Local newspapers have described the weather as a tornado and a waterspout, which is a tornado above water.
The pressure of high winds on the mast could have helped tip the boat over in rough seas, experts have suggested.
Mr Sharpe said capsizing seemed “unlikely” to him given the Bayesian’s size “and that boats like that are designed to survive poor weather – unless something failed at the same time like a valve that let water in and made the whole boat unstable”.
He said it was more likely that the Bayesian had “dragged anchor”. Anchors are designed to lodge on rocks on the seabed, but if the seabed is too soft, or weather is so bad that the anchor is dislodged, then a boat can drag its anchor and drift.
If a boat drifts into an obstruction such as a rock or another boat, this can damage the boat by tearing a hole in its side leading to sinking, Mr Sharpe suggested.
The sea bed off Porticello, the Silician harbour nearest to where Bayesian was moored for the night, consists of a mixture of rocky and muddy areas, according to nautical charts reviewed by The Telegraph.
This means the yacht could have dragged anchor if it had been lowered into a soft, muddy patch of seabed.
A captain of another boat anchored nearby said his vessel was hit by abnormally strong winds on Monday morning.
Karsten Borner said the Sir Robert BP was battered by very strong gusts in the early hours of the morning but he managed to stabilise the vessel while anchored by using the engine.
He said as they were doing this, they noticed the Bayesian nearby and manoeuvred to avoid hitting it.
“We managed to keep the ship in position, and after the storm was over, we noticed that the ship behind us was gone,” said Capt Borner.
Mr Sharpe said: “From a seamanship point of view, the other boat (Sir Robert BP) coming up on her main engines and using those to keep position around [her own] anchor is what you should do. Yacht anchors are often not that robust and that is the best way to avoid putting too much strain on it and/or dragging.”
An alternative theory is that the weight of the mast led the Bayesian to capsize.
A yacht industry source told The Times that the vessel sank after the weight of her mast took the hull beyond its “down-flooding angle” – the point at which a boat cannot right itself after swinging at a steep angle – meaning water rushed over the sides into the interior.
“The wind toppled the mast, which fell over the side, causing the boat to heel over and take on water, capsize and sink very quickly,” the source said.
This can occur whether the mast snapped off or not.
Sam Jefferson, editor of Sailing Today, told The Telegraph: “She has a very tall, aluminium mast – I believe it is the second tallest aluminium mast in the world – and that would not have helped.