How to explain the appearance of this waterspout?
The phenomenon occurs when the weather conditions are unstable. There needs to be a big difference in temperature between the cold air at altitude and relatively warm sea water, at 16-17°C in the Bay of Audierne. To this combination are added swirling winds that go in all directions. Waterspouts form under storm clouds called cumulonimbus clouds. They only last a few minutes.
Are they predictable?
It’s difficult but in our weather report, we had announced that day a risk of a whirling phenomenon. This risk is also expected this Thursday, November 3 at the start of the day. The weather conditions will seriously deteriorate.
Is the phenomenon exceptional?
No, it is rather rare in Brittany but not exceptional. You can see them once or twice a year. These waterspouts are frequent in the Mediterranean area and particularly off Corsica.
Is the phenomenon dangerous?
It is above all spectacular. It is dangerous if the waterspout reaches land but it is not that frequent. At sea, the phenomenon is visible and moves rather slowly over a few hundred meters. But if one is caught in it, the chances of survival are limited.
Can we talk about a tornado?
It’s not nonsense, it’s a sort of water tornado, but the speed of the swirling winds still does not reach that of terrestrial tornadoes (more than 100 km/h against more than 300 km /h sometimes).
Is there a link with global warming?
Absolutely not. It is important to underline this.
letelegramme Fr Trans