UFOMYST
CaseTriangle1991

Sidney, MT, USA

Triangle or V of lights traveling fast and low with no sound at all.

Report quality: Moderate47/100

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: 4s (an atypical range)
  • Moderate witness text (68 characters)
  • Location geocoded exactly
  • No other reports from this city within 3 days
When
1991-07-15
Where
Sidney, MT, USA
Shape
Triangle
Duration
3-4 Seconds
Geo
47.717, -104.156 · exact
Slug
triangle-over-sidney-mt-1991-c668ce
Wave

Part of a wave

  • Historical wave1989–1991

    The Belgian Triangle Wave

    Belgium (Eupen, Wallonia, Brussels corridor)

    The definitive black-triangle wave: silent, slow platforms with three corner lights, reported by gendarmes, air-traffic controllers, and thousands of citizens. On the night of March 30-31, 1990, Belgian F-16s scrambled…

    Open wave →

In context

  • Sidney, MT shows up 6 times across the archive.
  • 2 reports came from Montana in 1991.
  • In the 1990s, 11.6% of reports described a triangle — the all-time rate is 9%.

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.