When a security's price has been falling over time, a wedge pattern can occur just as the trend makes its final downward move. The trend lines are drawn above the highs and below the lows on the price chart pattern can converge as the price slide loses momentum and buyers step in to slow the rate of decline. Before the lines converge, the price may breakout above the upper trend line.
The descending wedge pattern appears within an uptrend when price tends to consolidate, or trade-in a more sideways fashion. Connecting the lower highs and lower lows will reveal the slight downward slant to the wedge pattern before the price eventually rises, resulting in a falling wedge breakout to resume the larger uptrend.