Relationship Between OLR Low-frequency Oscillations and the Formation of Typhoon over the Western Pacific

The composite analyses were completed of the 30–60 days filtered OLR data during the six years of 1975—1977 and 1979—1981 based on the evolution of the average OLR over West Pacific where typhoon generates frequently. The results show clearly that the systems concerning the typhoon formation are mostly located over the low latitude regions in the Eastern Hemisphere (to the east of 60°E). Some clear characteristics are found for the different stages, i., e. the frequency formation, the intermission of typhoon and the transition stage, respectively. These results will be useful to the medium range forecast of the typhoon formation.