1. SEVERE THUNDERSTORMS

2. ORDINARY (“AIR MASS”) THUNDERSTORM LIFE CYCLE

3. SEVERE THUNDERSTORM

6. SHELF CLOUD

8. ROLL CLOUD

9. SQUALL LINE THUNDERSTORM

10. SQUALL LINE

11. MESOSCALE CONVECTIVE COMPLEX

12. Derecho 1) Concentrated area of convectively induced wind damage/gusts greater than 50 knots (60 miles per hour) 2) The area must have a major axis length of 400 kilometers. 3) Wind reports should show a continuous and nonrandom pattern of occurrence. For instance, a swath of storms should consistently produce wind reports as the system moves to the east or southeast. 4) In the storm reported areas, at least three reports, separated by 64 km or more, should include wind gusts greater than 64 knots, or 74 mph. 5) Derechos are typically continuous and can sustain itself for hours. With that said, no more than three hours can elapse between successive wind damage eve

14. DRYLINE

15. (Eagleman, 206) cP cT mT

16. (Eagleman, 209)

17. THUNDERSTORM DAYS PER YEAR

18. HAIL DAYS PER YEAR

19. TORNADO!

22. VERTICAL WIND SHEAR AND VORTEX TUBE

25. TORNADIC THUNDERSTORM CHARACTERISTICS

26. Conservation of Angular Momentum angular momentum=mass x velocity x radius

28. April 3-4, 1974 Super Outbreak

29. # TORNADOES BY STATE PER YEAR (# TORNADOES PER 10,000 SQ. MILES PER YEAR) “Tornado Alley”

30. U.S. TORNADOES BY MONTH

31. JET STREAM AND TORNADO ACTIVITY Winter Jet Spring/Fall Jet Summer Jet

36. FUJITA TORNADO SCALE

37. ENHANCED FUJITA TORNADO SCALE

42. Sharknado