sounds to me like the plane disintegrated in mid-air
they hit really bad turbolence which are common in thunderstorms, not a little chop, think turbulence so strong that if you were not using your seatbelt, you would be mashed potatoes by being bounced around inside the cabin. these planes can withstand very high G forces, more than you would want to experience but there is a possibility the turbulence was so heavy that the plane just fell apart.
planes have very reliable radar onboard which directs them around the "cells" however there was a report of an electrical failure so if no electrical system, then no radar and then no circumnavigating a "dangerous" cell..
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