Snow-struck America is about to sizzle in a freak February mini-heatwave fired up in the death throes of a powerful El-Nino. Above-average temperatures across swaths of the United States could hold out through spring, forecasters say. Northern and western regions are most likely to enjoy the warmth, with southern regions more at risk of staying cold–typical for an El-Nino year. The El-Nino event of 2023/24, confirmed last summer, rapidly strengthened through the end of last year prompting concerns of global weather impacts. The phenomenon, which alters climatic patterns around the world, happe…