the column weighs less and so the force it is exerting on the ground, the pressure, gets lower. hence, low pressure. nearthe ground, air rushes in to replace what is lost higher up, and the area of low pressure rotates more and more quickly. and as the process continues, the storm is able to deepen explosively. on a weather chart, you will see more and more isobars appearing, like a dartboard, and if the pressure falls by at least 2a millibars in 2a hours, that is explosive cyclogenesis, or a weather bomb. weather bombs like storm eunice are not that unusual. but it is when explosive cyclogenesis happens near land their impact can be extreme. eunice's winds were so strong they shredded part of the fabric roof of london's o2 arena, which opened as the millennium dome 22 years ago. dudley was the first of the three named storms to hit the uk injust one week in february. even a wind turbine