 The squall line contains heavy precipitation, hail, frequent lightning, strong straight line winds, and possibly tornadoes and waterspouts.Severe weather in the form of strong straight-line winds can be expected in areas where the squall line itself is in the shape of a bow echo, within the portion of the line that bows out the most.Tornadoes can be found along waves within a line echo wave pattern, or LEWP, where mesoscale low pressure areas are present.