EAS328_Lect4_Sandy_Part1(2) - EAS 328 Natural Environmental...

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EAS 328: Natural Environmental Hazards Lecture Slides for Friday, Feb 19, 2016 Part 1: Atmospheric Physics of Sandy Outline: 1. Atmospheric Components of the Storm AnIcyclones (extratropical) Extratropical Cyclones Tropical Cyclones 2. Sandy vs. Irene: similariIes and differences
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Ingredients for a Superstorm: Tropical + Extratropical Circulation Systems Extratropical Cyclone Extratropical Anticyclone Tropical Cyclone
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Dates : Oct 22 – Oct 31, 2012 land fall: Oct 29, 8pm Path : North then West Progression based on storm naming convention of the National Hurricane Center 1. Tropical Depression 2. Tropical Storm 3. Hurricane 4. Post-tropical Cyclone (land fall) Progression based on storm naming by the media: Hurricane à Frankenstorm à Superstorm Sandy. credit: Applied Physics Lab at Johns Hopkins University Overview of Superstorm Sandy
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POLAR REGIONS EXTRATROPICS SUBTROPICS SUBTROPICS EXTRATROPICS POLAR REGIONS TROPICS Review: Regions of the Globe * Subtropical cyclones also exist, but we won’t study them in this class.
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I: Atmospheric Components of the Storm CYCLONES - Low surface pressure at center - Circulation: counter-clockwise in Northern Hemisphere - Generate ascending air masses ANTICYCLONES - High surface pressure at center - Circulation: clockwise in NH - Generate descending air masses *Southern Hemisphere: cyclones spin clockwise anticyclone spin counter clockwise L H
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A B A B X X L H X X Interpreting Pressure Contour Maps.
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I: Atmospheric Components of the Storm A. Extratropical Anticyclones (AKA: Blocking) What is the most common weather event associated with anticyclones? - semi-stationary - the anticyclone get stuck in one place. - can last 1 – 4 weeks. - occur in Summer or Winter. - associated with stagnant weather or clear skies. 1030 hPa 1020 hPa 1010 hPa “omega” block Over the past 50 years, anticyclones have received much less research attention than cyclones.
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