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January 22-27th Clippers/Hybrids


Chicago Storm

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There's other models besides the NAM, and it's just coming more in line with the average model output of .15-.20 for us.  We should manage better than 10:1 ratios tomorrow/Saturday and maybe Sunday although that gets more tricky with the rapid WAA aloft.  Chad's upper range may be optimistic but I really don't see how we come out of this period with less than 3"

 

I'm seeing a fairly good weakening trend on impulse #1...so that's where I see our 1-2". Ratios be damned, because they rarely work out. The Sunday deal is going way north a la the Euro, GGEM, Ukie and now NAM. We'll be lucky to see much of anything with that one before WAA shoots us way above freezing for a time.  And as usual, WAA is severely underestimated by the models.

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I'm seeing a fairly good weakening trend on impulse #1...so that's where I see our 1-2". Ratios be damned, because they rarely work out. The Sunday deal is going way north a la the Euro, GGEM, Ukie and now NAM. We'll be lucky to see much of anything with that one before WAA shoots us way above freezing for a time.  And as usual, WAA is severely underestimated by the models.

 

 

The WAA is our friend in this setup...it's what will give us a burst of snow.  Hopefully it doesn't get out of control.  I like the cold airmass at onset...we are not talking about starting at 28 and getting blasted with warm air.  We start the day in the single digits or teens.

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Pretty impressive winds behind the cold front Sunday afternoon.  NAM showing a few pockets of 30kts sustained winds over northern IL. 

 

NAM_221_2014012400_F72_WSPD_10_M_ABOVE_G

 

 

 

NAM is standing on the rooftop and screaming high wind event.  It shows some areas mixing to near 700 mb and 50-60 kt winds in the mixed layer. 

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Near Chicago at 72 hours.  Very strong wind potential if this is right.

 

 

attachicon.gifUntitled.png

 

Wow.  It is the NAM, but interesting that it's indicating this. 

 

I think either way you slice it, the progression of things on Sunday is looking very interesting.  Strong post-frontal winds with an insane temp crash in a 6-12hr period is interesting enough.  Any snow that falls before that is sort of a bonus to this big time event.

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Wow.  It is the NAM, but interesting that it's indicating this. 

 

I think either way you slice it, the progression of things on Sunday is looking very interesting.  Strong post-frontal winds with an insane temp crash in a 6-12hr period is interesting enough.  Any snow that falls before that is sort of a bonus to this big time event.

 

 

The fact that it's a CAA event kinda has me concerned about wind potential, especially if the stronger solutions verify.  Some of the NAM soundings are a little freakish for a period...

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The fact that it's a CAA event kinda has me concerned about wind potential, especially if the stronger solutions verify.  Some of the NAM soundings are a little freakish for a period...

 

 

Like this...LAF/OKK area.  Promise this is my last NAM forecast sounding for now.  :)

 

 

post-14-0-65397400-1390538705_thumb.png

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Thanks, beavis for the Chicago January numbers.

 

Factoring in today's values, currently sitting near 16.5F mean temp, which represents 17th coldest in 142 years (1873-2014) and projected to drop further to end up possibly 8th between 1918 and 1963 (13.3, tied 6th) and 1985 (14.4, now 8th). Only 1977 (10.2), 1912 (11.9), 1893 (12.1), 1982 (12.2) and 1979 (12.4) were colder than all of the above.

 

To break 13.3 after today's known values would require close to a zero F mean 24th to 31st while the projections are closer to 5 F which leaves the month at about 14.0, 0.4 colder than 1985 which may or may not be safe, and 0.9 colder than 1888 (currently 9th and in need of midnight highs and such to escape dropping to 10th). Almost certain to be passed are 1978, 1994 and 2009 all tied for 10th (15.9), 1875 at 13th now (16.1), 1887 and 1940 tied for 14th (16.3), and soon to feel our wrath 1883 (16th at 16.4).

 

If there were records from 1841 to 1872 as with Toronto, only 1856 and 1857 appear likely to get onto this list for certain, 1872 possibly. Would imagine 1857 would then hold first place but 2014 could pass the other two. That would then make it eventually somewhere around 9th or 10th coldest in 174 tries.

 

Will update as we pass various benchmarks. Cross-posted to the cold weather thread.

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