Why meteorologists are comparing Storm Éowyn to a bomb

By Suzanne Gray, Professor of Meteorology, University of Reading
Ambrogio Volonté, Senior Research Fellow in Meteorology, University of Reading

Storm Éowyn has unleashed strong and damaging winds over the British Isles, and particularly over Ireland and Scotland.

Air pressure at the centre of the storm plummeted 50 millibars in the 24 hours leading up to midnight on January 24. That’s more than twice what is required in the definition of “explosive cyclogenesis”, in other words, the development of a cyclonic (anticlockwise rotating) storm that is both rapid and severe – like a bomb going off. As a result, Éowyn can be termed a “bomb cyclone”.

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