and 2000, there was an average of 2.3 major hurricanes per season. Throughout the season, the U.S. Weather Bureau issued more advisories than in any previous season. Additionally, reconnaissance aircraft were utilized for more flight hours than in any year in the Atlantic basin until that point. The season officially ended on November 30. Hurricane Camille made landfall in Mississippi on August 18 as a Category 5 hurricane, becoming one of only four tropical cyclones to strike the United States as a Category 5, the others being the Labor Day hurricane in 1935, Hurricane Andrew in 1992, and Hurricane Michael in 2018. Project Stormfury conducted seeding experiments on Hurricane Debbie, which declined in wind speed by 31% on the first day and by 18% of the following day. With a duration of almost 25 days from September 20 to October 15, Hurricane Inga is the third longest-lasting tropical cyclone in the Atlantic, behind only the San Ciriaco hurricane of 1899 and Hurricane Ginger in 1971. On November 24, Hurricane Martha became the first tropical cyclone on record to strike Panama. The season was above average despite an El Niño, which typically suppresses tropical cyclogenesis in the Atlantic Ocean while increasing activity in the eastern Pacific Ocean. The Atlantic upper tropospheric shear line, a semi-permanent feature that extended southeastward into the Caribbean Sea, which enhances outflow from disturbances, remained persistent throughout the season. However, the opposite periphery of the shear line inhibits the divergent outflow of a disturbance. This may have increased the number of tropical cyclones developing, while causing other storms to remain weak or dissipate over the deep tropics. Additionally, an abnormally strong mid-tropospheric ridge replaced the southward-displaced westerlies that deterred tropical cyclone formation in 1968. Five hurricanes and two tropical storms made landfall, causing 535 deaths and $1.5 billion in damage; Tropical Depression Twenty-Nine also resulted in damage. Tropical cyclogenesis began early, with a tropical depression that affected Jamaica. Activity briefly went dormant between June 15 and July 25, when the next depression originated. That same day, the season's first named storm, Anna, developed over the eastern Atlantic. There were five tropical cyclones that formed in the month of August – Blanche, Camille, Debbie, Eve, and Francelia. Camille was the most intense tropical cyclone of the season, peaking as a Category 5 hurricane with maximum sustained winds of and a minimum barometric pressure of . September was the