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Occurs when a) Current bar's low is higher than the previous bar's high in an uptrend or b) Current bar's high is lower than the previous bar's low in a downtrend. This is caused by some type of exuberance in driving the stock to create a gap between the extremes of the previous bar and the current bar. Examples include some important news (good or bad) after the market has closed or even economic news or some other stimulus that accounts for the exuberance.
Usually occur after the breakout from a consolidation region. It generally identify the start of a strong trend, where high volume typically follows the occurrence of a gap. The strong trend usually continues long enough for several new highs or lows to occur after the gap.
Occurs in the middle of a strong trend, whereby after a runaway gap, prices continue to make new highs or lows without pulling back to close the gap. They often appear halfway through the move. Volume after the occurrence of the gap is usually high.
Excessively wide gaps that occur at the end of a trend. They tend to occur on high volume like the "last gasp" at the end of a trend. Generally not followed by many new highs, frequently enter a consolidation period and gap closes very quickly (usually within 5 bars or so).
Tends to be an exhaustion gap follow by a breakaway gap in the opposite direction
Signals an important market turn
Characteristics
A lengthy trend leading into the pattern.
An initial price gap.
A cluster of price periods that tend to trade within a definable range.
A pattern of increased volume near the gaps and during the island compared to preceding trend.
A final gap which establishes the island of prices isolated from the preceding trend.