Raw T# 7.5 Weakening Flag : OFF
http://tropic.ssec.wisc.edu/real-time/adt/20W.GIF
http://tropic.ssec.wisc.edu/real-time/adt/20WP.GIF
https://www.jma.go.jp/jp/gms/largec.html?area=6&;element=0&time=201910071750&line=0