EESA09H3 Lecture Notes - Lecture 5: Sediment Transport, Supercooling, Climatology
5 Dec 2017
School
Department
Course
Professor
Document Summary
In lecture 2 we examined the large scale circulation of the world. Midlatitude cyclones occur within the moving boundary of the ferrel and polar cells referred to as the polar front. A series of low and high pressures propagate along the polar front. These lows are called midlatitude cyclones and largely characterize the weather conditions of the midlatitudes in the fall, winter and spring. During the summer the polar front often lies to the north of the great lakes region. Storms during the summer are either mid- latitude cyclones or convective storms arising from surface heating. Midlatitude cyclones, commonly referred to as low pressures, are the major source of weather variation in the midlatitudes (30 to 60 ). These storms occur approximately 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).
