Sudden Stratospheric Warming event

A Sudden Stratospheric Warming (SSW) event has taken place, resulting in the split of polar vortex in two vortices which may impact our weather later this month (there is a lag time between an SSW and the impact it has on UK weather).

A SSW of the atmosphere refers to a rapid rise in temperatures in the stratosphere (which is found at an altitude of 10 km to 50 km) when the temperature can rise by up to 50°C over a couple of days – and this often leads to cold conditions across the UK.