UFOMYST
CaseSphere2017

Sioux Falls, SD, USA

We saw very bright round shape in the sky west and slightly north, too large and too bight to be a star. It did not move for at least 1

Report quality: Moderate55/100

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.

  • Duration parsed: 900s, a plausible sighting length
  • Detailed witness text (135 characters)
  • Location geocoded exactly
  • No other reports from this city within 3 days
When
2017-02-18
Where
Sioux Falls, SD, USA
Shape
Sphere
Duration
>15 minutes
Geo
43.544, -96.728 · exact
Slug
sphere-over-sioux-falls-sd-2017-b7c6a5
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.
  • 18 reports came from South Dakota in 2017.
  • In the 2010s, 7.1% of reports described a sphere — the all-time rate is 6.5%.

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.