sound wave Friday, March 3, 2023 · 5:22 AM · ▾ ▶#Flaashback 30 years ago today.KYW Emergency Broadcast System test- March 3, 1993 (most) youtubeThis classic EBS test comes to you from channel 3 in Philadelphia. Missing last few seconds.unlikecommentstweet34 like this|211 saw this post