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Fronts Fronts are boundaries that separate air masses of different densities (heaviness). One air mass is usually colder, drier and denser (heavier). The other is warmer, less dense (not as Earth’s surface heavy) and contains more moisture The air masses clash Since one is moving Faster than the other. Little mixing of the air occurs. Warm air • A warm front occurs when:The warm air occupies the territory that had cooler air (it seems like the warm air is pushing the cold air away) • The warm front is represented by red semicircles on the same side of a line Cold air Warm air Earth’s surface This point here is called a warm front A cold front occurs when the cold air occupies the territory that had warmer air (it seems like the cold air is pushing the warm air away) • The warm front is represented by red semicircles on the same side of a line Cold air Warm air Earth’s surface This point here is called a cold front • When warm air ascends over (moves over) the retreating cold air, it cools to produce clouds and precipitation usually occurs (it rains) • Cold fronts are normally steeper than warm fronts and moves quicker across the landscape. It usually has more violent weather Stationary fronts Cold This is called a stationary front Warm does not move or is almost motionless. The winds blow parallel to the front but in opposite directions to each other Occluded front - is when an active cold front overtakes a warm front • Occluded front symbol: red semi-circle and blue triangles on same side of line (alternate pattern) Light rain falls Warm air Cold air here Heavy rain falls here Cold front Cool air Cold air Cool air Warm front Use this knowledge and write down from local weather news what type of fronts are observed for one week Occluded front
