UPDATED: Winter Storm Warning in Effect Until 10AM Friday
Heavy snow and intense winds will mean very poor visibility on the roads.
The National Weather Service forecast predicts rain and thunderstorms for the Darien area Thursday afternoon.
"A chance of rain and thunderstorms, then rain and possibly a thunderstorm after 4pm. Temperature falling to around 36 by 5pm," the forecast states.
Locally, the NWS is based in Romeoville.
A second forecast, from the Northern Illinois Storm Chaser Forecasting Facebook page predicts thundersnow.
"Intense thundersnow will boost rates and totals over the area," the status states. "Chicago metro could get 3 inches south to 6 north all being blown around by 60 mph winds."
The page says the event will be short in duration.
A winter storm warning will be in effect until 10 a.m. Friday, the National Weather Service is reporting.
Rain will change to snow from west to east late Thursday afternoon, with some heavy snow. The heaviest snow and lowest visibility should be between 5 and 9 p.m. in the area.
According to NWS, two to six inches of snow are likely, with the highest amounts across the far north and northwest suburbs.
Winds will be up to 30-40 mph with gusts as high as 60 mph.
"The combination of the intense snowfall and very strong winds will result in greatly reduced visibilities and possibly near blizzard conditions.
Patch will update this story as conditions change.