https://phys.org/news/2018-11-nasa-gpm-small-area-heavy.html

That heaviest rainfall was displaced from the center because of moderate vertical wind shear pushing it from the center. In general, wind shear is a measure of how the speed and direction of winds change with altitude. Wind shear can tear a tropical cyclone apart or weaken it.

At 10 a.m. EST (1500 UTC) on Nov. 26, Man-yi was a weak tropical storm with maximum sustained winds near 35 knots (40 mph/74 kph). It was centered near 21.4 north latitude and 132.1 east longitude, about 406 nautical miles southeast of Kadena Air Base, Okinawa Island, Japan. Man-yi has tracked north-northwestward.