Around 09:00 local time on 31 January 2026 (07:00 UTC), a twin-envelope balloon contraption — a paired-balloon design intended to gradually leak helium and descend — was photographed over the Šventoji coast on the Lithuanian Baltic seaboard, at the western edge of the country. It had crossed the full east-west extent of Lithuania at roughly 1–3 km altitude and ~30 km/h ground speed. The contraption appears to have malfunctioned: by design such paired envelopes are meant to descend and land over Lithuanian territory; this one instead continued drifting toward the coast.
Footage of the object over the coast was captured by local photographer Čepulio fotoklajonės on the morning of 31 January.
Reconstructed wind field
The reported ground speed (~30 km/h) and altitude band (1–3 km) are tightly consistent with the AirVeto-rendered wind field at 2,000 m during the morning window: sustained flow from the east at roughly 25–35 km/h across central-to-western Lithuania, inside AirVeto’s 85° inflow threshold on the Lithuanian-Belarusian frontier earlier in the preceding night window. The drift envelope from the Belarusian border to Šventoji at the reported altitude and speed is consistent with a release on the Belarusian side approximately 8–12 hours before the Šventoji sighting.
Altitude band matters
- At 500 m: surface and boundary-layer wind was lighter and more variable; would have produced a shorter and more curved drift path, inconsistent with the observation.
- At 2,000 m: east-to-west flow at ~30 km/h, directly matching the reported ground speed.
- At 5,000 m: still easterly but stronger; would have crossed the country faster than observed.
This kind of ground-truth match is exactly the test case AirVeto is built for — a reported sighting with a specific altitude and ground speed, cross-checked against the rendered field at a specific time and place.
What this page does and does not claim
- Claims: the rendered wind at 2,000 m at the Šventoji arrival window was consistent in direction and speed with the reported twin-envelope contraption.
- Does not claim: a specific release point, attribution, or an object-level trajectory.