Input (grade 11): The 2009 Atlantic hurricane season was a below-average year, unlike the 2009 Pacific hurricane season, which was above average, both due to a moderate El NiÃ o/O. During this year, nine tropical storms formed, the fewest since the 1997 season.
Output (grade 10): The 2009 Atlantic hurricane season was a time period of 2009 when tropical cyclones were likely form in the Atlantic Ocean.