What is the difference between a bow echo and a line echo wave pattern?

A bow echo looks like a taut bow on a radar display. This type of convective system is moved quickly along by a strong downward jet blowing into the back of the line. Strong-to-severe winds and are a feature of bow echos. A derecho is a particularly strong type of bow echo. A line echo wave pattern (LEWP) looks like a wavy line of multiple-cell thunderstorms on radar. The cyclonic circulation of each cell looks like little low pressure systems all linked together. These small circulations cause the northern parts to 'fall back' and the southern parts to 'race forward' relative to the advancing line. Strong-to-severe weather can be observed on the leading edge of the line...just to the north of each discrete cell.