Editing Surface weather analysis (section)

==== Cold front ====
{{Main|Cold front}}
A cold front is located at the leading edge of a sharp temperature gradient on an [[Isotherm (contour line)|isotherm]] analysis, often marked by a sharp surface pressure [[Trough (meteorology)|trough]]. Cold fronts can move up to twice as quickly as warm fronts and produce sharper changes in [[weather]] since cold air is denser than warm air and rapidly lifts as well as pushes the warmer air. Cold fronts are typically accompanied by a narrow band of clouds, showers and thunderstorms. On a weather map, the surface position of the cold front is marked with a blue line of triangles (pips) pointing in the direction of travel, at the leading edge of the cooler air mass.<ref name="DR"/>