"Less than a day after the attack began, a sudden, very heavy thunderstorm—possibly a hurricane—put out the fires. It also spun off a tornado that passed through the center of the capital, setting down on Constitution Avenue and lifting two cannons before dropping them several yards away. Following the storm, the British returned to their ships, many of which required repairs due to the storm. The occupation of Washington lasted for roughly 26 hours and the British plans are still a subject of debate."

The Washington DC area gets only a few tornadoes per century.

https://en.wikipedia.org/wiki/Burning_of_Washington