On the morning of 7 December, the UK was under the influence of a strong Atlantic Ocean low pressure system, which was named Ulrike, bringing unstable weather conditions to much of the UK, and the south in particular. At approximately 07:30 GMT, a small band of thunderstorms initialised over Cornwall moving east-northeast across the country.
On December 7th, the UK was under the sway of an intense Atlantic Ocean low-pressure system called Ulrike, which brought unsettled weather conditions to much of the UK, with particularly unstable conditions in the south. At approximately 07:30 GMT, a group of thunderstorms developed over Cornwall and moved east-northeast across the nation.