In early June, the National Hurricane Center began monitoring an area of disturbed weather in the northwestward Caribbean Sea.
The system moved northward and slowly organized, despite strong wind shear. After a reconnaissance aircraft reported a closed circulation on June 5, the National Hurricane Center initiated advisories on Tropical Storm Andrea at 2200 UTC, while centered about 310 miles (500 km) southwest of Tampa, Florida.
Upon developing into a tropical cyclone on June 5, a tropical storm warning was issued from Boca Grande to the mouth of the Ochlockonee River in Florida. Additionally, a tropical storm watch was put into effect for Flagler Beach, Florida to Surf City, North Carolina. In Gulf Shores, Alabama, 10 swimmers had to be rescued due to strong rip currents on June 5.