National Weather Service officials are expecting Wednesday waves of showers and thunderstorms to hit the Chicago area capable of producing damaging winds and large hail and possibly tornadoes.

Hurricane-force winds were also reported in parts of the area. Wind gusts topped out at 81 mph in Valparaiso, Indiana, 75 mph in Lakes of the Four Seasons in Indiana, and 74 mph in Gary, Indiana, and Lynwood, Illinois.

The Chicago area could soon see the threat of strong-to-severe thunderstorms, as several watches and warnings have been issued this afternoon.

A semi driver was killed in Valparaiso as strong winds moved through the area, knocking out power for thousands, officials said. The storms uprooted trees, downed power lines, and damaged several homes,

Weather balloon releases — tracking temperature, pressure and wind speed — have been suspended or reduced in the Midwest and Great Plains.

A tornado warning was issued in northwest Indiana and most Chicago-area counties saw severe thunderstorm warnings on an eventful Sunday afternoon.

The National Weather Service says strong to severe weather will impact the Chicago area from 1 p.m. to 7 p.m. on Wednesday, but the threat has diminished for some parts of northern Illinois. A flood advisory is in effect for the southern half of Cook County, and most of Will County and Lake County, Indiana, until 4:45 p.m.

Hail and massive wind gusts pelted the Chicago area as severe thunderstorms rumbled through Sunday afternoon. The system had prompted a tornado watch covering most of northeastern Illinois and northwest Indiana, but the National Weather Service canceled it by 3:15 p.m. with storms rolling out over Lake Michigan.

Several states in the central U.S. were hit hard overnight by a deadly storm that reportedly caused flash flooding and even destructive tornadoes.