of where it was earlier this morning.

~11z RAP OBS

attachicon.gif2015020710_metars_dtw.gif

~16z

attachicon.gif2015020715_metars_dtw.gif

 

Question now is to quantify what effects this may have on wave two. Ostensibly, the further south the front can sag, the more likely the baroclinic path for the 2nd s/w sags south a bit too.

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I mean the bands from salvage mode on the radar look a lot better than what I'm seeing outside.

 

It's pretty showery S of a line from Collingwood to Pickering. Looks like Toronto will get its bursts, but also some lulls. For instance, I think another uptick in snowfall rates is about to move in from your NW, but it may only last 10-20 mins.

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Question now is to quantify what effects this may have on wave two. Ostensibly, the further south the front can sag, the more likely the baroclinic path for the 2nd s/w sags south a bit too.

 

Agree. What this morning has shown us is that the heaviest snows will want to sit just N of the boundary. Curious as to your thoughts re the front sagging a little further South.

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Agree. What this morning has shown us is that the heaviest snows will want to sit just N of the boundary. Curious as to your thoughts re the front sagging a little further South.

 

Not really optimistic. Front is already parallel to the upper level flow and once the next s/w ripples along it, the tendency may be for it to shift north slightly. But if the shallow arctic air is strong enough that it can make it ooze south this morning by another 20 miles in between s/ws, that may be enough of a buffer zone to at least make it interesting this afternoon/evening.

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Not really optimistic. Front is already parallel to the upper level flow and once the next s/w ripples along it, the tendency may be for it to shift north slightly. But if the shallow arctic air is strong enough that it can make it ooze south this morning by another 20 miles in between s/ws, that may be enough of a buffer zone to at least make it interesting this afternoon/evening.

It does seem to be parallel to the 850mb flow but at least the 700-300mb flow is veered more to the NW. Should be interesting to see if/where it moves.

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Peter Kimbell, a met from Environment Canada, was just on CP24 and he said that the heaviest snow for Toronto will be tomorrow afternoon with 5-10 cm. He wouldn't be surprised if it's more than 10 cm. For today and tonight, he's expecting lighter snows with a few cms with a possibility of mixing with ice pellets/freezing drizzle (especially tonight and tomorrow morning).

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