Geography 1111 Lecture 14 Notes
Geography 1111 Lecture 14 Notes GEOG 1111
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This 2 page Class Notes was uploaded by Bridget Notetaker on Monday September 19, 2016. The Class Notes belongs to GEOG 1111 at University of Georgia taught by Hopkins in Fall 2016. Since its upload, it has received 21 views. For similar materials see Intro to Physical Geography in Geography at University of Georgia.
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Date Created: 09/19/16
Geography 1111 Lecture 14 Notes MidLatitude Wave Cyclone is a lowpressure cell that forms and moves along a frontal boundary o It exhibits counterclockwise circulation (NH) around the low center and produces a wavelike deformation of the front Stages of the Wave Cyclone Life Cycle: ***the main ones to remember are 3, 4 and 5*** o Stage 1: Two air masses, a cold (cP or mP) and a warm (mT) are set up along a front and move parallel to it o Stage 2: A wave forms as warm air starts to move pole ward while cold air moves equator ward o Stage 3: Cyclonic (counterclockwise) circulation develops, with general convergence at the surface and uplifting The warm air overrides the cold air (frontal wedging) and a Cold Front and Warm Front are established o Stage 4: The Cold front moves faster than the warm front and begins to overtake it This is the beginning stage of occlusion and the basic formation of an Occluded Front o Stage 5: Full development of an Occluded Front has a occurred and the system is at its maximum intensity It exhibits a steep pressure gradient and strong winds and it is in this stage when the severest weather (tornadoes, hail, etc.) will likely occur, if it is going to occur o Stage 6: The pressure gradient weakens, energy supply is exhausted and system dissipates A MidLatitude Wave Cyclone can be thought of as having 3 sections based primarily on temperature, but exhibiting different weather as well o Warm Sector: the area between the Warm Front and the Cold Front o Cool Sector: the area ahead of the Warm Front o Cold Sector: the area behind the Cold Front Winds of a Wave Cyclone: o Warm sector: the winds are primarily southwesterly and southerly o Cool sector: the winds are primarily southeasterly to easterly and then northeasterly as you move counterclockwise o Cold sector: the winds in this sector are primarily northerly to northwesterly, then westerly as you move counterclockwise o Remember, we name winds for the direction they are coming from Moisture, Sky and Weather Conditions: o Warm sector: Has humid to very humid conditions, often with clear skies to scattered cumulus clouds It exhibits warm temperatures Here in the U.S. this is primarily mT air off the Gulf of Mexico Precipitation may be associated with the advancing cold front o Cool sector: Has humid to very humid conditions with a large area of stratus and nimbostratus clouds Light to moderate precipitation along and ahead of the warm front It exhibits cool temperatures o Cold sector: This sector exhibits dry, clear air back from the cold front, but often has intense precipitation (thunderstorms) along the cold front It has cold temperatures MidLatitude Wave Cyclones usually take between 37 days to form and cross the U.S. as they are pushed by the geostrophic wind pattern, primarily the Jet Stream, from west to east along Storm Tracks o These tracks shift with the seasons, being more northerly in the summer and southerly in the winter