Schematic representation of the Bikini Atoll (detonation of the nuclear device), the Rongelap Atoll and the possible positions of the Japanese fisherboat Lucky Dragon. The latitudes and longitudes for the centers of the two Atolls were read from google maps. For the possible positions of the Lucky Dragon, the information given by Oishi (2011) was used. The distances between the points were calculated using the internet calculator of the National Hurricane Center and Central Pacific Hurricane Center (n.d.). The wind direction from south-west (showed by the staff parts) to north-east (showed by the dot end) and its speed (one full barb: 10 knots) are given for a height of 10–12 km using the standard symbols on weather maps.