Rain has turned to all snow at about 2:30 p.m. in Arlington Heights as the air temperature has dropped from 39.0°F at 12:52 p.m. to 34°F at 2:52 p.m. at Chicago Executive Airport. Snow is accumulating on grass and pavement surfaces. Minor car crashes have already increased ahead of rush hour, and Rolling Meadows Police Department already switched to the Emergency Accident Plan, which requests crash victims with drivable vehicles and no injuries report crashes at the police station.
Snowfall is occurring ahead of the forecast for the expected rain change to snow. We could be in the wort-case scenario for snowfall. The deepest snowfall is directly on the northwest suburbs of northwest Cook County and the northern third of Cook County; and including the northern two-thirds of Kane County, the southern half of McHenry County and more than three-fourths of southern Lake County. Thundersnow is still possible with embedded thunderstorm during snowfall.
A Winter Storm Warning could still be activated later today or this evening. The area of heaviest snow could still shift south toward Interstate 88. The timing of freezing temperatures and heavy precipitation is still a factor. One thing is certain: The snow will be heavy and wet “Heart Attack Snow.”
Conditions at Chicago Executive Airport
Lat: 42.11 Lon: -87.9 Elev: 646
Last Update on Feb 23, 2:52 pm CST
Light Snow Fog/Mist
Humidity: 92 %
Wind Speed: NE 3 MPH
Barometer: 29.53″ (1000.5 mb)
Dewpoint: 32 °F (0 °C)
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