Severe weather


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Severe weather

  1. 1. Thunderstorm • It begins to from when warm humid air moves upwards rapidly • The sun heats a place on Earth’s surface ,which , in ,turn , warms the air mass above it.
  2. 2. • Then a cold front may push under the warm air mass , or wind may force it upward. • The higher surrounding air is colder than the rising air mass. • As the warm air cools, the water vapor in it condenses into air droplets, which forms a cloud
  3. 3. • Soon the water droplets become heavy enough to fall as rain . • The falling rain pulls in cool air with it. • Winds blow both upward and downward in the cloud . • Negative electric charges build up in the bottom of the cloud.
  4. 4. • The charges travel through the air in a lightning discharge . • The air along the path of a lightning bolt extremely hot • The air along the path of a lightning bolt extremely hot • The intense heat makes the air expand so fast that sound waves are produced .
  5. 5. Tornado • It is a violently rotating column of air that extends downward from thunderclouds and touches the ground.
  6. 6. • A tornado starts when winds spin a column of air that bulges from the bottom of the cloud . • Strong updrafts ,or rising air ,are already present inside this bulge. • Next warm, humid air is pulled into the often funnelshaped column. • The air spins so fast that an area of very low pressure forms in the center.
  7. 7. • The swirling funnel starts to descend. • Because of the low pressure air in the near by area rushes into the funnel. • The air in the funnel rotates upward around the center, joining the storm above. • The wind speed in the tornado can reach 400km/hr or more.
  8. 8. • The force of the tornado ‘s winds destroy houses , cars and anything in its path.
  9. 9. Hurricane It is a large ,rotating tropical storm system with wind speeds of at least 119km/hr
  10. 10. What is a hurricane? A hurricane is a very destructive and dangerous storm. It forms in stages. The hurricanes are filled with rain, strong winds, lightning, thunder, hail and tornadoes. Stages of the hurricane : 1)Tropical depression 2)Tropical storm 3)Hurricane (wind speed 120km/hr)
  11. 11. What is eye of a hurricane? While some hurricanes, are small, others can be quite large. Hurricanes are mighty storms. In the center of a hurricane is an eye. Ironically, the eye is actually a calm area in a hurricane.