As cold front approaches from the west, strong warm southerly flow in advance of the front has pushed record-high temperatures into the Chicago area and northeast Illinois

 The east-moving north-south–oriented cold front was crossing the Mississippi River at 4PM CST this afternoon. Ahead of the front strong southerly winds gusting over 30 miles per hour were bringing 70-degree temperatures into northern Illinois. Midway recorded high of 72 degrees an all-time December high temperature for that location. Chicago’s official observing site on O’Hare Airport recorded a high of 70 degrees just one degree shy of the Chicago’s record December high of 71 set back on December 3rd 1970 and tied December 2nd, 1982. Many other metro-area locations hit the 70-degree mark this afternoon.

At 4PM CST A line of showers and thunderstorms was developing ahead of the front – extending from central Wisconsin into northwest Illinois – the southern portion of the line of showers was just west of Rockford moving in on Freeport. Showers and thunderstorms will spread east across the Chicago area this evening as the cold front begins it’s push through the area. 

Some 3PM CST weather observations: 

NORTHWEST ILLINOIS 

CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS

MOLINE         CLOUDY    69  58  67 S8        29.73S

STERLING*      CLOUDY    70  59  68 SW6       29.75R

SAVANNA*       CLOUDY    64  57  77 S9        29.73S 

 

NORTH CENTRAL ILLINOIS 

CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS

ROCKFORD       CLOUDY    68  60  75 S10       29.76S

FREEPORT*      CLOUDY    67  60  79 S15       29.75S

ROCHELLE*      CLOUDY    68  58  70 S28       29.76S

DE KALB*       CLOUDY    68  62  80 S24       29.78R

PERU*          CLOUDY    69  58  68 SW28      29.78R 

 

NORTHEAST ILLINOIS 

CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS

CHICAGO-OHARE  PTSUNNY   70  60  70 S24G31    29.76F

CHICAGO-MIDWAY PTSUNNY   71  58  63 S21G31    29.79F

AURORA         PTSUNNY   68  59  73 S22G32    29.76F

LANSING*       MOSUNNY   70  58  66 S21G30    29.81F

JOLIET*        SUNNY     70  58  66 S13G22    29.78F

WAUKEGAN       MOSUNNY   60  57  89 SE9       29.74F FOG

DUPAGE AIRPORT PTSUNNY   68  59  73 S23G33    29.76F

KANKAKEE*      MOSUNNY   71  58  64 S21G26    29.84F

WHEELING       MOSUNNY   69  60  73 S21G30    29.77F

MORRIS*        SUNNY     71  59  64 S16G25    29.78F

ROMEOVILLE*    MOSUNNY   70  59  68 S20G26    29.78F

NORTHERLY ISL    N/A     70  59  68 S17         N/A

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