CUNY PGEOG 130 - Weather Patterns (30 pages)

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Weather Patterns



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Weather Patterns

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Pages:
30
School:
The City University of New York
Course:
Pgeog 130 - Weather and Climate

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Chapter 9 Weather Patterns Mid Latitude Cyclones extratropical cyclones Nor easters Region southern FL to Alaska Lifecycle and associated weather Regional Influence Polar Front Theory Norwegian Cyclone Model WWI describes birth growth and decay of cyclones Generates cyclone at the surface 1 Midlatitude Cyclone primary weather producers low pressure systems 1000 km dia counterclockwise circulation toward center warm and cold fronts upward flow initiates precipitation Fronts boundary surfaces that separate air masses of different densities temperature moisture 15 200km wide line on the weather map 2 Fronts surface slope is gradual warm air overlies cold air air masses move at different speeds one air mass will advance clashing produces weather Fronts warm air is always forced aloft overrunning warm air gliding on top of cold air 3 5 Types of Fronts warm Cold Stationary Occluded Dryline Warm Front warm air mass is advancing displaces colder air at the surface red line with half circles gradual slope 1 200 speed 25 35 km hr 1 200 4 Warm Front adiabatic cooling cloud sequence gradual slope slow advance widespread light precip long duration precipitation precedes front E to SW wind shift 1 200 Warm Front precipitation and temperature profile 5 Cold Front cold air mass is advancing displaces warmer air at the surface cold air more dense forces warm air aloft blue line with triangles steeper frontal boundary 1 100 speed 35 50 km hr 1 100 Cold Front precipitation follows the passage of the front steeper frontal boundary speed more violent weather altocumulus and cumulonimbus 1 100 6 Cold Front same lifting of warm air only quicker over a shorter distance heavy downpours short duration narrow band of precipitation passage of front temperature drops polar air clear skies SW to NW wind shift 1 100 Stationary Front little to no horizontal movement across the front by either air mass lateral motion overrunning light precipitation 7 Occluded Front rapid moving cold front overtakes



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