Geography, Disaster Management
✓Hurricane Laura, a Category 4 storm, made landfall in southwestern Louisiana with wind speeds reaching up to 250 km (150 miles) an hour. The US National Hurricane Center (NHC) warned of “life-threatening conditions”.
✓Hurricane Laura is a Category 4 storm, which means well-built framed houses can suffer severe damage with loss of most of the roof structure and exterior walls.
✓A Category 4 storm has wind speeds between 130-156 mph and can uproot trees and bring down power lines. The resulting power outages can last for weeks or months, rendering the area uninhabitable for weeks or months.
✓Tropical cyclones or hurricanes use warm, moist air as fuel, and therefore form over warm ocean waters near the equator.
✓ when the warm, moist air rises upward from the surface of the ocean, it creates an area of low air pressure below. When this happens, the air from the surrounding areas rushes to fill this place, eventually rising when it becomes warm and moist too.
✓When the warm air rises and cools off, the moisture forms clouds. This system of clouds and winds continues to grow and spin, fuelled by the ocean’s heat and the water that evaporates from its surface.
✓As such storm systems rotate faster and faster, an eye forms in the centre. Storms that form towards the north of the equator rotate counterclockwise, while those that form to the south spin clockwise because of the rotation of the Earth.
✓Depending on where they occur, hurricanes may be called typhoons or cyclones. As per NASA, the scientific name for all these kinds of storms is tropical cyclones.
✓The tropical cyclones that form over the Atlantic Ocean or the eastern Pacific Ocean are called hurricanes and the ones that form in the Northwest Pacific are called typhoons. ✓Tropical storms that form in the Bay of Bengal or the Arabian Sea are called cyclones.