A.N-NW-SW B.NE-E-SE C.SE-NE-NNW D.E-SE-SW
A.暖鋒已過境 B.錮囚鋒已過境 C.冷鋒已過境 D.靜止鋒已過境
A.N-NW-SW B.E-SE-S C.SE-NE-N D.NW-NE-SW