Chicago area under severe thunderstorm watch on Tuesday

Severe thunderstorms moved into the Chicago area on Tuesday morning. 

Some areas were seeing strong to severe storms as of around 9:30 a.m. The main threats will be large hail and damaging wind gusts, especially late afternoon into the evening as the front passes through.

A ground stop was issued at O'Hare Airport until 9:45 a.m. due to thunderstorms.

A severe thunderstorm warning is in effect for southeastern Cook County, Kankakee and Will counties until 10:30 a.m. The severe warning is also in effect for Lake County, Indiana, until 10:45 a.m. 

 A severe thunderstorm watch is in effect through 5 p.m. for La Salle, Kankakee, Kane, Grundy, Will, Cook, DuPage and Kendall counties in Illinois. The Indiana counties under the watch include Lake, Porter, Jasonper, La Porte and Newton. 

Golfball-sized hail was spotted in Joliet around 9:30 a.m.  

There is a low tornado risk.  

Conditions will be warm and humid with highs in the upper 70s and 80s before a cold front moves into the area.   

Showers and storms will gradually move south Tuesday night as a front clears the region, bringing a noticeable cooldown into the 30s and 40s by Wednesday morning.