Environment Counts | Tropical storm maxima migrating toward the poles at a rate of about one degree per decade :
The authors have analyzed an observed metric, storm position at its lifetime-maximum intensity (LMI), that is accurately known for 1982 to 2012. Their analysis has found a pronounced poleward migration in the average latitude at which tropical cyclones have achieved their lifetime-maximum intensity over the past 30 years.
Migration of tropical storm LMI 1982-2012
The poleward trends are evident in the global historical data in both the Northern and the Southern hemispheres, with rates of 53 and 62 kilometers per decade, respectively, and are statistically significant. Together the trend represents a global-average migration of tropical cyclone activity away from the tropics at a rate of about one degree of latitude per decade. Nature 509, 349–352(15 May 2014)doi:10.1038/nature13278
