Severe Weather: Tornadoes and Hurricanes

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1 Severe Weather: Tornadoes and Hurricanes

2 Tornadoes

3 Grab Toto!! TORNADOES Are a low pressure storm that usually forms over land in an average year, 800 tornadoes are reported in the U.S. a tornado is defined as a violently rotating column of air extending from a thunderstorm to the ground the rotating column of air is called the vortex the vortex is only visible when debris and dirt gets carried up with the winds THE HOOK

4 Where do they come from? Tornadoes come from the energy released in a thunderstorm. What makes them dangerous (as compared to hurricanes) is that their energy is concentrated in a small area, only a hundred yards across

5 Most common east of the Rocky Mountains and west of the Appalachian Mountains. They occur mostly during the spring and summer (AprilJune) They usually occur during the late afternoon and early evening. Usually happen along cold fronts When & Where do they occur?

6 How long is a tornado usually on the ground? Can range from a few seconds to several hours... 5 minutes is average How fast do tornadoes move? Movement can range from virtually stationary to more than 60 miles per hour... Average is miles per hour.

7

8 Watch means conditions are favorable for tornado to develop Warning means that tornado has been spotted

9 THE WIND! Take a look at this piece of wood that was driven into the palm tree.

10 LOOK AT THESE

11 MEASURING DESTRUCTION The Enhanced Fujita Scale rates tornadoes based on the amount and type of wind damage produced.

12 EF-0. Light damage Wind 65 to 85 mph. Causes some damage to siding and shingles

13 EF-1. Moderate damage Wind 86 to 110 mph. Considerable roof damage. Winds can uproot trees and overturn single-wide mobile homes. Flagpoles bend.

14 EF-2. Considerable damage Wind 111 to 135 mph. Most single-wide mobile homes destroyed. Permanent homes can shift off foundation. Flagpoles collapse. Softwood trees debarked.

15 EF-3. Severe damage Wind 136 to 165 mph. Hardwood trees debarked. All but small portions of houses destroyed.

16 EF-4. Devastating damage Wind 166 to 200 mph. Complete destruction of wellbuilt residences and large sections of school buildings

17 EF-5. Incredible damage. Wind +200 mph. Significant structural deformation of mid- and high rise buildings. Strong frame houses leveled off foundations and swept away; automobile-sized missiles fly through the air in excess of 100 yards May 25th, 2008 Catastrophic damage was reported in Parkersburg as much of the town was destroyed, with reports of flattened houses and debarked trees. Six people were killed in Parkersburg and at least two fatalities were reported where a housing development was destroyed. At least 70 people were injured

18 At 9:45 p.m. on May 4, 2007, Greensburg was hit by an EF5 tornado. The tornado was estimated to be 1.7 miles (2.7 km) in width and traveled for nearly 22 miles (35 km). Ninety-five percent of the city was confirmed to be destroyed, with the other five percent being severely damaged. The National Weather Service estimated winds of the tornado to reach 205 mph (330 km/h). This was the first tornado to ever be rated EF5 since the update of the Fujita scale.

19 Hurricanes

20 HURRICANES Low pressure systems that form over warm, tropical waters near the equator Most form between 5 and 20 degrees north latitude they almost never form in the South Atlantic

21 Different names are given to hurricanes depending on where they form 1. Atlantic we call them hurricanes 2. Pacific they are called typhoons 3. Indian Ocean they are called cyclones

22 Mature hurricanes average about 350 miles across They have the lowest barometric pressures ever recorded with any storm (905 millibars is lowest recorded) These huge air pressure differences is what creates the rapid, inward spiraling of winds

23 HURRICANE DEVELOPMENT When winds have developed speeds from 39 to 73 miles per hour, it is called a tropical storm (storms are given names when they begin to have winds of this speed) Katrina Developing

24 The storm becomes a hurricane when it reaches a wind speed of over 74 mph Hurricane Formation

25 When a season is very active, Greek letters are used to name tropical storms after the letters of the alphabet had been used.

26 THE END OF A HURRICANE When a hurricane travels over land or cold water, its energy source (warm water) is gone and the storm weakens, quickly dying.

27 HURRICANE SEASON Occurs from June through November Most hurricanes form during the late summer months because the ocean is still retaining heat from the warmer earlier months

28 MEASURING DESTRUCTION We use the Saffir-Simpson scale to rank hurricane intensities Saffir-Simpson Scale CATEGORY WIND SPEED STORM SURGE mph 4-5 feet mph 6-8 feet mph 9-12 feet mph Greater than Greater than Video Clip on Wind Tunnel DAMAGE Minimal Moderate Extensive Extreme Catastrophic

29 STORM SURGE ACCOUNTS FOR 90% OF HURRICANE-CAUSED DEATHS

30 Category 5 Status includes: Hurricane Wilma (October 2005) -- Gulf of Mexico, Yucatan Peninsula, Mexico, Cuba, and Southern Florida Hurricane Rita (September 2005) -- hit Texas, Louisiana Hurricane Katrina (August 2005) -- hit southern Louisiana, Mississippi and Alabama Hurricane Isabel (September 2003) -- hit North Carolina, Maryland, Delaware, Virginia, and Washington, D.C. Hurricane Andrew (August 1992)-- hit southeastern Florida and southeastern Louisiana Hurricane Camille (August 1969) -- hit Mississippi, SE Louisiana, and Virginia

31 AMAZING EARTH SCIENCE FACTS High pressure systems move clockwise and outward Low pressure systems (ex. hurricanes) move counterclockwise and inward.

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