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• Surface weather analysis — A surface weather analysis is a special type of weather map that provides a view of weather elements over a geographical area at a specified time based on information from ground based weather stations. [ Air Apparent: How Meteorologists Learned… …   Wikipedia

• Cyclogenesis — The initial frontal wave (or low pressure area) forms at the location of the red dot on the image. It is usually perpendicular (at a right angle) to the leaf like cloud formation (baroclinic leaf) seen on satellite during the early stage of… …   Wikipedia

• Weather front — 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… …   Wikipedia

• Trough (meteorology) — A trough is an elongated region of relatively low atmospheric pressure, often associated with fronts. Unlike fronts, there is not a universal symbol for a trough on a weather chart. In the United States, a trough may be marked as a dashed line.… …   Wikipedia