 On July 30, the system's circulation began to organize and the first reports of tropical storm-force squalls were reported as it moved closer to the Texas coast.Based on this the National Hurricane Center (NHC) issued tropical storm warnings for much of the Texas and Louisiana coast, from Intracoastal City, Louisiana to Corpus Christi, Texas.Later that afternoon it strengthened into Tropical Storm Dean while located just 70 mi (110 km) off the coast.