[nb 1] The season officially began on June 1 and ended on November 30, dates that conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin.

Forming over the northwestern Gulf of Mexico, Allison produced widespread heavy rainfall along its path (most notably across Texas and Louisiana), killing 41 people and inflicting $9 billion (2001 USD) in damage.

[4] Following the season, Allison became the first tropical storm to have its name retired by the World Meteorological Organization.

[nb 3] The storm's impacts extended from the Caribbean Sea to the Bahamas and were most severe in Cuba, cementing its status as one of the costliest cyclones on record there.

[6] This timeline documents tropical cyclone formations, strengthening, weakening, landfalls, extratropical transitions, and dissipations during the season.