Chapter5 - Chapter 5: Weather Systems Norwegian Cyclone...

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1 Chapter 5: Weather Systems Norwegian Cyclone Model: Polar Front Theory Mid Latitude Cyclones: extratropical cyclones, Nor’easters Hurricanes Storm Surge Mid-latitude 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 5 Types of Fronts : -warm -Cold -S t a t i o n a r y - Occluded
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2 Occluded Front : - rapid moving cold front overtakes a warm front -warm air driven aloft -precipitation from wedging -strong temperature gradients -intense weather Life of a Midlatitiude Cyclone (2-10 days) 6 basic stages Front develops Wave develops Cyclonic circulation established Occlusion begins Occluded front developed Cyclone dissipates Cyclone generally move from west to east Steered by the general westerly circulation Right side of the storm passes first Idealized Weather of a Mid-latitude Cyclone Idealized Weather of a Mid-latitude Cyclone Regions of Cyclogenesis - Topographic irregularities (Mnts) - Temperature contrasts (land/sea) - Ocean current influence (hurricanes)
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In general east to northeast track Most of the north Pacific storms that influence the west coast do not make it over the Rockies in tact (redevelop) Storm Tracks: Patterns of Movement East Coast FL/Bahamas Gulf Alberta Colorado Nevada Regions of Cyclogenesis Davis and FitzGerald, 2004 Modern View: The Conveyor Belt Model 3 intersecting air streams (belts) 2 belts originate at the surface and ascend 1 belt originates aloft and descends Nor’easters November 1950 La Guardia Airport FDR Drive December 1992 Ref: Bloomfield, J., M. Smith and N. Thompson, 1999.
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This note was uploaded on 07/18/2011 for the course EARTH SCIE 334 taught by Professor Buonaiuto during the Fall '09 term at CUNY Hunter.

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Chapter5 - Chapter 5: Weather Systems Norwegian Cyclone...

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