The MET department may not be sure always. But, a the 29-year-old British woman always gets a migraine before the heavens open up. Bizarre it may appear, but Shakira Robson can predict when a downpour is on its way even without any technology. In fact, she can even tell how heavy the rainfall will be by the intensity of her headache. "It was a joke at first. I would text my friends and warn them to take an umbrella out with them as I was getting a migraine -- but when it was always correct, I thought I would monitor it. Now, I'm like a human barometer," she said.This may be due to the inability of the brain to adjust to a drop in air pressure. It is believed that such abilities were present since the dawn of man and they helped people predict the weather. such people would have got important positions in society.