Today's diary entry 2016.1.18 18.1.2016 (this is how we write the date in English.  Day/month/year. )

Today was very cold because it snowed in Tokyo.
Tokyo is vulnerable  prone to snow in the winter. (vulnerable = weak, defenceless - generally used in reference to people; prone = likely to occur)
So many trains and buses were delayed.
The station overflowed with persons people. (1 person, 2/3/4/5 etc. people)
My mother waited in  the station for 2 hours but she couldn't get on train. (can't = present; couldn't = past.)

今日はとても寒かったです。なぜなら東京は雪が降ったからです。
東京は雪に弱い。なので多くの電車、バスが遅れました。
駅は人であふれました。私の母は2時間駅で待ちましたが電車に乗れませんでした。