Ken, I wouldn't jump to the meteor conclusion too quickly without more info. Because the 'flash' and sound were close, whatever it was had to be right on top of you. We get similar experiences here regularly, with Air Force jets doing their terrain-hugging manoeuvres straight up the valley on their way over the mountains to the Sale base. Usually though, it's more a loud whine than a whoosh, but man, it's over in seconds leaving you wondering what the hell just happened!!! Because they're so low, "horizon-to-horizon noise" effectively spans just a mile or two. And at Mach speeds, that's not much time!
While some people claim to be able to hear meteors, I'm a bit sceptical because the 'noise' always seems to be concurrent with the meteor flash. I live under the Melbourne-Sydney flight path, and the sound for planes in the high slots can lag 20sec or more behind the visible jets. Meteorites I could understand if you were very close to the hit zone. Have you searched for eyewitness accounts of these? I would have thought that 2-sec travel overhead would be way too slow for a meteorite strike....?? Ie if it's close enough for the sound and flash to be concurrent, it'd be past you in a fraction of a second.
Hope you find out!
Cheers -
Rob