Simplify the following text for a Grade 9 native English-speaking person.
Original: Tropical Storm Allison was a tropical cyclone that produced severe flooding in the southern United States . The second tropical cyclone and the first named storm of the 1989 Atlantic hurricane season , Allison formed on June 24 in the northwestern Gulf of Mexico .
Simplified: ( ( Image : Tropical Storm Allison ( 1989 ) .