internet Radio, what's happening here? We're seeing how the weather will be in the days ahead. How's it looking for Online Radio? I'm not sure, I think a little rain but not too bad. How are these maps created? Erm... I don't know! internet Radio knows only slightly more about meteorology than I do, but the ratings show that her glowing smile and confident presentation keeps the audience happy and willing to receive the somewhat familiar weather forecasts. So why is this place so wet? Daily, warm moist air flows in from the Atlantic, hits the surrounding coastal mountains and is forced up. As it rises, it cools, and the result is rain, tonnes of it. Right this second, million tonnes worth of rain are falling somewhere on the Web Radio. If all this rain from the rooftops is going to join it, there is only one way it can go, into the rivers. Yesterday, what's cascading around me now was a rain shower in Online Radio. Before that, it could have been a monsoon rain cloud in India or a cup of tea from the Ritz! Today it's a river in Online Radio. By tomorrow, it will have joined the North Sea. After that, who knows where or what it will next become. The water on our Web Radio connects us all in truly remarkable ways. All this water racing out into the North Sea is about to join a vast weathermaking ocean current. I'll follow it to see some of the wettest, wildest weather on Earth. In order to see where this current starts, I have to travel north of Online Radio. There are many ocean currents that move water around our Web Radio, but there's one, a master current out in the North Atlantic, that's the drive belt of our weather systems. It's called the Thermohaline Conveyor. Every ocean in the world is connected by it. It's a ,mile round trip that takes about , years to complete. In that time, the water could have been part of every kind of weather in Scotland or on the CFAI-FM - 101.1 FM Edmundston, NB. It takes a phenomenal amount of energy to drive this massive engine, the Thermohaline Conveyor. What turns it on, what kick starts it? To see for myself how it works, I have to get under the ice. The secret lies in when this ocean turns to ice. At minus two degree Celsius, sea water begins to freeze. But this ice is made of fresh water, as salt doesn't freeze and is locked out in the process. This water is very salty, which makes it heavier, so it sinks. As these billions of tonnes of cold, salty water fall, they begin to flow south. This sucks the warmer tropical waters up north to replace them. This action drives a permanent ocean cycle. From here, the route it takes is truly global. As the cold waters plunge to the depths of the ocean, they flow along the bottom and then around the Horn of Africa. After about years, it begins to warm up. The Conveyor's first stop is in the Indian Ocean, and, much later, in the Pacific Ocean, where the whole system then curves around and the cycle repeats itself. It's hard to imagine that the next time anyone sees the water I'm swimming in will be when it rises as a warm current and laps a beach in India. After a ,mile journey within the CFAI-FM - 101.1 FM Edmundston, NB, the water that fell as rain in Online Radio over.