EESA09H3 Lecture Notes - Lecture 5: Climatology, Polar Front, Wind Shear
3 Jun 2018
School
Department
Course
Professor
Hurricane: Revisited
• Normal year (Low wind shear)
• El Nino (High wind shear)
• During El Nino year, there is fewer hurricanes due to wind shear
• During El Nino the hurricane activity increases in the Pacific and decreases in the Atlantic
• During El Nino year, the temperature changes occur on the sea surface
Midlatitude (35-60 degrees N and S)
Multitude Cyclone
• Low pressure/frontal system
• In Southern Ontario, it mostly occur in the Fall and Winter
• Could be huge or short period cyclone
• Product of collision of air masses
• Larger than hurricane center
• Can have thunderstorms and tornados associated with it
Climatology of the Multitudes
• Polar front is more dominant in the mid-latitude
• Dominant lows are the reasons for the mid-latitude fronts
Air Mases revisited
• cP and mT
Fronts
• identified in WWII
• uses air masses to plan their battle to defeat the enemy or to avoid
• stationary front= relaxed energy/stable/horizontal wind shear/low pressure trough; designated
by alternate semi-circle and triangle
• cold front= triangles on one side
• warm front= red semi-circles
• occluded= responsible for storm to develop; alternate semi-circle and triangle on one side
• used by meteorologists around the world
Cold Front
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