Almost 10 years ago, a well-experienced friend of mine flew a well-equipped Cessna 421 into a squall line. The airplane did not break up in the air; instead, he lost control and went straight in vertically. The impact crater was in the shape and size of the front of the airplane. The NTSB confirmed the whole plane was there by weighing the mostly unidentifiable bits that resulted.
Our takeaway is not to mess with squall lines. Oh, and squall lines contain thunderstorms. Avoid them, too. And, yup, thunderstorms contain lightning. Best to go around that as well.
