Is it raining or the clouds sucking up moisture from the sea?

While on our way from Calcata to Lido di Tarquinia, I spotted out this amazing sight. Probably not as impressive in the pictures, but I was definitely stupefied.

It looks as if it is raining heavily in one spot. Poor things caught in it must not have had a pleasant day. in fact, parts of Rome got flooded during the weekend.

At the same time though, it looks so cool. As if the clouds are sucking in moisture from the sea. It looked like an alien movie somewhat.