Final answer:
The situational irony is found in the contrast between the jubilation of Haitians celebrating Duvalier's departure in a New York blizzard and the author's own subdued return to Haiti with an American passport, symbolizing the country's complicated history with the U.S.
Step-by-step explanation:
The situational irony in the author’s account pertains to the celebration of Jean-Claude Duvalier’s departure from Haiti, juxtaposed with the personal story of the author who returns to Haiti for a visit.
The irony lies in the contrast between the jubilation of Haitians in New York, despite the adverse conditions of a blizzard, and the author's more subdued personal journey, marked by the fact that they return on an American passport, an emblem of the complex relationship between Haiti and the United States.
This passport signifies that the author is returning to a nation that has seen multiple invasions and occupations by the U.S., a history that somewhat taints the notion of a triumphant return.