I was searching for any Fresno topics but came up dry so ill talk about it here. Now for context the Fresno system is made up of entirely SD-10s (I have not found any evidence of other models in the city). and was installed in the cold war. one is located on the roof of some sort of city building in downtown, another by some railroad tracks (I don't know EXACTLY where), and 2 are at the airport. Now in some point between now and the 80s antennas were installed onto them this is where things get confusing. because after this small upgrade they never test not even yearly. Fresno is not located near a cost or has tornados just the occasional thunderstorm. so is the system active to warn of bad weather? or was it given a small upgrade for nothing? there is just not enough info to confirm. all I know is that there there and they are presumably active.
Ill include a image of one of the sirens down below: