The met office has issued a new yellow alert valid from 1pm to 4pm on Friday.

Forecasters said temperatures overnight on Thursday would be around 19C inland and 23C on the coast. On Friday the temperature is expected to be 40C inland and 32C in the higher mountains.

The high temperatures will continue into Saturday but at noon and in the afternoon, there will be increased clouds, in the mountains or inland.

At the same time, the forestry department issued a red alert for fires on Friday as temperatures in the island are set to be extremely high.

The department urged the public to be careful during their activities outdoors and avoid actions and activities that are likely to cause a fire, such as the use of tools or agricultural machinery producing, sparks or flames.

People who have electric generators or water pumps located in the countryside should also take the necessary precautions to prevent the possibility of fire.

Furthermore, the statement reminded that the fine for those who start a fire without a licence amount to up to 10 years in prison or €50,000 or both sentences combined according to the forest law of 2012, and up to five years in jail or €20,000 according to the Prevention of Fires in the Rural Areas Act 1988.

Lighting fires to cook food is only permitted in designated picnic or barbecue areas, the Forestry Department added.

Anyone who spots smoke or fire in or near the forest should contact 1407 (Forest Department) or 112 (Fire Department).