In 2005, a powerful hurricane called Hurricane Katrina struck the southern United States. The coastal city of New Orleans was badly flooded. It was the most destructive storm that has ever hit the United States.
Another new Malaysia’s book of record. 732 Santa Claus & Santarina joined Christmas treasure hunt at Spritzer Eco Park. Well done to the organiser who helped to promote Taiping, our own heritage city. 🎄🎄
Hurricane Katrina wrecked seaside towns when it blew in off the ocean. Powerful winds tossed this truck into a tree. Boats were sucked out of the sea and hurled onto the shore.
Roaring winds, rough seas and heavy rain caused flooding. The Mississippi River spilled over high banks called levees that had been built to prevent flooding. Water poured into the nearby city of New Orleans.
City leaders ordered everyone to leave New Orleans. Helicopters and boats rescued people who had been stranded in their homes by the rising floodwater.
When the water finally drained away, the levees were rebuilt. Damaged buildings then had to be repaired. It was a long time before it was safe for people to return to their homes.
* Winds of up to 280 kilometres per hour were recorded during Hurricane Katrina
* Floodwater covered four-fifths of New Orleans. Homes, shops and parks were covered by up to six metres of water.
In 1974, a total of 148 tornadoes formed in s single day. The funnels swept across 13 US states. They killed 330 people and left a path of devastation 4000 kilometres long!
When a tornado strikes, the safest place to be is underground. Many homes in the USA have underground shelters in basement and cellars. People hide if they are told a tornado is due and come out when the danger has passed.
The funnel of a tornado acts like a giant vacuum cleaner. It can suck roofs off houses and flatten buildings. It can pick up cars like toys and toss them into the air.
Did you know, tornadoes have been known to pick up very heavy objects. In 1931, a tornado lifted a train weighing 80 tonnes whirled it through the air and threw it into a ditch.
Most people will do anything to avoid a tornado. But experts called storm chasers enjoy watching tornadoes up close. When a tornado is reported they race to the scene to photograph the storm.
Swirling air in thunderclouds make raindrops rub together. This produces tiny electric charges. Positive charges build up at the top of the cloud, negative charges build up at the bottom. Lightning sparks between the two.
The type of electricity that builds up inside thunderclouds is called static electricity. This is the same kind of electricity that makes your hair stand on the end if you brush it hard!
As lightning streaks through the sky, it heats the air to incredibly hot temperatures. The air explodes, causing a deafening crack of thunder. Light travels faster than sound., so you see the lightning before you hear the thunder.
Did you know, the sound of thunder takes three seconds to travel one kilometre. You can tell how far away a storm is by counting the seconds between the lightning and thunder and dividing the number by three.
Lightning can start forest fires, especially in dry weather. In 1988, fires caused by lightning raged through Yellowstone National Park in the United States. Many thousands of acres of forest were burned.
Swirling snow fills the air during a blizzard, and a layer of ice makes roads slippery. Roads can be blocked by the heavy snow.
Hailstones form when winds toss ice crystals up and down inside cold clouds. As the ice crystals rise and fall, more layers of ice are added, forming pellets of ice called hailstones. These hailstones eventually get so heavy they fall to the ground.
Large hailstones do a lot of damage. Hailstones the size of baseballs can dent a car roofs and smash windscreens. They can also flatten crops.
Car journeys cause a lot of pollution. We can produce far less pollution by choosing different ways to travel. People should try to walk, cycle or take the train or bus to work or school.
If sea levels carry on rising, cities by the coast could flood, Beautiful islands like this could disappear altogether. We need to produce less pollution to stop this happening.
Waste paper, glass, metal and plastic can be collected and sent to factories to be made into new materials. This is called recycling and helps to save energy.
Power stations that provide us with electricity are adding to global warming. We can help by using energy more carefully. People should switch off lights, Tvs and computers when they are not using them.