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February 4-5th Winter Storm


Chicago Storm

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:facepalm: 6z gfs.    Just looking at the individual ens members I only counted 2 that were more amped than the OP, all the rest were southeast, a few significantly so.....but who the hell knows at this point.   GFS has yet to have two consistent runs in a row.    Meanwhile euro ens, including 00z, have been steadfast with a low to WV.  Of course the way this winter has been, if the FIM was the only model showing a Chicago to Detroit hit, it woulld score the coupe.  :snorkle:

post-622-0-01369400-1391087668_thumb.jpg

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So I guess we're wagons NW again. 00z models from 1/29/14 definitely ingested some bad data.

 

FWIW (not an awful lot), the 06z DGEX has mixing issues here with the low tracking just SE of Detroit. Very narrow corridor of heavy snow though (along a LAF-TOL-DTW line NW to along a FNT-SBN-STL line), as majority of the precipitation is in the warm sector

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without going out too far in the future...i'm just not seeing any major players to prevent heights in the east front rising even further.

 

gfs_namer_102_500_vort_ht.gif

 

I agree with you on that map verbatim .  Things that could help beat down heights,  the sw lobe of the vortex modeling stronger and further sw, stronger confluence, and a quicker northern stream.   But yea, if the above map verifies....that's game over for anyone southeast of a line from CLE...to Indy...I would imagine the slp would even be stronger.   Confluence should keep it from going too far crazy north.

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without going out too far in the future...i'm just not seeing any major players to prevent heights in the east front rising even further.

gfs_namer_102_500_vort_ht.gif

A few things stick out on that map and are as follows;

1) Weak SE ridge anomaly. We can see the plume of warmth driving from the Gulf thru the SE. Argues for a suppressed track.

2) Plenty of cold air across Canada. Part of the PV situated across Hudson Bay with widespread cold anomalies thru out the region.

3) Two waves of energy at play. Timing is key in determining the strength and track of the LP.

Still ways out but these factors stick out amongst all the models.

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A few things stick out on that map and are as follows;

1) Weak SE ridge anomaly. We can see the plume of warmth driving from the Gulf thru the SE. Argues for a suppressed track.

2) Plenty of cold air across Canada. Part of the PV situated across Hudson Bay with widespread cold anomalies thru out the region.

3) Two waves of energy at play. Timing is key in determining the strength and track of the LP.

Still ways out but these factors stick out amongst all the models.

 

the southeast ridge eventually pops but it's in response to the digging shortwave, not the other way around.   I guess the other question is what is causing the gfs to go neg so fast....is it the phasing in of the northern branch?   If so, like you said...timing timing timing

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the southeast ridge eventually pops but it's in response to the digging shortwave, not the other way around. I guess the other question is what is causing the gfs to go neg so fast....is it the phasing in of the northern branch? If so, like you said...timing timing timing

The SE ridge is always there; however, its weak and thus its effects are negated. Once the S/W begins digging, it sort of pops out of hiding like you said, and drives a plume of warmth out ahead of it. Models this far out tend to be too progressive or slow. These types of situations arent correctly modeled this far out and you end up getting a wide variety of solutions, lol.

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nothing groundbreaking from the 12z GFS but 500mb heights a bit higher in the east compared to 6z

EDIT: trying to look for changes somewhat earlier in the run before looking too far down the pipe. Also looks

a bit stronger at 850 at this point as well, a little backing as well over the plains.

 

6z

gfs_namer_108_500_vort_ht.gif

 

12z

gfs_namer_102_500_vort_ht.gif

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