Here's something I've never heard of before.
Storm Dennis, which is what is currently lashing its way outside my window, has been graded as a 'Bomb Cyclone'.
A quick look on Google state's that it is a storm that intensifies rapidly. They 'form when the air near the Earth's surface rises quickly in the atmosphere, triggering a sudden drop in barometric pressure'.
Does not seem good at all. The pictures in the news makes it look bad!