Heat Wave 3 : A period of abnormally hot and/or unusually humid weather. Typically a heat wave lasts two or more days. The exact temperature criteria for what constitutes a heat wave vary by location.
The International Disaster Database (EM-DAT), The EM-DAT Glossary, Centre for Research on the Epidemiology of Disasters (CRED), School of Public Health, Universit catholique de Louvain, Brussels, Belgium 2009. http://www.emdat.be/glossary/9, (ND/ Gen - Brit) {855}