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January 21st Snowstorm Obs


Baroclinic Zone

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I may steal this analogy for my blog lol. Perfect.

Kevin things his sugar is going to pile up at 25:1.

I always like to use that one when explaining it.

I'll add that...unlike tree branches snow crystals are delicate ice crystals so those picture perfect dendrites have their crystal structure break down with time. The big culprits are wind and the weight of new snow on top of itself. That's why BUF can get an 80" LES storm and only achieve a 40" max snow depth.

If you topped 2" of fluff with 50% of Pete's hair you'd get compression city. Top it with 50% of Kevin's hair and your fluff is safe.

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As Will noted, snow growth is not great....kind of harkens back to Dec 13, 2007....in the sense that makes up for it some by coming down at a pretty good rate.

Just eyeballing, looks like about .5" down.

15.6\10

12/16/07? (the Thursday event)

Wrong event....that one had great snowgrowth and took place on Sunday.

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7.1 was the offical ORD total

Officially the snowfall for ORD yesterday is still missing. However, on the last PNS issued by KLOT ORD is listed as 5.4 inches for a storm total:

NWUS53 KLOT 210502
LSRLOT

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1102 PM CST FRI JAN 20 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
           ..REMARKS..

0803 PM     SNOW             OAK BROOK               41.84N 87.95W 
01/20/2012  M5.7 INCH        DUPAGE             IL   CO-OP OBSERVER  

           STORM TOTAL.

0805 PM     SNOW             PEOTONE                 41.33N 87.80W 
01/20/2012  M7.2 INCH        WILL               IL   TRAINED SPOTTER 

           STORM TOTAL SO FAR. CURRENTLY LIGHT SNOW. WATER 
           EQUIVALENT 0.49 INCHES.

0815 PM     SNOW             1 NE NORTH AURORA       41.81N 88.32W 
01/20/2012  M5.5 INCH        KANE               IL   COCORAHS        

           STORM TOTAL.

0815 PM     SNOW             1 NW NAPERVILLE         41.77N 88.17W 
01/20/2012  M6.5 INCH        DUPAGE             IL   COCORAHS        

           STORM TOTAL.

0820 PM     SNOW             JOLIET                  41.53N 88.12W 
01/20/2012  M9.1 INCH        WILL               IL   TRAINED SPOTTER 

           STORM TOTAL. 

0822 PM     SNOW             CHICAGO                 41.88N 87.63W 
01/20/2012  M6.2 INCH        COOK               IL   TRAINED SPOTTER 

           STORM TOTAL ON THE WEST SIDE OF CHICAGO. 

0822 PM     SNOW             PORTAGE                 41.59N 87.18W 
01/20/2012  M8.2 INCH        PORTER             IN   TRAINED SPOTTER 

           STORM TOTAL SO FAR. STILL SNOWING LIGHTLY. AREA ROADS ARE
           VERY HAZARDOUS. 

0825 PM     SNOW             2 NNE LAKES OF THE FOUR 41.44N 87.21W 
01/20/2012  M7.7 INCH        PORTER             IN   COCORAHS        

           STORM TOTAL SO FAR. SNOW HAS TAPERED TO LIGHT SNOW. 

0827 PM     SNOW             NAPERVILLE              41.76N 88.15W 
01/20/2012  M7.2 INCH        DUPAGE             IL   TRAINED SPOTTER 

           STORM TOTAL. VERY LIGHT SNOW FALLING. 

0827 PM     SNOW             2 NW JOLIET             41.55N 88.15W 
01/20/2012  M8.0 INCH        WILL               IL   NWS EMPLOYEE    

           STORM TOTAL MEASURED BY RETIRED NWS EMPLOYEE. 

0830 PM     SNOW             ROLLING MEADOWS         42.08N 88.03W 
01/20/2012  M7.0 INCH        COOK               IL   PUBLIC          

           STORM TOTAL. 

0833 PM     SNOW             1 N BARTLETT            41.99N 88.21W 
01/20/2012  M5.0 INCH        COOK               IL   PUBLIC          

           STORM TOTAL. 

