1. Thunderstorms Chap. 13 Thunderstorms Severe Weather Tropical Storms Recurring Weather

2. Thunderstorms

3. The End

4. Severe Weather

5. The End

6. Tropical Storms This image shows damage done by hurricane Lili in 2002

7. I. Tropical Cyclones

8. A.Energy comes from warm ocean waters

9. I. Tropical Cyclones A.Energy comes from warm ocean waters B.Area of low pressure forms as a result of instability

10. I. Tropical Cyclones C.Coriolis effect moves air counterclockwise (in N. hemisphere)

11. I. Tropical Cyclones C.Coriolis effect moves air counterclockwise (in N. hemisphere) D.Names

12. I. Tropical Cyclones C.Coriolis effect moves air counterclockwise (in N. hemisphere) D.Names 1.Typhoons (in western Pacific Ocean)

13. I. Tropical Cyclones C.Coriolis effect moves air counterclockwise (in N. hemisphere) D.Names 1.Typhoons (in western Pacific Ocean) 2.Cyclones (Indian ocean)

14. I. Tropical Cyclones C.Coriolis effect moves air counterclockwise (in N. hemisphere) D.Names 1.Typhoons (in western Pacific Ocean) 2.Cyclones (Indian ocean) 3.Hurricanes

15. I. Tropical Cyclones E.Paths of a storm

16. II. Hurricanes

17. A.Parts II. Hurricanes

18. A.Parts 1.Eye Center of hurricane, characterized by calm winds and low pressure II. Hurricanes

19. A.Parts 1.Eye 2.Eyewall Band immediately surrounding eye, where strongest winds are found. II. Hurricanes

20. A.Parts B.Stages II. Hurricanes

21. A.Parts B.Stages Tropical Depression 38 mph II. Hurricanes

22. A.Parts B.Stages Tropical Depression Tropical Storm 38 mph 39-73 mph II. Hurricanes

23. A.Parts B.Stages Tropical Depression Tropical Storm Hurricane 38 mph 39-73 mph 74- mph II. Hurricanes

24. A.Parts B.Stages C.Categories Use the Saffir-Simpson scale II. Hurricanes

25. Saffir-Simpson Hurricane Scale Category Sustained Winds Damage 174-95 mph Minimal

26. Saffir-Simpson Hurricane Scale Category Sustained Winds Damage 174-95 mph Minimal 296-110 mphModerate

27. Saffir-Simpson Hurricane Scale Category Sustained Winds Damage 174-95 mph Minimal 296-110 mphModerate 3111-130 mphExtensive

28. Saffir-Simpson Hurricane Scale Category Sustained Winds Damage 174-95 mph Minimal 296-110 mphModerate 3111-130 mphExtensive 4131-155 mphExtreme

29. Saffir-Simpson Hurricane Scale Category Sustained Winds Damage 174-95 mph Minimal 296-110 mphModerate 3111-130 mphExtensive 4131-155 mphExtreme 5>155 mphCatastrophic

30. II. Hurricanes D.Hazards A ‘mound’ of water driven to shore by hurricane winds (up to 18 ft above normal level) 1.Storm surges

31. II. Hurricanes D.Hazards Can cause flooding 1.Storm surges 2.Rains

32. II. Hurricanes D.Hazards Can cause severe structural damage. 1.Storm surges 2.Rains 3.Winds

33. The End

34. Recurring Weather

35. I. Floods and Droughts

36. A.Floods Occur when more water falls than can infiltrate or runoff an area.

37. I. Floods and Droughts A.Floods 1.Flash floods can develop within minutes or hours of rain.

38. I. Floods and Droughts A.Floods 1.Flash floods can develop within minutes or hours of rain. 2.Almost half of flood fatalities are vehicle related.

39. I. Floods and Droughts A.Floods 1.Flash floods can develop within minutes or hours of rain. 2.Almost half of flood fatalities are vehicle related. 3.Six inches of fast moving water can knock you off your feet.

40. I. Floods and Droughts B.Droughts Extended periods of less than normal rainfall.

41. I. Floods and Droughts High pressure system with no jet stream activity B.Droughts 1.Causes

42. I. Floods and Droughts 1.Causes 2.Effects Affects agriculture, livestock, & people. B.Droughts

43. II. Temperature conditions Extended periods of above-normal temperatures A.Heat waves

44. II. Temperature conditions 1.Causes Caused by high pressure system – sinking air warms as it’s compressed and blocks cooler air. A.Heat waves

45. II. Temperature conditions 1.Causes 2.Humidity adds to discomfort Moisture in the atmosphere decreases evaporation of sweat from your skin. A.Heat waves

46. II. Temperature conditions 1.Causes 2.Humidity adds to discomfort 3.Heat index A.Heat waves Table used to determine apparent temperature

47. Heat Index

48. II. Temperature conditions B.Cold waves Extended period of colder than normal temps.

49. II. Temperature conditions 1.Causes B.Cold waves Caused by high pressure polar or arctic air

50. II. Temperature conditions 1.Causes 2.Jet stream keeps these air masses moving. B.Cold waves

51. II. Temperature conditions 1.Causes 2.Jet stream keeps these air masses moving. 3.Wind enhances the cold sensation. B.Cold waves The wind chill factor estimates the heat lost by human skin due to cold and wind.

52. The End