In 2007, in which region was this tropical cyclone affecting Oklahoma and Texas formed?
2007 Midwest flooding:  While Hurricane Dean was affecting the Yucatán Peninsula and the Gulf of Mexico, and Tropical Storm Erin was affecting Oklahoma and Texas, a persistent storm system hung over the Midwest for several days, causing repeated flash flooding in the US states of Illinois, Indiana, Iowa, Minnesota, Ohio, and Wisconsin. Tropical Storm Erin (2007):  The fifth named storm of the season, it formed in the Gulf of Mexico on August 14 from a persistent area of convection.
the Gulf of Mexico