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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