By late morning in New York, the first burst of activity from the open and the morning data has usually passed. London traders start leaving, and liquidity drops.
Many days show a pattern: a strong morning move stalls or retraces around 11:00 to noon New York time. Trend followers who entered late find the move losing steam.
The reason is partly mechanical. London desks close positions before their day ends, and the overlap fades. Fewer participants mean less follow-through.
For scalpers, it signals a change in conditions. Momentum setups that worked in the first two hours may begin to fail, and range setups gain ground.
A practical adaptation is tightening targets or switching to a mean-reversion approach after 11:00. Or stopping altogether if the best part of the session has passed.
Checking the journal by hour shows whether results fall off after that time.
Do the results change after the London close approaches, and was the approach adjusted?