A method to analyse urban heatwaves. Case study - Bucharest City (Romania) Daniela-Elena Gogoașe-Nistoran, Daniel-Marian Antohe, Ioana Opriș and Cristina-Sorana Ionescu E3S Web Conf., 286 (2021) 04004 Published online: 12 July 2021 DOI: 10.1051/e3sconf/202128604004