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Most Hurricanes are Category 1-3 on the Saffir-Simpson scale.

Most Hurricanes are Category 1-3 on the Saffir-Simpson scale. Few are 4 & 5. 1900-2007 climatology. September is Hurricane Month. Global sea surface temperatures. T > 81 o F=27 °C for hurricane formation. North African dust storms can weaken a hurricane season.

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Most Hurricanes are Category 1-3 on the Saffir-Simpson scale.

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  1. Most Hurricanes are Category 1-3 on the Saffir-Simpson scale. Few are 4 & 5. 1900-2007 climatology.

  2. September is Hurricane Month.

  3. Global sea surface temperatures T > 81 oF=27 °C for hurricane formation

  4. North African dust storms can weaken a hurricane season.

  5. Warm enough ocean temperatures & large enough Coriolis force (Latitudes greater than 10 degrees)

  6. Vertical Wind Shear

  7. Vertical Wind Shear

  8. High Vertical Wind Shear: Destroys hurricane formation

  9. Low Vertical Wind Shear Enhances hurricane formation

  10. Stages in development Complexes of thunderstorms >64 knots 20-34 knots 35-63 knots Names are given to Tropical storms and Hurricanes

  11. Eye Wall Rain Bands Eye

  12. Katrina August 28, 2005 TRMM (Tropical Rainfall Measuring Mission)

  13. Surface Pressure lowest in eye and wind speeds highest in eye-wall

  14. Hurricanes are in the water near North America, Typhoons Near Eastern Asia, Cyclones everywhere else.

  15. Climatology

  16. El Nino and Hurricanes

  17. Red- tropical storms and hurricanes Yellow- hurricanes only Green- cat 3 or larger.

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