The National Weather Service in Chicago has issued a * Severe Thunderstorm Warning for... East central Will County in northeastern Illinois... Newton County in northwestern Indiana... Porter County in northwestern Indiana... Lake County in northwestern Indiana... Jasper County in northwestern Indiana... * Until 615 PM CDT. * At 521 PM CDT, severe thunderstorms were located along a line extending from near St. Anne to near Hopkins Park to near Sheldon, moving northeast at 55 mph. HAZARD...70 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect considerable tree damage. Damage is likely to mobile homes, roofs, and outbuildings. * Locations impacted include... Gary, Portage, Merrillville, Valparaiso, Schererville, Hobart, Crown Point, Chesterton, Cedar Lake, Lowell, Rensselaer, DeMotte, Hebron, Kentland, Remington, Morocco, Wheatfield, Lake Village, Griffith and St. John. Including the following interstates... Indiana I-80 between mile markers 11 and 16. Indiana I-90 between mile markers 19 and 37. Indiana I-94 between mile markers 16 and 32. Indiana I-65 between mile markers 200 and 260. This includes... Valparaiso University, Illiana Motor Speedway, Indiana Dunes State Park, Lake County Fairgrounds, Porter County Fairgrounds, and US 41 Dragway.