The Omega block pattern takes its name from the Greek letter Ω: a bulge of warm, high-pressure air held between two pockets of cooler, low-pressure air. | World News

The temperature spike is being driven by a mass of hot air moving from the Sahara, fuelled by a high-pressure ‘African anticyclone’ system.

The spike in temperatures is being driven by a mass of hot air moving north from the Sahara, fuelled by a strong high-pressure system known as the ‘African anticyclone’.