Long-term Variations in the Frequency of Typhoons and Their Connection with Various Formation Factors

V. V. Krokhin, A. Yu. Fil’, and V. Yu. Veryatin

Variations in the frequency of tropical cyclones in the Northwest Pacific in 1961–2015 and their connection with various factors are analyzed. The examined factors are the occurrence rates of the certain patterns of atmospheric circulation (according to the Vangengeim–Girs classification) in the Pacific-American sector, sea surface temperature in the North Pacific, and the position of the North Pacific High center. Steady relationships between these parameters are revealed.