EESA09H3 Lecture Notes - Lecture 4: Sebastian Junger, Step One, Sediment Transport

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Occur within the moving boundary of the ferrel and polar cells referred to as the polar front. Commonly referred to as low pressures, are the major source of weather variation in the midlatitudes 30o to 60o. These storms occur apporx every four to seven days. In north america, they occur at the boundary of two major air masses, a cold, polar air mass (cp) and a moist, tropical air mass (mt) The warmth and latent heat in the water vapor of the mt air provide the nergy for the storms. In north america, there are four major regions of cyclone development. Two of the regions are on the lee-side (eastern side) of the rocky mountains producing alberta. The other two regions have cyclones developing over ocean bodies. Gulf lows begin over the gulf of mexico and hatteras lows (nor easters) off the eastern coast of the united states. Typically 100s to 1000s km in extent (larger than hurricanes)

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