The severe weather potential intensifies Thursday, with the Storm Prediction Center highlighting a 15% chance of severe thunderstorms across central Pennsylvania. Dew points in the upper 60s to lower 70s will contribute to high humidity, and a surface cold front approaching from the Ohio Valley could trigger significant thunderstorm activity.

History of every star — including one for the Great Chicago Fire — and stripe Weather records (from the National Weather Service, Chicago) High temperature: 99 degrees (1987) Low temperature: 45 degrees (1997)

It's been a stormy and rainy Saturday morning in Oklahoma, and there are more risks of severe storms during the Father's Day weekend.