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December 20-22 Winter Storm (Blizzard?) Potential


Hoosier

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So guys, where is this storm supposed to bomb out?

EDIT: Nevermind

In terms of "bomb cyclogenesis" as laid out by Sanders and others (http://goo.gl/JxSQJ) bomb cyclogenesis in the lower 48 generally equates to a 24 hr drop in pressure or more in 24 hrs (it is latitude based). In nearly all leeside cyclone cases in the plains ejecting into the OV, it is extremely rare for a cyclone to undergo such a deepening rate since leeside lows, by their nature, are already deep due to leeside mountain processes, and often they will "weaken" in terms of pressure as the upper wave ejects before undergoing more steady baroclinic deepening through the plains. Even Groundshogs Day, Feb 1 storm did not reach bomb criteria, and that had major latent heat release working on its side.

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It's funny people are ruling themselves out after a few runs 96hrs out when the wave is still out in the pacific

It's a little less than that, although the GEM slowed the system down a bit to make it so. I've seen too many similar December scenarios with lows cutting through Milwaukee or Chicago that I figure it's the most likely scenario this time around.

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Won't be able to pin that down until Tues-Wed when the system is sampled. Most major models bomb the system over Lake Michigan into western and central Michigan.

Actually, the northern wave which forms part of the mean upper low is actually already being partially sampled by the AK upper air and obs network.

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It's a little less than that, although the GEM slowed the system down a bit to make it so. I've seen too many similar December scenarios with lows cutting through Milwaukee or Chicago that I figure it's the most likely scenario this time around.

4 hrs ago you were getting worried about it being suppressed

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Tell that to Turtle, Andy and Daddylonglegs, but I see your point. Those three probably will get the brunt of this, as similarities to Dec. 8-9, 2009 and Dec. 11, 2010 are coming into view it seems.

I like the impacts this is hinting at for those mentioned above, for those of us on the far western edge of this sub forum (ie far eastern MN) not looking for much at this time, lets see what the northern wave will do 24 hrs before impact, weaker and further north, we could see this storm cutting up into Green Bay. Chances of that happening about 1 in 5 imo.

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It's a little less than that, although the GEM slowed the system down a bit to make it so. I've seen too many similar December scenarios with lows cutting through Milwaukee or Chicago that I figure it's the most likely scenario this time around.

Yep, I was thinking the same thing. Winter for us seems to be two months long anymore...January and February. I should just expect rain from this. So sick of storms dissing SW Michigan...

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Thanks Baro...that's the whole key as to how far this system can move to the nw.

Personally I would love to see the NAM verify (will be home in MN tomorrow for Christmas), but northern stream interference always worries me, plus the NAM is never worth putting stock in when the upper baroclinic wave is on the edge of the boundary (I have learned that even more forecasting out here in AK where the NAM is completely and utterly worthless near the edges of its boundary).

Only hope for a NW push/stronger cyclone would be the perfect combination of a perfectly ejecting PV anomaly to incite rapid development leeside...and a slower ejection which would help limit northern stream influence.

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