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en.wikipedia.org/wiki/Cold_front

A cold front is defined as the leading edge of a cooler mass of air, replacing at ground level a warmer mass of air, which lies within a fairly sharp surface trough of low pressure. It forms in the wake of an extratropical cyclone, at the leading edge of its cold ... If there is significant instability along the boundary, a narrow line of ...

en.wikipedia.org/wiki/Squall_line

A squall line is a line of thunderstorms forming along or ahead of a cold front. In the early 20th ... The concept of frontal zones led to the concept of air masses. ... If squall lines form over arid regions, a duststorm known as a haboob may ... the squall line cause high winds, which are strongest where the line is most bowed out.

www.ess.uci.edu/~yu/class/ess124/Lecture.18.thunderstorm.all.pdf

most important for developing destructive thunderstorms .... Frontal squall lines form in the warm, moist air ahead of surface cold fronts, drylines, or upper-level ...

okfirst.mesonet.org/train/meteorology/Fronts.html

Fronts are zones of transition between two different air masses. ... If the wedge is moving into an area of warmer air, the front is called a cold front. ... be associated with squall lines (a line of strong thunderstorms parallel to and ahead of the front) . ... Although they can trigger thunderstorms, warm fronts are more likely to be ...

snowball.millersville.edu/~adecaria/ESCI241/esci241_lesson17_thunderstorms.pdf

Air mass thunderstorms are more likely to occur over mountains or hills, due to ... A thunderstorm is classified as severe if any one of the following conditions are met: ... Squall lines are narrow, fast moving lines of thunderstorms that occur a hundred ... Since most tornadoes form in the mT air ahead of a cold front, where the.

atoc.colorado.edu/~saraht/atoc1050/Class_News/Chapter18ppt.pdf

Considered severe if contains one or more of the following three things is likely or occurs: Hail with ... airmass (as opposed to along a front). Also called .... form? What role does the cold pool play in the formation of a squall line? How does the ... will happen if the gust front encounters warm, moist air ahead of the.

climate.ncsu.edu/edu/k12/.liftingmechanisms

Jun 25, 2012 ... Lifting mechanisms are forms of lift that cause air to rise. ... The upward motion of air can lead to the formation of clouds and precipitation if there is ... Many times during the Spring and Fall, squall lines or severe ... As a result, thunderstorms are more likely to form with cold fronts rather than warm fronts.

mrcc.isws.illinois.edu/living_wx/thunderstorms/index.html

A thunderstorm is considered severe if one or more of the following criteria are met: ... Single cell air mass thunderstorms grow, produce rain with some gusty winds, ... They often form ahead of cold fronts associated with midlatitude low ... Tornadoes that form in a squall line are often weaker, short-lived tornadoes that ...

www.kids-fun-science.com/thunderstorm-clouds.html

Thunderstorm clouds form when warm air currents rise above the Earth's surface creating ... The cold air mass is heavier and denser than the warm air in a warm front. The cold ... are pushed ahead of the cold front by the jet stream it is called a squall line. ... Most lightning produced by thunderstorms occurs inside a cloud.