A summary of the broadscale tropical circulation from May to October 1991 in the area 40°N–40°S, 70°E–180°, is presented. Oceanic and atmospheric anomalies observed within this region were characteristic of a negative ENSO event. While the summer monsoon was early over India, its seasonal penetration across South-East Asia into the northwest Pacific was late, particularly over the Philippines. Over the northwest Pacific tropical cyclone numbers were near normal. Three cyclones were observed in the southern hemisphere, two over the Indian Ocean and one over the Pacific Ocean.
Carello et al. (Thu,) studied this question.