What is the meaning of ' BECMG 2220/2221 33004MPS '? ------------------------------------------------------------------- TAF ZBAA 220920Z 2212/2312 33009G18MPS CAVOK TX12/2307Z TN00/2221Z BECMG 2220/2221 33004MPS BECMG 2307/2308 20005MPS
A.
Between 20:00 and 21:00Z on the 22nd day, the wind will gradually change to 330 deg. at 4 mps.
B.
Between 22:20 and 22:21Z, the wind will gradually change to 330 deg. at 4 mps.
C.
Between 20:00 and 21:00 LMT, the wind will gradually change to 330 deg. at 4 mps.