Hanoi, April 10 -- Hanoi (VNS/VNA) - A prolonged spell of extreme heat is sweeping across much of Vietnam, with temperatures climbing above 40 degrees Celsius in parts of the central region and forecasters warning of heightened risks to public health, energy demand and wildfire outbreaks. The heatwave has been driven by a persistent low-pressure system over the country's west, combined with a strong foehn wind effect that has intensified conditions across the central provinces and cities in recent days, according to the National Centre for Hydro-Meteorological Forecasting. From April 6 to 8, temperatures from Nghe An to Quang Tri surged to around 40 degrees, with some localities exceeding 41 degrees. Tay Hieu ward in Nghe An recorded 41.9...