Thunderstorms packing a threat of large hail could begin arriving by 10:30 p.m. in Northwest Indiana, forecasters said.
The National Weather Service issued a severe thunderstorm watch about 8:30 p.m. for Lake, Porter, LaPorte, Newton and Jasper counties. The watch continued until 3 a.m.
Much of north central Illinois was under a tornado watch Tuesday night, with a few scattered tornado warnings. The storms were expected to continue to develop east-northeastward across Illinois and Indiana, forecasters said.
The tornado threat was expected to decrease east of the tornado watch in Illinois, but the threat of severe weather will continue, the weather service said.
A high wind watch for Lake and Porter counties was set to begin at 7 a.m. Wednesday and continue through 8 p.m.
Southwest winds of at least 50 mph with gusts up to 60 mph are possible, forecasters said.
The high winds could make travel difficult, especially for high-profile vehicles and cause property damage.
Any light-weight outdoor objects should be secured or brought indoors, forecasters said.