Geog 203 Notes Test 2

Geog 203 Notes Test - Disturbances in Atmospheric Circulation Thunderstorms Stages o Initial/cumulus cloud strong uprising of air where

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Hurricane Tracks: Disturbances in Atmospheric Circulation: Thunderstorms: - Stages: o Initial/cumulus cloud- strong uprising of air where condensation is formed. As the air goes up, the clouds get taller. o Mature Stage- the currents that develop static electricity which causes lightning Thunder- compacted contraction of heated air o Dissipating Stage- when cloud is so tall that the upper winds start shifting the top of the cloud to the side. EX: Air Masses and Fronts : - Air mass – a body of air where temperature and moisture are relatively equal. - Air masses form because: o Latitudinal Position: Large scale circulation patterns that declare the thermal position o Underlying surface: They pick up characteristics of the surfaces that the air masses are passing over which declares the moisture content Air mass moving over water or land - Fronts – boundaries between 2 different air masses o Different Types: Frontal- instable air mass is forced on top of the other air mass because of the temperature. Cyclonic Storms: - Frontal Storms – Wave Cyclones – series of frontal storms that are associated with a center of low pressure. (tornadoes and hurricanes also have a center of low pressure). - Tornadoes- centers of low pressure that are very small but most intense and most frequent. o Very Dark because of materials(dust) flying around o Turns counter clockwise and occurs mostly during the spring in the Midwest o Low pressure causes the most damage because the inside of objects, like a house has high pressure o Occurs because of:
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Multi-directional winds An unstable low pressure developing A series of frontal air masses A jet stream dipping down on unstable air - Hurricanes – very large and very powerful. o Known as tropical cyclones or typhoons that occur in the tropics o Near the equator, the coriollios effect is very weak and the strong air masses are missing so the hurricane isn’t as powerful o When oceans get heated, a hurricane will appear o Ingredients for Hurricanes: Need water bodies that have warm water Wind has to exceed 74 mph to be considered a hurricane o Slow rotating, relatively slow low pressure cells that have the ability to pick up moisture Occur during summer and fall o STAGES: 1. Beginning/Insipient Stage: Warm waters with the development of low pressure causes a thunderstorm that will usually dissipate but if not will move on to the next stage 2.Cold Core Stage: well developed wind circulation 3. Warm Core Stage: eventually the air comes back down to the eye and descending air warms causing evaporation 4: dissipating stage: stops when reaches to land - Reasons for all Storms: o 1. When air masses collide o 2. Low pressure systems that start circulating o 3. Strong up rises of heated air Climate Control: - Climate- controls almost everything we do. -
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This note was uploaded on 03/25/2008 for the course GEOG 203 taught by Professor Guneralph during the Spring '08 term at Texas A&M.

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Geog 203 Notes Test - Disturbances in Atmospheric Circulation Thunderstorms Stages o Initial/cumulus cloud strong uprising of air where

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