Posted by David Reimer | November 23, 2020 8:22 pm | … Our thinking remains the same as yesterday. A supercell is a thunderstorm characterized by the presence of a mesocyclone: a deep, persistently rotating updraft. Updrafts, and therefore new cells, continually re-form at leading edge of system with rain and hail following behind. QUESTION FOR THOUGHT: Explain why squall-line thunderstorms often form ahead of advancing cold fronts but seldom behind them. For this reason, these storms are sometimes referred to as rotating thunderstorms. A squall line is a narrow band of active thunderstorms. Of the four classifications of thunderstorms (supercell, squall line, multi-cell, and single-cell), supercells are the overall least common and have the potential to be the most severe. Squall line is a common term you might hear meteorologists say when there is a threat of severe thunderstorms in your area. Select Page. See more. d. Supercell. Q: Can a line of thunderstorms not be called a squall line? Multi-cell Line (Squall Line) Sometimes thunderstorms will form in a line which can extend laterally for hundreds of miles. Squall line definition, a line or extended narrow region within which squalls or thunderstorms occur, often several hundred miles long. A nonfrontal, narrow band of active thunderstorms that often develop ahead of a cold front is known as a a) prefrontal system b) squall line c) dry line Squall lines also typically have an area of stratiform rain that trails the main line of thunderstorms (called the "trailing stratiform" region), although depending on how the upper-level winds are blowing, the area of stratiform rain occasionally is ahead of the squall line or even parallel to it, so there's more than one flavor of squall line!! Often it develops on or ahead of a cold front in moist, unstable air, but it may develop in unstable air far removed from any front. 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