The term is an overused cliché, and as a writer I avoid clichés whenever possible. But though rare, perfect storms do exist. The most common example is the devastating 1991 storm popularized by the book and movie of the same name, although it was initially known as the "Halloween storm."
In that case, three separate weather dynamics all converged in one place on one day to produce a perfect storm. The odds of all three coming together at once were less than one in 100,000. That's less than once in 270 years. That's a perfect storm.
Do metaphorical perfect storms happen in politics and capital markets?
The answer is yes, provided the conditions of the perfect storm definition are satisfied. The multiple events that make up the true perfect storm must be independent and rare and come to converge in an almost impossible way.