Probably won't affect us that much, but could pose some serious problems for the west coast. One of the greatest disasters ever to strike Taiwan was caused by a very similar weather pattern involving a typhoon to the north east and a tropical storm to the south west with Taiwan becoming the meat in the sandwich. Here's a description

"The most serious floods to hit Taiwan in modern times occurred on August 7, 1959. Typhoon Ellen formed in the seas south of Japan, and brought a tropical depression from around the Pratas Islands to Taiwan, causing torrential rains in south and central Taiwan which then created flooding. Rainstorms raged for three days, from August 7 to August 9, covering almost the entire western region, with the heaviest rainfall coming on the 7th. Scholars show that there were 15 places where the rainfall on that day exceeded 500 millimeters, and the storms were centered in Miaoli, Fengyuan, Fenyuan, the upper reaches of the Wu River, Touliu and Alishan.

This sudden, unexpected disaster claimed 667 lives. Another 408 people went missing, 942 people were injured, and there was widespread suffering and unhappiness. All in all, over 300,000 disaster victims were given temporary accommodation by the government. The eventual figure for homes destroyed by the disaster was 27,466, and another 18,303 homes were partially destroyed. Farming, forestry and fishing all suffered heavy setbacks, and a total of 136,542 hectares of farmland alone were destroyed. Railways and roads were severely paralyzed. The railways were struck in 297 different places, and roads in 476."

http://163.20.27.10/web/taiwan/taiwan03/english/eight-seven.htm