Ophelia was unusual because it travelled in a north-easterly direction across the Atlantic.

Ophelia was the most powerful storm ever to hit the whole country.

Hurricane Ophelia had weakened to a tropical storm by the time it hit Ireland.

The rise in seawater level during a storm is known as a tsunami.

The calm area at the centre of a hurricane is called the eye.

Hurricanes form over oceans where the water is at least 26°C and the air is moist.

A storm is classed as a hurricane if it has continuous wind speeds over 100kph.

Depending on where they occur, hurricanes are also known as cyclones or typhoons.

Hurricanes are the most powerful storms in Earth’s atmosphere.