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 influence of an Atlantic Ocean low-pressure system named Ulrike, resulting in unstable weather conditions throughout much of the UK, with significant instability in the south. At around 07:30 GMT, a cluster of thunderstorms formed over Cornwall and moved east-northeast across the country.