Just found out that University of Virginias siren system or (UVA), Tests there sirens whenever they feel like it. They test at 10:50 AM ET whenever day they test! You can just go to https://uvaemergency.virginia.edu/ and go to the mass notifacation plan, and it will say the next siren test. The next siren test as of 8/21/2022 is on August 30th
Signal: https://uvaemergency.virginia.edu/sirens
They start with voice, saying that they are testing, and then they do a hi-lo signal, concluding with more voice. Then they do an "All Clear Signal" or AirHorn tone on the sirens.