People in parts of Hampshire have reported a loud thunder-clap and flash as snow and wintry showers began to fall earlier.
Paul in West End said the "massive bang" happened at about 06:30 GMT.
He said: "It was a lot louder than normal thunder. I thought it was an explosion or something."
BBC reporter Talia Slack said: "It knocked a vase of flowers over that was on my window ledge and a picture came off my bedroom wall. Never heard anything like it."
The thunder-clap was also reported in Winchester and Ashurst.
Met Office forecaster Simon Partridge said the phenomenon, known as thundersnow, was unusual.
He said: "Most thunderstorms are driven by warm air so you need an active frontal system with lots of energy to get it to happen in cold weather."
He said thundersnow was no louder than a normal thunder-clap and was often muffled by snowfall.
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By Thomas Mackintosh
BBC News, London