＜Slight Heat＞-little hot
Although the weather was hot,it was not the hottest.

＜After this day,it was getting hot＞
It implied that it was getting hotter day by day after "slight hot"

＜Slight heat blew east wind＞
If this day with east wind,it was getting little cool.
It was an omen of typhoon. People have to prevent it.