The City of Huntington Beach tests it's Tsunami warning sirens on the last Friday of this month (Sept 29) at noon. The system consist of electronic speakers at the beachs and 6 Thunderbolts plus 1 2001 located at their fire stations. This is probably one of the few active systems in California using Thunderbolts.
Map
http://www.ci.huntington-beach.ca.us/Re ... /siren.jpg
Addresses
http://www.laokay.com/FireDepartment_oc ... ngtonBeach
(The Station at 19711 Bushard St has the 2001 so pick any other station if you're looking for a Thunderbolt)
The California Institution for Men will test it's 3 FS 2001 sirens on Friday October 6 arround 12 noon. Tests here can be up to 20 mins of attack signal and the sirens here are very low. Check out the one near Central and El-Prado road since it's the closest one you can get to. Another is visible on top of a guard tower on Central just slightly south of Ecualyptus if you're standing next to the prison's Substation. Be careful as prison personnel may become suspicious if you remain in the area for long periods of time or carry any recording device.
Finally, Southern California Edison's SONGS (San Onofre Nuclear Generating Station) will test it's sirens sometime in the middle of October. I don't have the exact date and time yet but I'll post it when I find out. Last system test was on October 26, 2005 with two alert signals for 3 mins from a period of 10AM to 12Noon. This maybe a good time to get a recording of those custom made sirens for this station which are located throughout San Clemente.
Map
http://ci.san-clemente.ca.us/sc/Inf/Map ... sirens.jpg
(Note: BIG Picture!)
I won't be able to record these tests due to classes but I'm hopeing any of you from/in my area will be able record or video tape one of these.[/img]