NERJA was hit by a surprise onslaught of rain and hail yesterday which turned the streets into rivers.
In just 15 minutes, 15 litres of water per square metre fell onto the town.
In footage shared on social media, water can be seen gushing along the streets, carrying bins and benches.
The hardest hit areas were the streets surrounding the historic centre.
Dozens of businesses were flooded but there is thought to be no serious property damage.