A sonic boom caused by two fighter jets which broke the sound barrier flying up from Portland, rumbles the whole City of Seattle today, being heard throughout Western Washington.
Some news reported that after the two F-15 jets were launched from the 142nd Air National Guard unit based in Portland, they rattled the Vancouver, WA area and some minutes later they were cleared to speed up to supersonic speed, breaking the no-fly rules during President Barack Obama’s visit in Seattle.
A Sonic Boom is an impulsive noise related with the shock waves …