Describe and explain the changes in wind direction, atmospheric pressure, sky conditions (such as clouds and precipitation) and temperature with the passing of a cold front. 10. Describe the pressure patterns, wind patterns and the eye of a tropical cyclone (hurricane). 11. Why do hurricanes weaken when they move over land or over cool water? 12. Why are there no fronts within a tropical cyclone? 13. Why are tropical cyclones common along the east coasts of continents in the midlatitudes, but not along the west coasts? 14. What is a hurricane storm surge, and what causes one? 15. What is thunder? 16. Where do tornadoes occur globally?