Orissa continues to reel under heatwave conditions even as the death toll due to sun stroke in the state mounted to 51 on Thursday. Seven deaths were reported from Dhenkanal, six each from Angul and Jagatsinghpur, five from Khurda, four each from Ganjam, Nayagarh, Sambalpur and Sundergarh, two each from Balasore, Puri and Sonepur, three in Jajpur and one from Kendrapara and Mayurbhanj districts.