<Tr> <Td_colspan="3">--William Makepeace Thackeray, Vanity Fair </Td> </Tr> <P> The first use of the expression in the meteorological sense comes from the March 20, 1936, issue of the Port Arthur News in Texas: "The weather bureau describes the disturbance as "the perfect storm" of its type . Seven factors were involved in the chain of circumstances that led to "the flood". </P> <P> In 1993, journalist and author Sebastian Junger planned to write a book about the 1991 Halloween Nor'easter storm . Technically, this storm was an extratropical cyclone . In the course of his research, he spoke with Bob Case, who had been a deputy meteorologist in the Boston office of the National Weather Service at the time of the storm . Case described to Junger the confluence of three different weather - related phenomena that combined to create what Case referred to as the "perfect situation" to generate such a storm: </P> <Ul> <Li> warm air from a low - pressure system coming from one direction </Li> <Li> a flow of cool and dry air generated by a high - pressure from another direction </Li> <Li> tropical moisture provided by Hurricane Grace </Li> </Ul>

What is meant by a turnaround in the perfect storm