UPDATE: Thunderstorm warning has expired.
The National Weather Service has issued a severe thunderstorm warning for Porter County, Indiana until 3:45 p.m. Monday.
A strong line of thunderstorms is heading toward northwest Indiana and will effect Jasper, Lake, Newton and Porter Counties.
These storms could produce wind gusts to 50 mph, hail and heavy downpours.
For the latest weather updates, go to ChicagoWeatherCenter.com