Who could ever forget the hurricane season of 2005 with Katrina and no end of massive hurricanes all in one tropical cyclone season? In a recent article in Geophysical Research Letters, two Louisiana State University scientists examine one record-breaking characteristic of that fateful year. Keim and Robbins note “The 2005 Atlantic hurricane season set many records including the greatest number of named tropical storms and hurricanes at 27, and the greatest total hurricanes at 15. Another record from 2005 includes 7 named tropical storms and hurricanes before 1 August. The 2005 season began early and remained active from June to January (2006).”
They gathered data on start dates of hurricanes from 1851-2005, and found that “Other seasons with storms with early dates of occurrence include 1887, 1933, 1936, and 1995.” There is no trend here with three of the five years with early storms occurring between 1887 and 1936. They made no link to global warming, but they did conclude “All of these seasons are associated with a positive phase of the Atlantic Multidecadal Oscillation” which is the warm phase of the oscillation.