It's A Cloudy Day.

Today is a cloudy day. This (In the) morning, when I went to the canteen for breakfast, I heard (there were) several crows cawing in the tree outside. (crying on the tree.) I felt very uncomfortable/uneasy. Then, after having/finishing breakfast, I went to the library and heard the (about a) shocking news that a girl had jumped from one of the buildings of my school in the early hours. (morning.) What a tragedy (pity)! I was so sorry/saddened to hear that. I have still (just has) not figured (it) out (that) why somebody would commit suicide.

A sad story but your writing is fine. In the title, it is usual to write with initial capitals. We would likely use 'in the morning' if we were going on to talk about other things which were happening throughout the day - ie: 'in the morning I did.....'.......'after lunch I  .....'  ...'come evening I.....' . As you are only referring to what happened in the morning, you only need to say 'this morning'. I suggested an alternative word 'heard' as it introduces more feeling and the sound of the crows is 'cawing'. These birds have several different sounds by which they communicate. For very early morning, we tend to say 'the early hours' so if you were out late (after midnight) at a party or attending a late night meal, you can say you didn't return home until 'the early hours'. I suggested 'tragedy' as an alternative as it is a stronger and more appropriate word -means it is a great waste of a human life. Pity means 'what a shame', 'bad luck' etc. - eg 'Oh, I missed my bus, what a pity!' - but is not strong enough in this context. If you said 'what a great pity' then, that would be much better and acceptable. 

It's a Cloudy Day

Today is a cloudy day. In the morning when I went to the canteen for breakfast there were several crows crying on the tree. I felt very uncomfortable. Then after having breakfast, I went to the library and was shocked to hear that heard about a shocking news that a girl had jumped from one of the buildings of my school in the early morning. What a pity! I was so sorry to hear that. I just has not have not figured it out that why somebody would commit suicide.

--Very good writing, Camille.