 Wind speeds for the strongest tropical storms increased from an average of in 1981 to in 2006, while the ocean temperature, averaged globally over all the regions where tropical cyclones form, increased from to during this period.A 2017 study looked at compounding effects from floods, storm surge, and terrestrial flooding (rivers), and projects an increase due to global warming.In 2020 a study was published, saying that climate change is increasing the likelihood of a storm of 3 category or above by 8% per decade.