Meteorology Climatology and Geophysics Board (BMKG) warns Seribu Islands fishermen to be aware of waterspout to occur in rainy season. This phenomenon usually happens in season transition period, but it can not be detected early.

This phenomenon can not be predicted specifically, we can only predict between 30-60 minutes before it happened

"This phenomenon can not be predicted specifically, we can only predict between 30-60 minutes before it happens ," said Hary Tirto Djatmiko, Head Division of BMKG's Public Relation, Monday (10/23).

According to him, people who want to sail should monitor its indications. Usually, one day before waterspout happened, humid air is typically felt from night to morning. 

Then around 10 AM, cumulus clouds can be seen. One of the clouds has a gray clear border rises up high like a cauliflower.

The cloud will quickly change into dark gray or black color, which usually called as cumulonimbus. "If there are similar signs, then it is 50 percent chance of occurrence," he said.

On Monday morning, Hilmansyah (23), Tidung Island resident said, he wanted to go to Kelapa Island from Tidung Island by boat. But suddenly around 9 AM, waterspout was seen from Semak Daun Island.

"Distance between waterspout and boat is around two kilometers. We are panic and boat is spinning. But thank God, we can reach to the shore," he closed.