Useful tools for this purpose include these:
MACD (Chapter 8): Maintain weekly and daily MACD calculations. Look for trends in MACD, positive and negative divergences, slopes of rises and declines in MACD, and particularly trendline breaks in the slopes of moving average lines. Slow MACD is very useful in this regard.
Moving average trading channels (Chapter 9): These work well in conjunction with MACD and also on their own for intermediate trend as well as shorter-term and longer-term trend analysis.
Rate of change indicators: Ten-day rate of change measurements, 21-day rate of ...