National Weather Service United States Department of Commerce
It was a windy couple of early December days across the area. Responsible for these winds had been a strong weather system, known as a low pressure, that tracked from the Plains to Lake Superior.  This system deepened and rapidly along its path, with a significant temperature difference ahead and behind it.

Fast Facts:
  • The peak wind gusts observed at area airports were 58 mph at Gary Airport and 56 mph at Rockford Airport and Waukegan Airport.
  • The strongest wind gust at Chicago O'Hare was 49 mph at 12:54 a.m. on early Tuesday morning.  From 2 pm Dec 4 through 5 pm Dec 5, winds gusted to 40+ mph at least once in 21 of those 27 hours!
  • For Rockford, from 8 pm Dec 4 through 4 pm Dec 5, winds gusted to 40+ mph at least once in 16 of those 20 hours.
  • The winds caused isolated minor damage per media reports, such as a gas station canopy in Alsip, IL and some windows blown out in a few locations.
  • Temperatures on Monday were near record highs in the mid 60s, and then fell sharply to around 30° by Tuesday morning, with wind chills in the teens to 20°.
 
Low Pressure Map
Hourly map of mean sea level pressure and temperatures (image) from Dec 4 into Dec 5.

 


 



Peak Winds
    ORD     RFD
Peak Wind Gusts     Chicago (ORD) Observations     Rockford (RFD) Observations

 

Public Information Statement
National Weather Service Chicago IL
534 AM CST Wed Dec 6 2017 /634 AM EST Wed Dec 6 2017/

...Peak Wind Gusts From December 4-5...

Following are a list of the highest wind gusts at area airports
and Lake Michigan marine platforms. The winds did cause isolated
minor damage.

Land Location                Speed     Time/Date       Provider
---------------------------------------------------------------
Gary Airport                 58 MPH    0245 PM 12/05   AWOS
Rockford Airport             56 MPH    1107 PM 12/04   ASOS
Waukegan Airport             56 MPH    0900 PM 12/04   ASOS
Valparaiso Airport           55 MPH    0130 PM 12/05   ASOS
Peru Airport                 54 MPH    1235 AM 12/05   AWOS
Rochelle Airport             54 MPH    1235 AM 12/05   AWOS
Sugar Grove - Aurora Airport 53 MPH    0135 PM 12/05   ASOS
Dupage Airport               53 MPH    1257 PM 12/05   ASOS
Chicago O`Hare               51 MPH    0203 PM 12/05   ASOS
Chicago Midway               51 MPH    0207 PM 12/05   ASOS
De Kalb Airport              51 MPH    0115 PM 12/05   AWOS
Rensselaer Airport           49 MPH    0755 PM 12/04   AWOS
Wheeling - Chi Exec Airport  46 MPH    1215 AM 12/05   ASOS
Romeoville - Lewis Airport   46 MPH    0835 PM 12/04   AWOS
Lansing Airport              46 MPH    1135 PM 12/04   AWOS
Pontiac Airport              46 MPH    0735 PM 12/04   AWOS
Morris Airport               45 MPH    1135 AM 12/05   AWOS
Joliet Airport               44 MPH    1255 AM 12/05   AWOS
Kankakee Airport             44 MPH    0855 PM 12/04   AWOS


Marine Location                Speed     Time/Date     Provider
---------------------------------------------------------------
Chicago Crib                 62 MPH    1140 PM 12/04   MARITIME
Michigan City C-man          60 MPH    0220 PM 12/05   MARITIME
Burns Harbor                 51 MPH    0250 PM 12/05   NWS-GLOS
Calumet Harbor               46 MPH    0842 PM 12/04   NWLON
Waukegan Harbor              45 MPH    0240 AM 12/05   NWS-GLOS

Observations are collected from a variety of sources with varying
equipment and exposures. We thank all volunteer weather observers
for their dedication. Not all data listed are considered official.

$$

MTF