Severe thunderstorms will develop Wednesday night and spread into the Southeast and Ohio Valley Thursday as conditions become more unstable. These storms will develop as a warm, moist air mass from the Gulf of Mexico collides with cooler, drier air to the north and west. The first storms to reach severe criteria are expected across eastern Oklahoma and northeastern Texas late Wednesday night. Large hail will be the greatest threat from these thunderstorms.

The area of low pressure responsible for this round of severe weather will intensify as it tracks through the Plains Thursday. As a result, the threat of severe weather will spread as far north as Indianapolis and far east as the North Carolina coastline. This means that people in 15 different states will be watching the skies for the possibility of severe thunderstorms. The greatest threat will be along the central Gulf Coast, across Mississippi and Alabama.

Story by AccuWeather.com Meteorologist Eric Wanenchak