sentences:  Melanie was the first storm of the season to require cyclone watches, and warnings were issued for the Pilbara coast, but it had weakened into a low-pressure area before it made landfall.Tropical Cyclone Helen was the first tropical cyclone to form in 2008, in the Southern Hemisphere, forming in TCWC Darwin's area of responsibility.Helen marked the first time that Darwin had experienced a tropical cyclone since Cyclone Gretel in the 1984–85 season.