0837 PM     SNOW             3 NW KANKAKEE           41.15N 87.90W 
01/20/2012  M5.6 INCH        KANKAKEE           IL   TRAINED SPOTTER 

           STORM TOTAL. VERY LIGHT SNOW AT TIME OF REPORT. SOME 
           BLOWING AND DRIFTING IN OPEN AREAS. 

0840 PM     SNOW             JOLIET                  41.53N 88.12W 
01/20/2012  M9.1 INCH        WILL               IL   PUBLIC          

           STORM TOTAL. 

0840 PM     SNOW             4 NW COAL CITY          41.33N 88.33W 
01/20/2012  M5.8 INCH        GRUNDY             IL   NWS EMPLOYEE    

           STORM TOTAL. 

0840 PM     SNOW             HIGHLAND                41.55N 87.46W 
01/20/2012  M5.3 INCH        LAKE               IN   PUBLIC          

           STORM TOTAL SO FAR. STILL SNOWING. 

0840 PM     SNOW             STREAMWOOD              42.02N 88.17W 
01/20/2012  M5.2 INCH        COOK               IL   TRAINED SPOTTER 

           STORM TOTAL. 

0840 PM     SNOW             SSE BOURBONNAIS         41.16N 87.88W 
01/20/2012  M5.5 INCH        KANKAKEE           IL   COCORAHS        

           STORM TOTAL SO FAR. SNOW HAS END.

0841 PM     SNOW             FORRESTON               42.13N 89.58W 
01/20/2012  M6.0 INCH        OGLE               IL   PUBLIC          

           STORM TOTAL. RELAYED BY WTVO. 

0843 PM     SNOW             ROCKFORD                42.27N 89.06W 
01/20/2012  M4.2 INCH        WINNEBAGO          IL   COCORAHS        

           STORM TOTAL. 

0845 PM     SNOW             BEECHER                 41.35N 87.61W 
01/20/2012  M8.0 INCH        WILL               IL   PUBLIC          

           STORM TOTAL. 

0845 PM     SNOW             MORTON GROVE            42.04N 87.79W 
01/20/2012  M5.6 INCH        COOK               IL   TRAINED SPOTTER 

           STORM TOTAL. 

0845 PM     SNOW             PEOTONE                 41.33N 87.80W 
01/20/2012  M7.3 INCH        WILL               IL   PUBLIC          

           STORM TOTAL. 

0846 PM     SNOW             WORTH                   41.69N 87.79W 
01/20/2012  M7.0 INCH        COOK               IL   TRAINED SPOTTER 

           STORM TOTAL. SNOW TAPERING OFF AND VISIBILITY IMPROVING. 


0850 PM     SNOW             ARLINGTON HEIGHTS       42.09N 87.98W 
01/20/2012  M6.5 INCH        COOK               IL   PUBLIC          

           STORM TOTAL. LIQUID EQUIVALENT 0.59 INCHES. 

0900 PM     SNOW             VALPARAISO              41.48N 87.05W 
01/20/2012  M6.0 INCH        PORTER             IN   PUBLIC          

           STORM TOTAL. 

0900 PM     SNOW             1 N HUNTLEY             42.18N 88.42W 
01/20/2012  M7.8 INCH        MCHENRY            IL   COCORAHS        

           STORM TOTAL.

0900 PM     SNOW             ROMEOVILLE              41.65N 88.09W 
01/20/2012  M6.6 INCH        WILL               IL   OFFICIAL NWS OBS

           STORM TOTAL AT NWS CHICAGO. 

0900 PM     SNOW             1 SSW GENEVA            41.87N 88.32W 
01/20/2012  M5.8 INCH        KANE               IL   COCORAHS        

           STORM TOTAL.

0900 PM     SNOW             ROCKFORD AIRPORT        42.20N 89.10W 
01/20/2012  M5.1 INCH        WINNEBAGO          IL   OFFICIAL NWS OBS

           STORM TOTAL. 

0900 PM     SNOW             OHARE AIRPORT           41.98N 87.90W 
01/20/2012  M5.4 INCH        COOK               IL   OFFICIAL NWS OBS

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