UFOMYST
CaseChevron1977

Diamond Bar, CA, USA

Huge flying saucer type object observed closely on Pomona Fwy near Diamond Bar, CA in 1978.

Report quality: Moderate51/100

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: 1200s, a plausible sighting length
  • Moderate witness text (91 characters)
  • Location geocoded exactly
  • No other reports from this city within 3 days
When
1977-09-01
Where
Diamond Bar, CA, USA
Shape
Chevron
Duration
20 minutes
Geo
34.029, -117.810 · exact
Slug
chevron-over-diamond-bar-ca-1977-bdd032
Wave

Part of a wave

  • Historical wave1977–1978

    Colares & Operação Prato

    Ilha de Colares and the Baixo Amazonas, Pará, Brazil

    The most physically aggressive wave on record. Luminous objects — locals called them 'chupa-chupa' (sucker-sucker) — descended nightly over fishing villages, projecting beams that left burns, puncture marks, anemia and…

    Open wave →

In context

  • Diamond Bar, CA has 11 sightings on file here.
  • 1977 brought 44 reports from California.
  • The 1970s skewed 1.1% chevron reports; the archive-wide figure is 1.1%.

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.