Instantly after Erin become a tropical depression, the National Hurricane Center gave out a tropical storm watch from Freeport, Texas to the United States/Mexico border; at the same time, the government of Mexico issued a tropical storm watch southward to Rio San Fernando. Shortly before achieving tropical storm status, the watch in Texas was upgraded to a tropical storm warning. Late on August 15, the warning was extended to San Luis Pass, while the watch in Mexico was cancelled. As Erin made landfall, the warnings was cancelled, and several flood watches and warnings were given out for counties across southeastern Texas. Upon moving into Oklahoma, flood and flash flood warnings were issued for several counties.