1. DO NOW When the bell rings, we’re going to be watching a clip from “Storm Chasers.” While you’re watching, think about what you already know about tornadoes. 1. Have you ever experienced a tornado? 2. Do you have family members who have? 3. What do you think about these guys? http://www.youtube.com/watch?v=06YyI7crOy0

2. Announcements  Happy Friday

4. Agenda  INM Tornadoes  Tuskaloosa Tornado  Check out

5. Tornadoes  Tornadoes form in unusually violent thunderstorms when there is sufficient  (1) instability and (2) wind shear present in the lower atmosphere.  Instability refers to unusually warm and humid conditions in the lower atmosphere, and possibly cooler than usual conditions in the upper atmosphere.  Wind shear in this case refers to the wind direction changing, and the wind speed increasing, with height.  IE: A southerly wind of 15 mph at the surface, changing to a southwesterly or westerly wind of 50 mph at 5,000 feet altitude.

6. Tornadoes  Tornadoes are caused by warm, moist air in advance of eastward-moving cold fronts  The intense spinning of a tornado is partly the result of the updrafts and downdrafts in the thunderstorm  http://www.mnn.com/earth-matters/translating- uncle-sam/stories/what-causes-tornadoes http://www.mnn.com/earth-matters/translating- uncle-sam/stories/what-causes-tornadoes

7. Tuskaloosa Tornado  http://www.youtube.com/watch?v=sA7TKSHJ_wM http://www.youtube.com/watch?v=sA7TKSHJ_wM

8. Tuskaloosa Personal Account