SONGDA continued to remain at low latitudes in the next couple of days.
桑达于未来数天纬度增加不多。
As divergence improved, SONGDA gradually intensified into a severe tropical storm later on May 22.
随著辐散转好，桑达于22日增强为强烈热带风暴。
SONGDA finally turned into an extratropical cyclone as it reached the southern coast of Honshu, Japan.
桑达最后在到达日本本州南部时演变为温带气旋。
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