Everytime BTC.D hit one of these red boxes they reject and Alts pump. 

Next week when it hits 60%, some Alts especially eth based tokens can rally hard very unexpectedly. 

We have token unlocks planned for sep, in order to dump it, market makers need exit liquidity. So they give you false hope by pumping few Alts so high so you think the dump is over. When you buy, they dump it even lower. 

A real huge alt season begins when BTC.D hits 75% and rejects. By the time $BTC reaches 40-44k area, BTC.D hits 75% and we will see a full fledged alt season.