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Pre-Christmas Winter Storm Potential


Chicago Storm

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Obviously this is on the extreme end of the spectrum (GHD storm) and the baroclinic zone won't be like this as it looks now but to fully realize the potential we need a storm to eject out and not shear out as it moves off to the northeast so it can continue to intensify and back the 850's to southerly or even backed.

 

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Clipper system to the north plays a big part in preventing a full cutter-type scenario on the 12Z GFS. The Euro shows this system as well and it also prevents a full cut. Its speed will also be critical in determining p-types in the cold sector. Slower/weaker = mostly rain. Faster/stronger = a healthy mix.

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Canadian seemed to have updated 144 but not some panels before that....assuming time stamp is correct.  looks good for Chicago...blows for cmh

 

I don't think that's good for anybody really. Trough is open and the low is screaming to the NE, with no resistance out ahead of it. Thicknesses relatively high too.

 

Not sure I'm buying a wound up monster right now.

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this is a cruel 'hobby'    less than 24 hours ago I was slated for 14" by the king himself

 

**now I know what the MA weenies are always going thru**

You dont sit in a great spot, but certainly not out of it yet. Many times we see the models start out SE, then go NW, NW, NW, then settle back down SE some.

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With the depth of cold air and snow cover established, my guess is that the frontal zones will set up across n/c OH to s/c IL with a widespread freezing rain event likely to develop, mainly snow or ice pellets north of ORD to GRR to FNT, rain fog and 50s in s IN and s/c OH. The storm would most likely end with colder phase changes and a gradual plunge back into deep freeze across the region by 23rd west 24th east. Would expect intervals of mixed precip as well as freezing rain so perhaps not a damaging accumulation in most places but some risk of moderate icing around CMI-LAF-FWA-TOL. The mixed precip zone would extend into southern ON and bring some snow as well, trending to all snow north of about Oak Ridges to K-W to Grand Bend (linking to the previously outlined U.S. zone).

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Just looked.  GFS showing the 0c line across southern WI @ hour 132, so it's looking like a rain event, with precious little backside change over for N IL, by hour 144. 

 

One would be inclined to punt, except for the fact it is still 6 or 7 days out.

 

Edited to Add: At hour 192, and again, at hour 216, there appear to be a couple of clippers that move through S WI, and N IL, and with the 540 line in Central IL by then, the region might be able to squeeze a couple of inches out of those...... Timing and placement, obviously big factors here.  Both systems lean toward .20 QPF. Might be the consolation prize for those of us that get rained on.......

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hard to tell for certain with the 24 hour intervals after 144, but it looks like in the extended ggem panels (between 144 and 168) a second piece might ride up the front.   Of course this requires the weaker solution to pan out in the first place.

 

Yeah, it does. You can see a 156 hour map at this link: http://meteocentre.com/models/models.php?lang=en&map=na&mod=gemglb

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Just looked.  GFS showing the 0c line across southern WI @ hour 132, so it's looking like a rain event, with precious little backside change over for N IL, by hour 144. 

 

One would be inclined to punt, except for the fact it is still 6 or 7 days out.

 

Edited to Add: At hour 192, and again, at hour 216, there appear to be a couple of clippers that move through S WI, and N IL, and with the 540 line in Central IL by then, the region might be able to squeeze a couple of inches out of those...... Timing and placement, obviously big factors here.  Both systems lean toward .20 QPF. Might be the consolation prize for those of us that get rained on.......

 

12 GFS still drops about 4 inches of snow even at MDW for this system....and that is using a 12:1 ratio .... which might be high even if we are looking at that run verbatim

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