Piper City Fire Department issued the following announcement on Jan. 23.
Special Weather Statement issued January 23 at 5:45AM CST by NWS Chicago IL
Areas Affected: Lake; Newton; Kankakee; Benton; Porter; Iroquois; Ford; Jasper
Temperatures have risen into the mid and upper 30s across east
central Illinois and northwest Indiana, however, icy conditions
remain a possibility in some locations this morning. In
particularly, secondary or lesser used roads as well as bridges or
elevated surfaces. Those traveling this morning should use caution
and expect slippery conditions.
Original source can be found here.