Historical clue formulations

• Radar abnormalities — 2026-03-01
• Insignificant interruptions — 2025-03-08
• Momentary disruptions — 2024-10-04
• Spots on a radar screen — 2020-06-02
• Spots of light on a radar screen — 2011-01-03
• Short-lived phenomena — 2010-02-04