1. TODAY’S VOCABULARY HURRICANE: Tropical storm with wind speeds in excess of 74 mph.

2. METEOROLOGY UNIT Violent Weather - Hurricanes

3. VIOLENT WEATHER….. http://video.nationalgeographic.com/video/101- videos/hurricanes-101 http://video.nationalgeographic.com/video/101- videos/hurricanes-101 http://video.nationalgeographic.com/video/101- videos/tornadoes-101 http://video.nationalgeographic.com/video/101- videos/tornadoes-101 http://video.nationalgeographic.com/video/101- videos/lightning http://video.nationalgeographic.com/video/101- videos/lightning

4. PARTS OF A HURRICANE Start off as a tropical storm off coast of Africa Named when winds >39 mph Hurricane when winds >74 mph

5. PARTS OF A TORNADO Funnel Cloud Center part sometimes called the ‘vortex’ Drops out of supercell thunderstorms

6. CLASSIFTYING HURRICANES Saffir Simpson Scale Category 1: Winds of 64-82 knots (74-95 mph) Very dangerous winds will produce some damage Category 2: Winds of 83-95 knots (96-110 mph) Extremely dangerous winds will cause extensive damage Category 3: Winds of 96-113 knots (111-129 mph) Devastating damage will occur Category 4: Winds of 114 to 135 knots (130-156 mph) Catastrophic damage will occur Category 5: Winds above 135 knots (157 mph) Catastrophic damage will occur

7. CLASSIFYING TORNADOES FUJITA SCALE F-0 40-72 mph, Light damage, chimney damage, tree branches broken F-1 73-112 mph, Moderate damage, mobile homes pushed off foundation or flipped over F-2 113-157 mph, Considerable damage, mobile homes demolished, trees uprooted F-3 158-205 mph, Severe damage, roofs and walls torn down, trains overturned, cars thrown around F-4 207-260 mph, Devastating damage, well-constructed walls leveled F-5 261-318 mph, Violent damage, homes lifted off foundation and carried considerable distances, autos thrown as far as 100 meters.

8. TORNADOES Small Forms over land Spring Lasts a few minutes Highest wind speeds – 300 mph ? Dies out F0 – F5 Damage from wind, hail HURRICANES Large Forms over tropical waters Late summer/fall Can last days Highest wind speeds --- 160 mph Dies out over land / cold water Category 1-5 Damage from wind, water (storm surge), can spawn tornadoes

9. More facts….. TORNADO Forms from supercell thunderstorms The greater the difference in air pressure between high and low and pressure air masses, the more likely a tornado will result Center is low pressure Circulate counter clockwise HURRICANE Ocean warmer than 26 o C Low pressure in center great enough, storm starts to spin into the center Circulate counter clockwise Dissipate over land and/or cold water

10. TODAY’S ACTIVITY TRACKING HURRICANES

11. TICKET OUT THE DOOR Hurricanes that hit the Southeast United States start …………………