Significant lowland flooding possible tonight into Friday

A very, very slow moving low-pressure impulse will move into the Carol Stream area tonight and tomorrow, raising the possibility of widespread flooding in the region. A Flash Flood Watch remains in effect through tomorrow afternoon.

After showers and scattered rain today, the ground remains saturated after nearly 1 3/4″ of rain. A further 3-4″ of rain may be possible overnight tonight, resulting in flooding. The risk of flooding is considerably greater north of the Elgin-O’Hare Expressway and west of Illinois 53, where widespread rain totals of 2-3″ have already occurred. However, tonight’s heavy rainfall threat is likely to be more widespread than today’s heavy rainfall.