Some of the signs are as under :
1) Market opens near the low or high. In a big bearish day like yesterday,market opens and finds it difficult to make any progress on the up side In big bullish days,market opens,does not dip much,and starts climbing. So the open to low/high is your first sign of a large trending day.
2) The movement is in one direction,no reversals in between....
3) A few large bars,WRBs
4) Observe yesterdays market action....market comes down,goes sideways distribution,attempts very feeble rally and crashes big....and the process gets repeated 2-3 times.
5) Large volumes on bars in direction of trend....volume dries up in the reverse move.
6) It has been my observation that market gives a countertrend move between 2-2:30. On large range days,this move is either absent or is very feeble. That tells you that in yesterdays case....all the hopefuls who have bought in every dip are trapped and they will get panicky and it is their selling long positions/doubling which is going to give you a big thrust between 3:00 and 3:30. You have known that you will have great time between 3:00 and 3:30 and all trapped traders are going to work for you....So just sit back and let them work to your advantage.... It is a great fun identifying this and encashing this situation...
7) You can feel the traction or torque the mkt develops on large range days.
Best wishes,
Smart_trade