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

3. September is Hurricane Month.

4. Global sea surface temperatures T > 81 o F=27 °C for hurricane formation

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

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

8. Vertical Wind Shear

10. High Vertical Wind Shear: Destroys hurricane formation

11. Low Vertical Wind Shear Enhances hurricane formation

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

13. Eye Eye Wall Rain Bands

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

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

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

25. Climatology

34. El Nino and Hurricanes

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