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The Hurricane Life Cycle

The Hurricane Life Cycle . Mark DeMaria NOAA/NESDIS Regional and Mesoscale Meteorology Branch Hurricanes: Science and Society Webinar February 28, 2012. Three Stages of the Hurricane Lifecycle . Genesis F ormation from a tropical disturbance Development

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The Hurricane Life Cycle

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  1. The Hurricane Life Cycle Mark DeMaria NOAA/NESDIS Regional and Mesoscale Meteorology Branch Hurricanes: Science and Society Webinar February 28, 2012

  2. Three Stages of the Hurricane Lifecycle • Genesis • Formation from a tropical disturbance • Development • Organization and increase in maximum wind • Decay • Decrease in maximum wind • Dissipation

  3. Composite Satellite Imagery of the Life Cycle of Hurricane Frances (2004)

  4. September Sea Surface Temperature

  5. Conditions Needed for Tropical Cyclone Formation • Warm sea surface temperature • Greater than ~ 26.5oC (80oF) • Non-zero Coriolis force • Off the equator • Pre-existing disturbance • Tropical wave • Frontal boundary • Low vertical wind shear • Atmospheric temperature and moisture profile that supports thunderstorms

  6. IR Imagery of the Formation of Hurricane Rina from a Tropical Wave

  7. Tropical Cyclone Development Stage

  8. IR Imagery of the Development of Hurricane Rina

  9. Tropical Cyclone Decay Stage • Three Mechanisms for Dissipation • Movement over land • Movement over cold water • Movement into region with high wind shear and dry atmosphere • Other scenario • Transition to mid-latitude cyclone • Alternate energy source from pre-existing temperature gradients • Transition from warm core to cold core

  10. IR Imagery of the Decay of Hurricane Rina

  11. Summary • Hurricane Lifecycle includes three stages • Genesis • Development • Decay • Formation requires several special conditions to occur simultaneously • Development stage involves positive feedback with energy exchange with the ocean • Decay can occur due to movement over land, cold water or in atmospheric regions not conducive to thunderstorms near the storm center

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