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Hi Geoff, jjj and All.
Having been in situations where high speed jet fighters are involved, I'd hate to be on the receiving end.
There is no noise to warn you as it approaches. The jet is on the target and the jet noise follows. Very hard to describe it to anyone who has not experienced it.
A car at 150 klms/hr is heard well before its near. A fighter jet at 0.9Mach and altitude 200m has passed, fired on the target and on its way when the engine noise arrives at your ears.
Re: Geoff's link, notice the pressure wave on the water. It is behind the jet.
Incredible things happen at those near sonic speeds.
Cheers Marty
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