UK weather: Britons urged to brace for summer heatwave amid rare 'super El Nino' alert
The phenomenon is triggered when winds across the Pacific slow or change direction, altering the water currents across the ocean
The phenomenon is triggered when winds across the Pacific slow or change direction, altering the water currents across the ocean
Northern and northwestern regions will bear the brunt of the assault
Britain is currently being sandwiched between two weather systems