chapter9gh - Chapter 9: Weather Patterns Mid Latitude...

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1 Chapter 9: Weather Patterns Mid Latitude Cyclones: extratropical cyclones, Nor’easters Region southern FL to Alaska Lifecycle and associated weather Regional Influence Generates cyclone at the surface Polar Front Theory : - Norwegian Cyclone Model -WWI -describes birth, growth and decay of cyclones 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 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
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2 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 200 1 Warm Front : - adiabatic cooling -cloud sequence -gradual slope & slow advance: widespread, light precip. long duration -precipitation precedes front -E to SW wind shift 200 1 Warm Front : - precipitation and temperature profile 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 100 1 Cold Front : - precipitation follows the passage of the front -steeper frontal boundary & speed: more violent weather -altocumulus and cumulonimbus 100 1
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3 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 100 1 Stationary Front : - little to no horizontal movement across the front by either air mass -lateral motion - overrunning , light precipitation Occluded Front : - rapid moving cold front overtakes a
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This note was uploaded on 07/18/2011 for the course EARTH SCIE 130 taught by Professor Frankbuonaiuto during the Fall '09 term at CUNY Hunter.

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chapter9gh - Chapter 9: Weather Patterns Mid Latitude...

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