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A squall line, or quasi-linear convective system (QLCS), is a line of thunderstorms, often forming along or ahead of a cold front. In the early 20th century, the term was used as a synonym for cold front (which often are accompanied by abrupt and gusty wind shifts).
A summer squall line in Southern Ontario, producing lightning and distant heavy rains. Wind shear is an important aspect to measuring the potential of squall line severity and duration. In low to medium shear environments, mature thunderstorms will contribute modest amounts of downdrafts, enough to turn will aid in create a leading edge lifting ...
A squall line is an elongated line of severe thunderstorms that can form along and/or ahead of a cold front. [11] [12] In the early 20th century, the term was used as a synonym for cold front. [13] The squall line contains heavy precipitation, hail, frequent lightning, strong straight-line winds, and possibly tornadoes and waterspouts. [14]
Cold fronts form when a cooler air mass moves into an area of warmer air in the wake of a developing extratropical cyclone. The warmer air interacts with the cooler air mass along the boundary, and usually produces precipitation. Cold fronts often follow a warm front or squall line. Very commonly, cold fronts have a warm front ahead but with a ...
If outflow boundaries or squall lines form over arid regions, a haboob may result. [21] Squall lines are depicted on NWS surface analyses as an alternating pattern of two red dots and a dash labelled SQLN or squal line, while outflow boundaries are depicted as troughs with a label of outflow boundary.
A snow squall is a brief period of intense snowfall and wind that leads to whiteout conditions which could trigger dangerous traffic accidents. Snow squalls are most common in the northern United ...
A squall can approach at such great speed that "traffic is moving west at 70 mph, while the squall is moving east at 30 mph. This gives motorists little time to react," Sosnowski said.
A bow echo is associated with squall lines or lines of convective thunderstorms.These echoes can range in size from 20 to 200 km, and have a life span of 3 to 6 hours. Bow echoes tend to develop when moderate to strong wind shear exists in the lower 2 to 3 km of the atmosph