Mystery boom in North Delridge

4:30 PM: SPD and SFD are checking out multiple reports of what sounded like an explosion near Delridge Community Center/Playfield. So far, though, they haven’t found anything.

4:37 PM: SFD has closed the call.

27 Replies to "Mystery boom in North Delridge"

  • Alisha December 31, 2020 (4:34 pm)

    I was checking for this update, we heard this very loudly from Avalon.

  • Fred December 31, 2020 (4:50 pm)

    It was loud over here near the West Seattle High School. Freaked out me and the dogs. 

  • Jena C December 31, 2020 (4:56 pm)

    I live up the street towards Avalon from the Delridge Community Center. It sounded like a bomb went off. I felt my house vibrate. Maybe two weeks ago same thing but not quite as loud was car backfiring. 

    • Delridge December 31, 2020 (9:29 pm)

      Oh gosh, that happened right in front of my house! I was watching it outside. It sounded like an explosion going off back to back. The car was struggling to get up a hill. 

  • wsres December 31, 2020 (5:21 pm)

    5:20pm: do all the sirens near the alaska junction have anything to do with this?

    • WSB December 31, 2020 (6:42 pm)

      There was a call on Alki that briefly drew more than a few police, as well as a medical response. We checked it out. Did not turn out to be anything of note.

  • Phillip Ratliff December 31, 2020 (5:21 pm)

    That car was hilarious. I’m across the street from it – no idea what he was doing to that poor car but it was backfires for days. Probably destroyed it in the process. 

  • BigPhil December 31, 2020 (5:22 pm)

    That backfiring car was hilarious. No idea what that guy was doing to the poor car, but backfires for days. Probably destroyed it in the process. Also heard the boom today. Perhaps early NYE revelry.

  • Fred December 31, 2020 (5:34 pm)

    What does it mean when SPD closes the call? 

    • WSB December 31, 2020 (5:38 pm)

      It’s SFD who closed it – means their involvement, whether investigative or actively dealing with something, is over. In this case, it means nothing was found – they were dispatched to investigate just in case. I don’t know if any police are still checking it out – they don’t have a comparable real-time log.

  • ARPigeonPoint December 31, 2020 (5:36 pm)

    I just assumed it was Nucor. There have been a few big booms lately. 

    • Pdxmark77 December 31, 2020 (11:04 pm)

      I live 1 block from the plant and it did not sound like it came from that direction.    Besides, I have never heard a boom coming from there that would shake my house like it did this afternoon.

      • ARPigeonPoint December 31, 2020 (11:19 pm)

        I’ve lived that close to it for almost five years and have had booms from them shake my house on multiple occasions, but it’s been rare as of late. 🙂

  • Cheers December 31, 2020 (6:09 pm)


    You guys, we’ve almost survived this worst year ever. Just put on a clean pair of sweat pants, hunker down, drink something, and see you in 2021! 🍻

  • ITotallyAgreeWithYou December 31, 2020 (6:19 pm)

    Heard it in N. Admiral, thought it was early fireworks.

  • ttt December 31, 2020 (6:23 pm)

    One near alaska junction now- sounded like a big firework in a garbage can.

  • Fred December 31, 2020 (6:25 pm)

    It just happened again. Same kind of boom. Definitely sounds like an explosion. I guess there are fireworks that intense. 

  • Delridge December 31, 2020 (6:35 pm)

    Heard the boom while riding my bike on Avalon. Super loud! I thought a transformer blew. 

    • WSB December 31, 2020 (6:40 pm)

      If any of this was transformer-related, there were no outages – I’ve checked the map multiple times. At this point I think we can just blame it on “fireworks” given the calendar date.

  • Fireworks December 31, 2020 (7:23 pm)

    They are probably M80 fireworks!! Try living in my neighborhood, people light them off all the time and shot off guns for the fun of it!

  • Matt P December 31, 2020 (9:31 pm)

    This is definitely fireworks.  They’re going off more and more now.  Large mortar style fireworks are very very loud.  I wish King County would ban them.

    • wsres December 31, 2020 (9:43 pm)

      It was louder and reverberated more than the motar fireworks going off now.

  • jhans January 1, 2021 (7:28 am)

    where’s Edith Kravitz when you need her?!

  • Mellow Kitty January 1, 2021 (11:15 am)

    I was walking by the Catholic school on 42nd and heard it. I flinched and stopped dead in my tracks for a few minutes, figured it was fireworks, and went about my business. It would be nice to have a solution to the mystery, though. 

    • Not a firework January 1, 2021 (12:13 pm)

      We live very close to where you were walking and I’m pretty sure that sound was not a firework. There were fireworks going off all day and night and that was a totally different sound. If anyone will solve the mystery it will be WSB

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