A weak low should not be confused with a poor lowA poor low is one which lacks excess and is the opposite of an excess low. A poor low will have less than two TPO's of excess at the bottom of a daily range with at least 2-3 columns of TPO's lining up to form a flat looking bottom. It indicates that there are short term or weak handed shorts at that low of day area. We know this because every time prices sell off to the low, they get covered quickly, thus forming the poor low.
The poor low has two forward looking indications. The first is that prices should bounce away from the poor low as there are a number of shorts trapped at poor location. The second is that if the next day or in some subsequent session, the poor low is revisited, then the odds are strong that it will break and move lower. This is called repair as it repairs the .... The latter speaks to a deficiency in structure and the former deals with the location of the low. A weak low is formed when a market falls and reverses right at a specific point which is often a technical or profile nuance. Some examples would be prior intraday lows, the lower extreme of a value areaA range where approximately 70% of the prior days volume traded. The range is derived from one standard deviation on either side of the mean which is roughly 70%. See: Market Profile, the prior day’s settlement, or the current day’s open. In each case, the location is a mechanical and visual reference that is used by short term traders as an entry point. The low is deemed weak because it can be taken easily when retested due to the short term nature of the buyers who initiated their positions at that level.