By mid-afternoon the warm front associated with a low pressure center developing in western Iowa and eastern Kansas runs east across northern Missouri, central Illinois and Indiana into southern Ohio. An extensive blanket of lowering clouds extends over Iowa, Missouri, Illinois, Wisconsin, Indiana and Lower Michigan.
Rain will spread from west to east across the Chicago area impacting the late-day/early evening commute, and continuing overnight with a few claps of thunder possible. As the low pressure center intensifies and moves northeast, the warm front will pass through the Chicago area this evening – moving into Wisconsin allowing mild temperatures and high dew-point (60-degree) air to flow into northeast Illinois, southeast Wisconsin and northwest Indiana. Commuters should be aware that patches of dense fog could form along and ahead of the frontal boundary combining with the wet slick roads to cause hazardous driving conditions.
The cold front associated with this low pressure system will probably cross the Mississippi River headed east Thursday morning – eventually passing through the Chicago area later Thursday afternoon. Showers and a few thunderstorm downpours could bring storm total rainfall of one to more than two-inches before the cold front moves to our east and rain ends later Thursday.