An account in Hauts-de-Seine, France

The observation of orange luminous shapes crossing the sky in less than a minute, on a weekend night, strongly suggests a Thai lantern, probably released nearby at the end of a private party, possibly related to Halloween. The movement is observed from south to northeast. The wind recorded at Orly is weak (4 to 7 km/h) from the south sector (southeast recorded at Toussus and Pontoise). The witness describes a movement toward the north and east, which may be compatible with the local wind, though difficult to estimate precisely due to the proximity of the Seine. But the rapid movement (12 seconds to cross a large part of the sky) is hardly compatible with a light wind. The instabilities noted may have been caused by non-uniform local winds. The dynamics of the phenomenon described by the witness fit this Thai lantern hypothesis poorly. (See the reconstruction video made by the witness.) Due to the lack of knowledge of the precise weather, and the lack of cross-checks, the GEIPAN classifies the case as "C".