![]() ![]() Libertyville 10.5 in 0900 PM 01/31 Trained Spotterġ WNW Woodridge 10.5 in 0415 PM 01/31 NWS Employee Joliet 10.7 in 0500 PM 01/31 Trained Spotterīolingbrook 3 NE 10.5 in 0700 AM 02/01 COCORAHS Ohare Airport 10.8 in 1200 AM 02/01 Official NWS Obsġ SW Medinah 10.8 in 0800 PM 01/31 Cocorahs Glen Ellyn 1 SW 10.8 in 0800 AM 02/01 COCORAHS Lansing 11.0 in 1200 AM 02/01 CO-OP Observer Glen Ellyn 1 W 11.0 in 0700 AM 02/01 COCORAHS Lockport 2 SE 11.0 in 0700 AM 02/01 COCORAHS Riverwoods 1 NE 11.2 in 0700 AM 02/01 COCORAHS Mokena 11.4 in 1200 AM 02/01 Trained Spotterġ NNW Lindenhurst 11.4 in 0930 PM 01/31 Cocorahsġ NNW Roselle 11.4 in 0600 PM 01/31 Cocorahs Lindenhurst 1 NNW 11.4 in 0700 AM 02/01 COCORAHS Roselle 1 NNW 11.4 in 0700 AM 02/01 COCORAHS Homer Glen 1 NNE 11.5 in 0600 AM 02/01 COCORAHSįlossmoor 11.5 in 0709 PM 01/31 Trained Spotter Park Forest 1 NNE 11.7 in 0700 AM 02/01 COCORAHSĬhicago - West Ridge 11.5 in 0700 AM 02/01 COCORAHS Morton Grove 12.1 in 0730 PM 01/31 Broadcast Mediaįorest Park 1 ENE 12.0 in 0700 AM 02/01 COCORAHS Peotone 12.7 in 0655 PM 01/31 Trained Spotter Thornton 12.7 in 1100 PM 01/31 Trained Spotter Romeoville - NWS Chicago 12.9 in 0600 AM 02/01 Official NWS Obsĭowners Grove 1 NNW 12.7 in 0659 AM 02/01 COCORAHS Harwood Heights 13.8 in 0700 AM 02/01 COCORAHSĮlmhurst 1 SE 13.5 in 0700 AM 02/01 COCORAHS STORM TOTAL SNOWFALL FROM JANUARY 30-31 2021 SORTED BY MAGNITUDE. To see a listing sorted by location, see here. The below listing is sorted by magnitude. Map of final snowfall totals for the area This was highlighted by Chicago O'Hare being 1/4 to 1/2SM visibility in moderate to heavy snow for five straight hours, which is rare to see such a duration!Ĭhicago O'Hare observations during heaviest snow. Heavy snowfall rates were key in this event, with rates of 1+" per hour for several hours during mid-evening January 30th into the early overnight.Other event snowfall amounts included 12.9" at the NWS Chicago in Romeoville and 11.3" observed 3 miles southwest of Chicago Midway International Airport.The official event snowfall for Rockford was 6.8" observed at Chicago Rockford International Airport.The 16.8" from January 25-31 was the snowiest week in six years, since February 1-7, 2015 (19.9").Second 6+" snow event in a week the last time two in a week of 6+" occurred was early January of 2014.Largest snowfall event total in five years, since November 20-21, 2015 (11.2").The official event snowfall for Chicago was 10.8" observed at Chicago O'Hare International Airport.This resulted in numerous auto accidents or slide-offs, relayed through partners and the public to us in the NWS. Road conditions were widespread hazardous to even dangerous on the night of January 30 into the early morning of January 31.This weather system continued eastward, bringing significant snowfall to portions of the Mid-Atlantic and Northeast on February 1-2. The system also slowed as it moved over the area, resulting in persistent snow including lake enhanced snow on January 31. This heavy snowfall was produced by a potent weather system, that in particular had a significant amount of moisture for heavy snowfall rates. Widespread snowfall of 6" to 13" was observed across northern Illinois and northwest Indiana from the afternoon of January 30 through the early evening of January 31 (a 24-30 hour event). ![]()
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