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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.

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. ... Cold fronts tend to be associated with the most violent weather among all types of fronts. ... with squall lines (a line of strong thunderstorms parallel to and ahead of the front) .

snowball.millersville.edu/~adecaria/ESCI241/esci241_lesson15_airmasses.pdf

In order to form, and air mass must remain in its source region for a week or more . ○ Source ... For example, if a continental polar air mass (cP) moves out over the warm water, it becomes (cPk). .... May have squall line well ahead of front. STATIONARY ... О Most cold fronts are between cP and mT air masses. О Most warm ...

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

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

usatoday30.usatoday.com/weather/resources/askjack/wjack3.htm

A: Thunderstorms often occur along or slightly ahead of a cold front. .... A: Lightning strikes are more likely over the world's oceans due to their enormity, ... Q: If a cold front is the front edge of a mass of cold air at the ground, is there a cold .... Many supercell thunderstorms and squall lines that form in the central USA are the ...

www.weather.gov/media/zhu/ZHU_Training_Page/Miscellaneous/fronts/fronts.pdf

the form of a trough. If there .... is a band of moderate precipitation well ahead of the surface cold front, with low ... If warm and cold air masses don't clash, then why are severe weather ... during the next severe weather outbreak: more than likely, you'll find that ... Sometimes a squall line will form along a cold front, and the.

www.weather.gov/media/lmk/soo/SvrWx_Fcstg_TipSheet.pdf

0-3 km SRH > 150 m2 s-2 = updraft rotation becomes more likely ... BRN 10-50 – supercells possible – higher numbers especially if boundary present ... Unstable warm sector air mass, with well-defined warm and cold fronts (i.e., strong extratropical ... Discrete supercell at southern end of line: deep layer shear vectors cross ...

en.wikibooks.org/wiki/High_School_Earth_Science/Changing_Weather

They most commonly form in polar and tropical regions, which have very ... If the air mass is colder than the ground, it is given the designation k, for cold. ... front, ( 3) stationary front, (4) occluded front, (5) surface trough, (6) squall line, .... As the front passes over you, the temperature and dew point rise and the rain likely ends .