Tornadoes And Thunderstorms

1. Tornadoes And Thunderstorms BY Jeremy,Allistor, And Moe

2. Table of Contents How thunderstorms and tornadoes forms…………………Slide 3 What time of year thunderstorms and tornadoes occur……Slide 4 Areas of Tornadoes and Thunderstorms are most common……Slide 5 Tornadoes and Thunderstorms in our area………Slide 6 Recent Tornadoes and Thunderstorms…………..Slide 7 Potential destruction of Tornadoes and Thunderstorms..Slide 8 Frequency of Tornadoes and Thunderstorms……Slide 9 Factors of Tornadoes And Thunderstorms……Slide 10 Exciting details and facts about thunderstorms and tornadoes…….Slide 11

3. Formation of Thunderstorms and Tornadoes Before thunderstorms develop, a change in wind directions and an increase in wind speed with increasing height creates an invisible, horizontal spinning effect in the lower atmosphere.Rising air within the thunderstorm updraft tilts the rotating air from horizontal to vertical.An area of rotation, 2-6 miles wide, now extends through much of the storm. Most strong and violent tornadoes form within this area of strong rotation.A lower cloud base in the center of the photograph identifies an area of rotation known as a rotating wall cloud. This area is often nearly rain-free.Moments later a strong tornado develops in this area. Softball size hail and damaging "straight-line" winds also occurred with this storm.

4. time of year thunderstorms and tornadoes occur • Tornadoes and storms can occur any time of the year. Most tornadoes in the southern areas usually occur in May through March. But in the northern areas they occur more often in the summer. They usually occur between 3 and 9pm.

5. Areas were Tornadoes occur The conditions that lead to the formation of tornadoes are most often met in the central and southern U.S., where warm, humid air from the Gulf of Mexico collides with cool, dry air from the Rockies and Canada. This area, dubbed "tornado alley," extends roughly from the Rocky Mountains to the Appalachians, and from Iowa and Nebraska to the Gulf of Mexico. Tornadoes can also occur elsewhere, though, including all U.S. states, Europe, Asia, and Australia.

6. Tornadoes in our area Windsor, Ontario June 17, 1946. 17 dead, hundreds injured. The tornado that caused tons of damage and even tore apart our beloved Devonshire Mall. That was the worst tornado to ever hit Windsor, Ontario. Most people did not know that. In this project you will learn other very interesting facts about tornadoes and thunderstorms that most people didn’t know.

7. Examples or Ocurrencs 09 Jun 2004: In Noble Park/ Mulgrave tree damage, tiles off roofs, signs blown down and pergolas lifted next door late in the evening. From a damage assessment it is likely that a F1 tornado with winds of 115 to 150km/h occurred. The damage path was 3.2km long and from 50 to 200 meters wide. 21 Dec 2003: Just south of Inverleigh, 20km west of Geelong, there was severe wind damage to farm buildings and trees. A narrow damage path 30m wide and 1km long suggests a possible tornado. Damage includes steel girders 150mm thick being bent, concrete blocks 1m by 450cm blown up to 10m away and a trailer ripped from a tractor and deposited 10m away.

8. Potential destruction of Thunderstorms and Tornadoes The Fujita scale classifies tornadoes according to the damage they cause. Almost half of all tornadoes fall into the F1 or "moderate damage" category. These tornadoes reach speeds of 73-112 m.p.h. and can overturn automobiles and mobile homes, rip off the roofs of houses, and uproot trees. Only about 1 percent of tornadoes are classified as F5, causing "incredible damage." With wind speeds in excess of 261 m.p.h., these tornadoes are capable of lifting houses off their foundations and hurling them considerable distances.

9. Frequency of its Occurence • The typical thunderstorm is 15 mile in diameter and lasts an average of 30 minutes. • Nearly 1,800 thunderstorms are occurring at any moment around the world. That’s 16 million a year.

10. Factors that you need to know that will happen before a thunderstorm can occur. The normal factor is moisture in the lowest areas of the environment. The air above the areas has to cool constantly with height, so that adds up to 3 miles above the ground which is very cold. Lastly, there has to be a outflow boundary in the environment to push that moist air from the ground up to where the air around is cold.

11. Intresting Facts • Tornadoes are the most destructive of all weather related events. •       Tornadoes can reach heights of 60,000 feet. •          Winds inside a tornado can swirl at close to 300 mph. •          Most tornadoes occur between 3 p.m. and 7 p.m. •          About 800 tornadoes touch down in the United States each year. •          Half of all tornadoes occur during the spring months of April, May, and June.

12. Continuation of Facts •         Tornadoes stay on the ground for an average of four to five minutes; however, a tornado can touch down several times. •        Tornadoes can form in any state but they occur most frequently in Alabama, Arkansas, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Louisiana, Mississippi, Missouri, Nebraska, Oklahoma, South Dakota, and Texas.

13. Facts about Thunderstorms • At any given time there are an estimated 2000 thunderstorms in progress, mostly in     tropical and subtropical latitudes. • About 45,000 thunderstorms take place each day • Annually, The U.S. experiences about 100,000 thunderstorms. • About 16 million thunderstorms occur annually around the world! • The lightning from these storms strikes Earth about 100 times each second