Rapid Intensifying Tropical Cyclones in the Philippine Area of Responsibility from the year 1991 to 2020

Rapidly Intensifying Tropical Cyclones are one of the most destructive natural disasters, especially if it rapidly intensifies while nearing landfall point. The researchers are looking for the trends, and periodicities of Rapidly Intensifying Tropical Cyclones from 1991 to 2020 inside the Philippine Area of Responsibility (PAR). For the trends, the researchers have used the Mann–Kendall test, while for the periodicities, the researchers have used the Lomb-Scargle periodogram. On average, around 18.7 tropical cyclones have been named by the Philippine Atmospheric Geophysical and Astronomical Services Administration yearly from 1991 to 2020, with 2.2 of those rapidly intensifying (30 kt increase in 24 h) tropical cyclones. Rapid intensifying tropical cyclones pose threats to Filipino people, especially those who are exposed to tropical cyclones. There were no significant changes in the trends, while there were approximately 21.4 years of gap in the average peak of rapidly intensifying tropical cyclones in terms of periodicities. From 1991 to 2020, September to October recorded the highest number of tropical cyclones that rapidly intensified.