Fleet week in San Francisco
In September/October, Summer fog gives way to crisp blue skies in San Francisco. And Fleet Week comes to the city. The 'roaring' attraction of fleet week weekend is, the US Navy demo team, called Blue Angels, that put on an impressive display of precision flying over the city.
They 'shock-and-awe' people, scare the dogs and tick of the City Supervisors (see here and here):-)