STORM SUMMARY 1-31-21&2-2-2015
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STORM SUMMARY 1-31-21&2-2-2015
Rain and snow spread into northern Illinois between 6-8pm on 1-31and transitioned over to all snow between 10-11pm. We prepared everyone for a very long duration event which is exactly what happened. For parts of the Chicago area, this ended Up being a 36 hour event and about 30 hours for Rockford. Many areas received more snow from this single long event that what had fallen prior to date. This was the 5th largest snow event ever for Chicago and the 10th overall largest snow for Rockford. The snow began very wet and it gradually transitioned into a drier and less dense snow by late afternoon Sunday and Sunday night. The liquid equivalent at ORD was only .87 which normally would suggest 8-9 inches of snow but the ratios increased to almost 30 to 1 instead of the usual 10-1 by late afternoon Sunday – 2-1. Lake effect snow lingered until almost midmorning
In Chicago on 2-2. Amounts after midnight on 2-2 were under a couple of inches.
As the snow became drier, the pressure gradient tightened up resulting in winds gusting to 40 mph. This resulted in considerable blowing and drifting snow
Causing whiteout conditions. Some cities pulled their plows off the roads
Because of the zero visibilities. Winter storm warnings were replaced by a blizzard warning 10:30am on 2-1 and lasted till midnight. The winds caused
Drifts 3-6 feet. Officially ORD had 19.3 inches, MDW 19.2 Romeoville 15.3.
Snow storm totals:
ORD 19.3 RFD 11.9 ROMEOVILLE 15.3 Lincolnshire 22.0 Oak Lawn 21.5
Elmhurst 20.8 Rogers Park 20,0 Lincolnwood 19.7 Winfield 19.2 MDW 19.2
Downers Grove 19.1 Park Forest 18.7 Schaumburg 18.7 Lake Forest 18.5
Burr Ridge 18.5 Highwood 18.3 Lombard 18.2 Winnetka 18.1 Harvard 18.0
Roselle 18.0 Oak Park 18.0 Elk Grove Vlg 18.0 Hoffman Estates 18.0 Harwood Heights 17.5 Westmont 17.5 Marseilles 17.5 Darien 17.2 Plainfield 16.8
Batavia 16.8 Buffalo Grove 16.7 North Aurora 16.7 Lockport 16.5 St. Charles 16.5
Countryside 16.5 Elburn 16.5 Geneva 16.4 Manhattan 16.0 New Lenox 16.0
Homewood 16.0 DKB 16.0 Riverwoods 15.7 Joliet 15.6 Lake Zurich 15.5
Sugar Grove 15.5 Mundelein 15.4 Carol Stream 15.3 Park Ridge 15.3
Morris 15.2 Montgomery 15.1 Lilly Lake 15.0 Chicago Ridge 15.0 Aurora 15.5
Naperville 14.7 Peotone 14.7 Elgin 14.5 Glen Ellyn 14.5 Bolingbrook 14.5
Palatine 14.1 Waukegan 13.3 Crete 12.3 Yorkville 12.0 Beach Park 15.5
Morton Grove 16.5 Sauk Village 20.0 Westchester 20.0 Woodstock 9.1