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Midlatitude Wave Cyclones

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					Midlatitude Cyclone

Ahrens. 2002. Meteorology 7ed.

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Midlatitude Cyclones
• • • • • • • • • • • • • • Introduction Environmental Systems Geographic Grid Rotation and time Earth-Sun Relationships Seasons Earth’s Atmosphere Energy Balance Temperature Pressure and Circulation Moisture Lifting Mechanisms and Stability Condensation, Clouds and Precipitation Air Masses Severe Weather Tropical Weather Climate Soils Ecosystems Biomes
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Introduction Life Cycle of Midlatitude Cyclone
– – – Be able to describe the life cycle of a midlatitude cyclone Be able to describe structure at each stage (cross-section and map view) Be able to describe and explain changes in air mass, clouds, weather, temperature, etc. Be able to describe connection between cyclones, troughs, ridges and Rossby waves

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Migration and Rossby Waves
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• Midlatitude Cyclones 
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Cyclone and Anticyclone

McKnight and Hess. 2002. Physical Geography

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23 April 2001 12:43 PM EDT

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23 April 2001 4:26 PM EDT

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23 April 2001 5:22 PM EDT

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Satellite Infrared 2001

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12-Hour Animation 2001

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Jet Stream Animation

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Midlatitude Cyclone Life Cycle 1. Polar front (before formation)

2. Cyclogenesis
3. Open Stage 4. Occluded Stage 5. Dissolving Stage
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Life Cycle of a Midlatitude Cyclone

McKnight and Hess. 2002. Physical Geography

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Stage 1: Pre-Cyclone Structure

Aguado and Burt. Understanding Weather and Climate

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Stage 1: Wind and Temperature at the Polar Front

Strahler and Strahler. 2000. Physical Geography.

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Stage 1: Upper Level Setting

Ahrens. 2002. Meteorology 7ed.

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Stage 2: Cyclogenesis Location

Ahrens. 2002. Meteorology 7ed.

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Stage 2: Cyclogenesis

Aguado and Burt. 2000. Understanding Weather and Climate

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Stage 3: Open or Mature

Aguado and Burt. 2000. Understanding Weather and Climate

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Stage 3: Animation of Connection

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Stage 3: Upper Air Convergence and Divergence
Jetstream

McKnight and Hess. 2002. Physical Geography

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Stage 3: Temperatures around a Cyclone

Image from the University of Illinois WW2010 Project

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Stage 3: Wind and Pressure around a Cyclone

Aguado and Burt. 2000. Understanding Weather and Climate

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Stage 3: Cross-Section

McKnight and Hess. 2002. Physical Geography

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Stage 3: Clouds and Fronts

McKnight and Hess. 2002. Physical Geography

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Stage 3: Clouds and Mature Midlatitude Cyclone

Aguado and Burt. 2000. Understanding Weather and Climate

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Stage 3: Weather around a Cyclone

Image from the University of Illinois WW2010 Project

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Stage 3: Cyclone Basics and Fronts

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Stage 4: Occlusion

Aguado and Burt. Understanding Weather and Climate

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Stage 4: Cold Occluded Front (Map View)

Ahrens. 2002. Meteorology 7ed.

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Stage 4: Wave Cyclone and Jet Stream

Aguado and Burt. Understanding Weather and Climate

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Stage 4: Cold Occluded Front 1

Ahrens. 2002. Meteorology 7ed.

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Stage 4: Cold Occluded Front 2

Ahrens. 2002. Meteorology 7ed.

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Stage 4: Cold Occluded Front 3

Ahrens. 2002. Meteorology 7ed.

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Stage 4: Cold Occluded Front Animation

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Stage 5: Dissolving (Map View)

Ahrens. 2002. Meteorology 7ed.

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Stage 5: Three-Dimensional View

McKnight and Hess. 2002. Physical Geography

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Midlatitude Cyclone Animation

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Midlatitude Cyclone Movement • Cyclonic air movement

• Cold and Warm front movement
• Movement of Low • Movement of Rossby Wave

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Movement

http://www.atmos.uiuc.edu/~snodgrss/Midlatitude_cyclone_files/image018.jpg

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Global View of Midlatitude Cyclones

McKnight and Hess. 2002. Physical Geography

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Seasonal Storm Tracks

Christopherson. Geosystems.

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Actual Storm Tracks in March 1991

Christopherson. Geosystems.

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Midlatitude Cyclone: April 15, 1994

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Midlatitude Cyclone: April 16, 1994

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Midlatitude Cyclone: April 17, 1994

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Midlatitude Cyclone: April 18, 1994
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Review
• • • • • What are cyclones and anticyclones and what do all cyclones have in common? Where and why do midlatitude cyclones form? What are the weather characteristics along the polar front before cyclogenesis (Stage 1) occur and how do they contribute to cyclogenesis? What is the structure of the midlatitude cyclone during cyclogenesis (Stage 2)? What is the structure of the mature midlatitude cyclone (Stage 3) including the position and movement of fronts and the air masses involved? What is the link between upper ridges and troughs and the mature midlatitude cyclone (Stage 3)? What is the structure of the occlude midlatitude cyclone (Stage 4)? How and why do fronts change during the occluded stage? What is the structure of the midlatitude cyclone during the dissolving stage (Stage 5)? How do upper level winds, the jet stream, ridges, and troughs relate to the movement and development of midlatitude cyclones? How do the paths and the general characteristics of wave cyclone differ from summer to winter? 46

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M o v e m e n t

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E v o l u t i o

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