See more of the story Humidity from the Gulf of Mexico and hot air from the Desert Southwest will combine to produce very steamy conditions through the South Central states Tuesday. From central Texas to the Mississippi Valley, the heat index will reach 105 degrees or higher Tuesday afternoon.

The heat and humidity will cause thunderstorms to boil up through southeastern Texas. These can cause brief downpours, but destructive winds and tornadoes are not likely to occur.

Across the Southeast, Tuesday will be very warm with highs in the upper 80s and lower 90s, but the humidity will stay away.

Story by AccuWeather.com Senior Meteorologist John Kocet.