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A thunderstorm is one of the more spectacular shows put on by nature. Its potential dangers to the mariner are its sometimes torrential rain, which may reduce visibility to zero; sudden squalls of wind; risk it poses of interference with radio communications known as 'atmospherics' or 'static'; and the possibility of damage to magnetic compasses if the ship is struck by lightning. The causes of a thunderstorm's formation are such that, in general, it is more violent when the weather is relatively warm and humid. In the Mediterranean, for example, a violent thunderstorm may last for an hour or two. This can create serious difficulties for any ship trying to enter a harbour and is quite dangerous to a small vessel, especially if she is under sail. In temperate zones, thunderstorms may occur at any time of the year during the passage of a cold front, due to cold air undercutting warmer air, but that tends to be a squally occasion in any case.