UFOMYST
CaseCircle2017

Grass Valley, CA, USA

I seen it twice in one night. Once with a witness bright orb traveling through the sky bright flash then disappeared. I also was taking

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: 30s, a plausible sighting length
  • Detailed witness text (135 characters)
  • Location geocoded exactly
  • No other reports from this city within 3 days
When
2017-08-31
Where
Grass Valley, CA, USA
Shape
Circle
Duration
30 seconds
Geo
39.219, -121.061 · exact
Slug
circle-over-grass-valley-ca-2017-92c036
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 →
Local cluster

Local cluster

This sighting is part of a small burst — 3 Grass Valley, CA reports filed in August 2017.

In context

  • Grass Valley, CA shows up 34 times across the archive.
  • 594 reports came from California in 2017.
  • In the 2010s, 12.3% of reports described a circle — the all-time rate is 10.6%.

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.