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January Storm Term Threat Discussions (Day 3 - Day 7)


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14 minutes ago, psuhoffman said:

The CMC was close to a complete monster had it phased that tpv lobe in a little more....OMG 

Yeah, CMC is getting closer and it was great because we get snow on snow on snow in a week, BUT I still think this system has so much more potential than it showed. It only snows a max of like 12 hours over us. Get it to tilt negative and tuck a bit farther northwest and crawl away and then we are talking.

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2 minutes ago, psuhoffman said:

True...but those factors can often time lead to there being a very heavy banding along the northern fringe as the lift meets the resistance in the flow.  Globals often miss that and its why a lot of times you get a "shift north" at the last minute.  The storm didnt actually shift north the models simply didnt see that feature.  

No doubt there can be some intense banding with the type of explosive non-linear cyclogenesis this setup can produce, just warning in advance of the (likely sharp) cutoff. You're either in it or you're not type deal. One thing to watch in the globals is where the sloped f-gen zone intersects the DGZ or maxima higher in the column that can overwhelm dry layers. Sometimes, in the scenario you reference, a good indicator of misplaced banding can be teased out of looking at cross sections. We're a few days away from being able to talk about that realistically, but something to look for. 

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3 minutes ago, Ralph Wiggum said:

GEFS are different in Canada but still a massive hit with some wiggle room and upside still.

Notice...the GEFS have not shifted that NE wall to the precip running through central NJ at all the last few runs...but are tightening up the precip south of that line.  That is about what I expect in the end.  Somewhere between Philly and NYC is going to be a very very sharp cutoff and south of that gets a good snow and north is smokin cirrus 

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2 minutes ago, csnavywx said:

No doubt there can be some intense banding with the type of explosive non-linear cyclogenesis this setup can produce, just warning in advance of the (likely sharp) cutoff. You're either in it or you're not type deal. One thing to watch in the globals is where the sloped f-gen zone intersects the DGZ or maxima higher in the column that can overwhelm dry layers. Sometimes, in the scenario you reference, a good indicator of misplaced banding can be teased out of looking at cross sections. We're a few days away from being able to talk about that realistically, but something to look for. 

The GEFS might already be seeing that a bit.  The last few runs the very sharp northern edge of the precip has not moved much...running through central NJ and PA...but the precip is increasing south of that line tightening the gradient.  That seems right to me.  

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