The accident at the Chernobyl nuclear power plant in the Soviet Union on 26 April 1986 is one of the defining moments of the nuclear age. It is the worst nuclear accident ever: a melt-down of the core of a reactor, followed by an explosion and fire releasing tons of radioactive debris into the atmosphere. The accident not only killed nuclear workers and firemen who fought to save the doomed reactor, but also condemned many others who lived under the path of the fallout to illness and premature death or a life of waiting for a hidden enemy. The weather, no respecter of nation states, carried its deadly passenger far and wide.

Fallout over Britain

At first, Britain seemed likely to escape as its predominant weather pattern comes from the west. Traditional British scepticism about weather forecasts was confirmed, however, when six days after the accident, torrential rain and thunderstorms over mountains and uplands deposited a charge of radioactive material. The Chernobyl cloud had undergone a 4,000 kilometre journey with virtually no precipitation until it reached Britain.