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January 5-6th Winter Storm


Chicago Storm
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Just now, mimillman said:

Yea I don’t know where all of our Indy posters went but 2 years ago this thread would be bonkers 

Both an upper tier snowstorm and ice storm is being suggested, blizzard conditions further west into KS and MO. Pulled some soundings earlier with the warm nose aloft and it was like 25-28 degrees at the surface, would lead to efficient accretion.

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16 minutes ago, andyhb said:

Some of these runs are pretty much historic for the I-70 corridor, for lack of a better term.

I'm curious if a more amped solution like gfs will verify. Aloft it was an impressive system. Low would take off more if confluence was less east. However with neg tilt and closed off 500mb low it still had a nice deformation band. Other models are more neutral tilt and shear it out faster. Someone near STL going to get a big ice storm

 

9 minutes ago, sbnwx85 said:

Creeping north. Might get to advisory level snows if this keeps up. Wish the Euro would join in. 

Would be nice to see euro trend towards gfs

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5 minutes ago, Geoboy645 said:

 

Do not envy the LSX mets at all rn. If the storm goes even just a bit S, STL gets a foot plus of snow for one of the few times ever in it's record. If it goes just a bit N, STL gets a crippling ice storm of potentially an inch of ice with wind. 

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Monster sleet storm is in the table too. 

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4 minutes ago, Geoboy645 said:

 

Do not envy the LSX mets at all rn. If the storm goes even just a bit S, STL gets a foot plus of snow for one of the few times ever in it's record. If it goes just a bit N, STL gets a crippling ice storm of potentially an inch of ice with wind. 

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Heh, luckily they're at the stage for another 12-24 hours where they can keep riding the watch and just say "highly impactful winter weather is likely" and not specify which particular type of highly impactful winter weather is most likely. Though given recent trends and how these things go, probably have to lean a bit more on the icy solution in the LSX area. 

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55 minutes ago, mimillman said:

Yea I don’t know where all of our Indy posters went but 2 years ago this thread would be bonkers 

We’re here. I suppose we’ve just become so accustomed to getting screwed on these big winter events that we ain’t gonna believe anything until we’re literally in our driveways shoveling snow. 

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Trends on the ensembles for our storm to dig a little/come in a bit slower, giving heights ahead of it more opportunity to rise as confluence lifts out to the northeast, certainly do support the notion of the apparent ongoing north trend. 

Euro ensemble trends:

eps_z500a_namer_fh78_trend1-ezgif.com-optimize.thumb.gif.a5d4511f5e6641a3c930bb9d875c1b29.gif

GFS ensemble trends:

gfs-ens_z500a_namer_fh72_trend-ezgif.com-optimize.thumb.gif.baa3cbf193af3768238b82f1382a1f11.gif

With that said, I don't think this thing is going 100s of miles farther north at this point, though the trends at 500mb do give room for last minute northward nudges at the least. 

One item to watch will be the little lobe of the polar vortex extending west towards James Bay. Trends in that could increase or decrease confluence ahead of our storm. More confluence makes a north trend harder (or could shrink the area of snow if the storm itself trends stronger/farther north but runs into a brick wall)...less confluence gives room for likely continued northward nudges. 

While the confluence lifting out could give the storm a bit more room to trend north, the relatively cold airmass in place ahead of the storm and the fact that there still is strong blocking and high pressure ahead of the storm still suggest low level cold will be tough to scour out. This synoptic setup screams a swath of significant sleet and freezing rain. While model freezing rain maps are almost always too aggressive on peak amounts and coverage of significant ice, the somewhat growing model signal for a wide swath of heavy freezing rain is likely foreboding of a swath of nasty ice somewhere given the synoptic setup. 

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Euro is a major ice storm from KS into the Ohio Valley. Moderate-strong winds, moderate precip rates, a deep warm layer aloft, and temperatures significantly colder than freezing at the surface are trouble.

It looks to me like moisture for the cold conveyor belt gets robbed by convection in the Southeast, which would lead me to believe that the GFS is probably overdone on QPF further east.

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