Sri Lanka: Heatwave to continue nationwide through at least April 3 /update 2

Forecast models indicate that a heatwave will persist nationwide through at least April 3. The Sri Lankan Department of Meteorology has issued an amber caution (second-lowest level on a four-tier scale) advisory for North-Western and Southern provinces, as well as Anuradhapura, Mannar, and Vavuniya districts due to the high heat index (the temperature felt on the human body due to relative humidity and maximum temperatures) forecast. Authorities could downgrade or expand warnings as the heatwave develops. The high temperatures are forecast to ease slightly March 28-29 before intensifying over northern Sri Lanka March 30-April 3.

Authorities have advised residents to limit strenuous outdoor activities, find shade, and stay hydrated. Officials also encourage residents to wear lightweight and white or light-colored clothing to minimize the possibility of heat stress.

The extended period of oppressive heat and dry conditions may produce ideal circumstances for wildfire growth throughout the region. Heatwaves also 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 during prolonged exposure to high temperatures. These health risks could also extend to relatively healthy individuals during significant heatwave events. In addition to significantly impacting athletes and those who work outdoors, high temperatures can cause problems for people using mass transit. The lack of air conditioning and cramped vehicles during rush hour may lead to the hospitalization of some passengers due to dehydration.

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 engines, 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.