The Israeli Air Force jets just caused a sonic boom over Gaza City (2:30pm).
A Sonic boom: "commonly used to refer to the shocks caused by thesupersonicflight of an aircraft. Sonic booms generate enormous amounts of sound energy, sounding much like anexplosion."
These are rather common; and a good way to scare people.
Rapid condensation of water vapor due to a sonic shock produced at sub-sonic speed creates a vapor cone (known as aPrandtl–Glauert singularity), which can be seen with thenaked eye.
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