UFOMYST
CaseChanging2021

Sioux Falls, SD, USA

Silent black mass moved silently above residential home, appeared boomerang shaped but video suggests cigar/changing. Moved Southeast.

Report quality: Moderate49/100

This score reflects report-quality signals on file — how complete, corroborated, and precisely located the report is — not a claim about whether the sighting was a real craft.

  • No parseable duration on file
  • Detailed witness text (134 characters)
  • Location geocoded exactly
  • No other reports from this city within 3 days
When
2021-11-21
Where
Sioux Falls, SD, USA
Shape
Changing
Duration
—
Geo
43.544, -96.728 · exact
Slug
changing-over-sioux-falls-sd-2021-ad02a1
Wave

Part of a wave

  • Historical wave2004

    The Navy Encounters & the UAP Era

    U.S. training ranges (Pacific off San Diego; Atlantic off Virginia), then worldwide reporting

    The wave that renamed the subject. The USS Nimitz 'Tic Tac' encounter (November 2004: radar drops from 80,000 ft to sea level in seconds, pilot visual by Cmdr. David Fravor, FLIR video) stayed classified-adjacent until…

    Open wave →

In context

  • Sioux Falls, SD shows up 70 times across the archive.
  • 7 reports came from South Dakota in 2021.
  • In the 2020s, 3.1% of reports described a changing — the all-time rate is 2.5%.

Nearby in space & time

within 30 days

Report

Full narrative lands with dossier import for famous cases, or the NUFORC free-text summary above for standard reports. This shell is SSR-ready: one D1 row (including connections_json) per page.