EESA09H3 Lecture Notes - Wind Shear, Polar Front, Northern Canada
8 Dec 2011
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Document Summary
Effects of great lakes hurricanes: a lot of rainfall. This hurricane: gulf low from gulf of mexico. Air masses are major components of mid-latitude cycles. Under certain circumstances snow storms can be very disastrous. Midlatitude cyclones can act as a precursor to thunderstorms or tornadoes. Are small components of midlatitude cyclones, the whole system, when you put together the fronts you have the whole system. There are 4 types of fronts; are usually at the division between the air masses: stationary, warm, cold, occluded. When air masses move and create battleground, that stationary front becomes unstable associated with an horizontal wind shear (horizontal gradient of wind direction and can be unstable) step #1. Step #2 cold front and warm front pushing against each other, wind direction in a low pressure system is counter-clockwise. Under certain conditions, along the polar front, the cp and mt are pushing against each other; this is the pivot point and it"s the lowest local pressure.
