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A cold front is the leading edge of a cooler mass of air at ground level that replaces a warmer mass of air and lies within a pronounced surface trough of low pressure.It often forms behind an extratropical cyclone (to the west in the Northern Hemisphere, to the east in the Southern), at the leading edge of its cold air advection pattern—known as the cyclone's dry "conveyor belt" flow.
In a warm occlusion, the cold air mass overtaking the warm front is warmer than the cold air mass receding from the warm front and rides over the colder air while lifting the warm air. [ 2 ] A wide variety of weather can be found along an occluded front, with thunderstorms possible, but usually their passage is also associated with a drying of ...
A squall line is an elongated line of severe thunderstorms that can form along or ahead of a cold front. [25] [26] In the early 20th century, the term was used as a synonym for cold front. [27] The squall line contains heavy precipitation, hail, frequent lightning, strong straight line winds, and possibly tornadoes and waterspouts. [28]
They typically have fronts attached to them, with a cold front extending south of the low and a warm front extending to its east. Winds circulating around the low are in a counterclockwise motion ...
The advancing cold front across the central United States for midweek will shift the risk for drenching and locally severe thunderstorms eastward as well.
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 cold front, thunderstorms and a spreading bout of record heat are some of the weather extremes extending from coast-to-coast in the U.S. this week. ... Though the rain could cause flooding ...
The inflow into a thunderstorm, or complex of thunderstorms, is the circulation of warm and humid air ahead of a trigger convergence zone such as a cold front. This airmass is uplifted by the trigger and form convective clouds.