Bangladesh Meteorological Department (BMD) on Sunday (April 28) morning extended the heat alert for three more days as the ongoing heatwave is expected to continue for the next 72 hours."Due to increasing moisture incursion, the discomfort may increase. The 72-hour heat alert started from today," according to the warning notice of the BMD. The heatwave have been continuing in the country since March 31. The met office predicted that heat wave may decrease from first week of May through heavy rainfall.