[Dion]

Experts said the absence of a mayday call meant something happened very quickly.

"The conclusion to be drawn is that something catastrophic happened on board that has caused this airplane to ditch in a controlled or an uncontrolled fashion," Jane's Aviation analyst Chris Yates told The Associated Press. "Potentially it went down very quickly and so quickly that the pilot on board didn't have a chance to make that emergency call."

The plane "crossed through a thunderous zone with strong turbulence" at 0200 GMT Monday (10 p.m. EDT Sunday) and an automatic message was received fourteen minutes later reporting electrical failure and a loss of cabin pressure.

That was the last communication sent from the plane, when it was about 60 miles (100 kilometers) south of the Cape Verde Islands, according to the Brazilian Air Force.

"Tropical thunderstorms ... can tower up to 50,000 feet (15,240 meters). At the altitude it was flying, it's possible that the Air France plane flew directly into the most charged part of the storm — the top," Henry Margusity, senior meteorologist for AccuWeather.com, said in a statement.

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