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This paper focuses on the investigation of sea surface temperature (SST) and the rainfall variations due to typhoon CHAN-HOM and Nangka occurred in 2015 over Northwest Pacific Ocean (NPO). On 7-13 July, the SST cooling area occurred mainly in the middle of the two typhoons track, the maximum SST decline reached more than 4˚C during typhoon CHAN-HOM and Nangka passage. Due to the collective effect of typhoon CHAN-HOM and Nangka, the SST cooling phenomenon maintained for about 15 days. Typhoon CHAN-HOM and Nangka produced heavy rainfall and the maximum daily rainfall was 120 mm (8 July) and 130 mm (11 July). In a1, c area, the average temperature and rainfall basically showed a positive correlation with correlation coefficient of 0.54, while on area a2, the correlation coefficient was −0.6.

This paper focuses on the investigation of the rainfall variations due to twin typhoons Saola and Damrey occurred in 2012 over Northwest Pacific Ocean (NPO). Genesis and landfall of the two typhoons are on the same day, however the track and rainfall area are different. We have chosen the Global Precipitation Climatology Project (GPCP) and Tropical Rainfall Measuring Mission (TRMM) data for this analysis. The results are illustrating as follows: typhoon Saola produced higher rainfall than typhoon Damery. The rainfall pattern of typhoon Saola having sufficient affect typhoon Damrey rainfall over the ocean, however after landfall produced rainfall over the land. Comparison of two rainfall data sets revealing that TRMM data is better for identifying heavy rainfall due to typhoon.

• The typhoon induced SST cooling (around 1.9°C) area is located on the right of typhoon track. The SST cooling happened due to rainfall; but there is a time lag of two days over the coastal area. • Strong correlation coefficient (CC) of-0.78 found between translation speed and SST. Smaller SST variations in the typhoon area could lead to substantial variation in precipitation (the CC is-0.72). The Net heat flux is having an impact on SST cooling and warming also having a good positive relation with SST (CC 0. 74).

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