Bangladesh: Heatwave conditions forecast to persist over much of the country through at least May 18

High temperatures are forecast to persist across much of Bangladesh through at least May 18. The Bangladesh Meteorological Department issued a heatwave alert message the evening of May 15, advising that the prevailing heatwave over Barisal, Dhaka, Khulna, Rajshahi, and Rangpur divisions will continue over the next 48 hours. Levels of discomfort amid the heatwave may be exacerbated due to increased moisture incursion. A moderate heat wave of 38-40 C (100-104 F) is impacting the districts of Pabna, Dinajpur, Nilphamari, Kurigram, and Rangamati, while a mild heat wave of 36-38 C (97-100 F) is affecting most of the rest of the country. Forecast models indicate that the prevailing heatwave is likely to continue through at least May 18. At least ten people have died, and five others have been hospitalized across Bangladesh due to heatstroke since April 22.

The extended period of oppressive heat and dry conditions may produce ideal circumstances for wildfire growth throughout the region. Heatwaves pose a threat to vulnerable groups - such as the elderly, children, pregnant women, and those with respiratory illnesses - due to the increased possibility of heat stroke or heat exhaustion. Relatively healthy individuals, especially those working outdoors or using mass transit, may also face health risks during significant heatwaves. The lack of air conditioning and cramped vehicles, particularly during rush hour, may lead to dehydration and other health issues in some passengers. The extended period of oppressive heat and dry conditions may lead to wildfires.

Very high temperatures may warp rail tracks and force passenger and freight trains to operate at reduced speeds. Road surface damage is also possible, and overheated vehicles may worsen traffic problems in urban areas where congestion is already a problem. Commercial trucking disruptions might occur as very high temperatures put more stress on vehicles, making tire blowouts more common. Major flight disruptions are unlikely at airports in the region, but general aviation disruptions are possible, and some airfreight carriers could reduce cargo loads. High temperatures could lead to an increased demand for electricity, which might trigger localized brownouts or blackouts, exacerbating hazardous conditions when air conditioning is no longer possible.