Tuesday Noon Siren

A siren sounds in my neighborhood every Tuesday at noon. Why it sounds has been a mystery during my time in law school - everyone knows about it and hears the siren each week, but all are too lazy to figure out what, exactly, the siren is for.

Well, C finally took a minute to hit up Google and was rewarded with the answer (via Yelp):

"Every Tuesday at noon, San Francisco tests the Outdoor Warning System. During the test the siren emits a 15 second alert tone. In an actual emergency, the siren tone will cycle repeatedly for 5 minutes. Should you hear the sirens at any time other than Tuesday at noon, go indoors and immediately tune to a news source such as KCBS 740 AM, or other local media stations."