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A brief description of thunderstorms, what causes them and a few examples of thunderstorms which have occurred in different places

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  1. 1. PHYSICS CCE -Anushree K 7’A’
  2. 2. CONTENTS Introduction to Thunderstorms:1. What are thunderstorms?2. How they occur?3. Different types of thunderstorms4. Safety precautions Examples of thunderstorms:1. 2010 Eastern Indian States2. 1939 South California tropical storm
  3. 3. WHAT ARETHUNDERSTORMS?A thunderstorm is alsoknown as an electricalstorm, a lighteningstorm, thundershoweror simply a storm.Thunderstorms areusually accompaniedby strong winds, heavyrain andsometimes snow, sleet, hail or noprecipitation at all.
  4. 4. Thunderstorms result from the rapid upward movement of warm, moist air. They can occur inside warm, moist air masses and at fronts.As the warm, moist air moves upward, it cools, condenses, and forms cumulonimbus clouds that can reach heights of over 20 km. As the rising air reaches its dew point, water droplets and ice form and begin falling the long distance through the clouds towards the Earths surface.As the droplets fall, they collide with other droplets and become larger. The falling droplets create a downdraft of air that spreads out at the Earths surface and causes strong winds associated commonly with thunderstorms.
  5. 5. There are four types of thunderstorms:1. Single-cell2. Multicell cluster3. Multicell lines4. Supercells.Supercell thunderstorms are the strongest and the most associated with severe weather phenomena. Dry thunderstorms, with no precipitation, can cause the outbreak of wildfires with the heat generated from the cloud-to-ground lightning that accompanies them.
  6. 6. Preparedness Safety People should know the names of  Take action immediately upon local counties, cities, and hearing thunder. Anyone close towns, as these are how warnings enough to the storm to hear are described. thunder can be struck by lightning. Monitor forecasts and know  Avoid electrical whether thunderstorms are likely appliances, including corded in the area. telephones. Cordless and wireless Be alert for natural signs of an telephones are safe to use during a approaching storm. thunderstorm. Cancel or reschedule outdoor  Close and stay away from windows events (to avoid being caught and doors, as glass can become a outdoors when a storm hits). serious hazard in high wind. Avoid open areas like  Do not bathe or shower, as hilltops, fields, and beaches. plumbing conducts electricity.
  7. 7. 2010 EasternIndian StatesAt approximately 11pm local time, April13, 2010, a severestorm struck partsof Bangladesh and eastern India. Itlasted about 90minutes, with themost intense portionspanning 30–40minutes.
  8. 8. 2010 Eastern India States. As of April 16, more than 140 deaths have been reported. At least 91 people died in the Indian state of Bihar, 44 in West Bengal and 4 in Assam. In Bangladesh, five deaths and 200 injuries were reported. Most of the deaths were women and children crushed when their huts were destroyed. Over 91,000 dwellings were destroyed in India and several thousand in Bangladesh; approximately 300,000 dwellings were at least partially damaged. Nearly 500,000 people were left homeless or otherwise affected by the storm. Rescue efforts have been inhibited as many roads, were blocked by downed trees and telephone poles.Medical personnel and supplies were quickly rushed to the affected areas, and aid packages were announced. Aid workers began to distribute rice, dried fruits, water, and temporary tarpaulin shelters on April 15.
  9. 9. 1939 California tropical stormThe 1939Californiatropicalstorm, alsocalledthe 1939 LongBeach tropicalstorm, ElCordonazo, The Lash of St.Francis was atropicalcyclone thathit SouthernCalifornia inSeptember, 19
  10. 10. . Formerly a hurricane, it was the only tropical storm to make landfall in California in the twentieth century.The storm caused heavy rain in most parts of the country and also lead to floods. The flooding killed 45 in Southern California, although some of these may be attributable to the rain immediately before the tropical storm. At sea, 48 were killed. The tropical storm was credited with at least one beneficial effect: it ended a vicious heat wave that had lasted for over a week and killed at least ninety people. Out at sea, the Coast Guard and Navy conducted rescue operations, saving dozens of people. Schools were closed there as the wind had reached a mighty speed too.People were advised not to use electrical appliances, not to stay near water outside and to stay away from any glass item.
  11. 11. PICTURES OF THE THUNDERSTORMS2010 Eastern Indian States 1939 California tropical storm
  12. 12. SOURCEInformation: WikipediaPictures : Google images