For a long time, I thought the phrase “a perfect storm” came from Sebastian Junger’s book by the same name, which became a very successful movie in 2000. But I did a bit of fact-checking and discovered that the term is 300 years old.
Obviously storms, especially severe ones, fit nobody’s definition of perfect. The phrase “a perfect storm” compares to the familiar expression “a perfect stranger”. Perfect here means absolute or complete, not excellent.