It is difficult to detect altcoin's rise and explosion, even for 1 or 2 days before. Maybe when you see the price start rally and the price moving so fast, that can be a sign for the coin to increase. But still, that will not guarantee that coin to get an explosion because that can be a fake sign to attract more traders attention. If that is a success, the price will start increase and sometimes, the rally can happen. RSI, CCI, MACD, or else is the indicator that you can use to know the sign. But it is difficult to detect the rise of altcoins.