On the night of 16–17 August 2010, two strong heat islands were forecast in the centre of Thessaloniki, Greece. These islands led to elevated temperatures in the centre of the city which, in turn, reduced the expected thermal comfort conditions. According to the forecasts, there was a small area within the urban centre where both temperature and risk were expected to be low: an open space area with abundant vegetation cover. This map shows the difference in air temperature (+/–°C) between the areas of the city.