Weather Front- Yeoh Yi Le Dorcas 7 Omega

This post is for people like me that are struggling to understand about the Weather Systems over the British Isles. Read it and you will understand it. REALLY. 


A weather front is a boundary separating two masses of air of different densities, and is the principal cause of meteorological phenomena. In surface weather analyses, fronts are depicted using various colored lines and symbols, depending on the type of front. The air masses separated by a front usually are different in temperature and humidity. Cold fronts may have narrow bands of thunderstorms and severe weather, and may on occasion be preceded by squall lines or dry lines. Warm fronts are usually preceded by stratiform precipitation and fog. The weather usually clears quickly after a front’s passage. Some fronts produce no precipitation and little clouds, although there is a wind shift. 

Warm Front

  • leading edge of a homogeneous warm air mass
  • located on the equator ward
  • moves more slowly than the cold front which usually follows because cold air is denser and harder to remove from the Earth’s surface
  • Clouds ahead of the warm front are mostly strati form
  • On weather maps, the surface location of a warm front is marked with a red line of semicircles pointing in the direction of travel.


Cold Front

  • located at the leading edge of the temperature drop off
  • leading edge of a cooler mass of air
  • normally lies within a sharp surface trough
  • produce sharper changes in weather and move up to twice as quickly as warm fronts, since cold air is denser than warm air and rapidly replaces the warm air preceding the boundary
  • On weather maps, the surface position of the cold front is marked with the symbol of a blue line of triangle-shaped pips pointing in the direction of travel, and it is placed at the leading edge of the cooler air mass.
  • come in association with a low pressure area




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