How you measure the strength of trend?

Well, if there was 100% working method I would be millionaire now. You have only price at your disposal, your every conclusion on trend parameters will always lag for the time you spent on making this conclusion. You can try to predict, but it is another subject.

Strength of trend can be determined using the data about volume of transactions, namely its changes. You can notice that when important event take place, the number of market participants is rapidly surging up, making the market more volatile and hence enhancing the trend. To see where the price goes you can fall back to simple search for S&R according to your timeframe…

We can also use patterns to gauge trend potential. My favourite is Head&Shoulders pattern works in 90% for me.