Timeline of the 2009 Atlantic hurricane season

The 2009 Atlantic hurricane season was a below-average year in which nine tropical storms formed, the fewest since 1997. Although Tropical Depression One formed on May 28, 2009, the season officially began on June 1 and ended on November 30. The season's last storm, Hurricane Ida, dissipated on November 11.

The season had eleven tropical depressions, of which nine intensified into tropical storms, three became hurricanes, and two became major hurricanes. The inactivity throughout the basin was linked to the formation of an El Niño, which increased wind shear. The two most significant storms of the season, in terms of loss of life and damage, were Hurricanes Bill and Ida. Hurricane Bill was an unusually large storm and was also the season's strongest, attaining winds of 135 mph (215 km/h). Tropical Storm Claudette was the only storm during 2009 to make landfall in the United States; Hurricane Ida became extratropical shortly before coming ashore in Alabama.

This timeline includes information that was not operationally released, meaning that information from post-storm reviews by the National Hurricane Center, such as a storm that was not operationally warned upon, has been included. This timeline documents tropical cyclone formations, strengthening, weakening, landfalls, extratropical transitions, and dissipations during the season.

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