Air carrier First Officer reported a near midair collision with a silver object; possibly a weather balloon; while they were on descent.

What the Reporter Described

Report 1 | Narrative: On descent; a silver object (weather balloon?) zipped under our nose at about FL245 just a few hundred below us. Nothing on TCAS. reported to ATC.

Report 1 | Synopsis: Air carrier First Officer reported a near midair collision with a silver object; possibly a weather balloon; while they were on descent.

Safety Center · Close Calls · NASA ASRS

ACN 2026702

Unrated

Air carrier First Officer reported a near midair collision with a silver object; possibly a weather balloon; while they were on descent.

What the Reporter Described

Report 1 | Narrative: On descent; a silver object (weather balloon?) zipped under our nose at about FL245 just a few hundred below us. Nothing on TCAS. reported to ATC.

Report 1 | Synopsis: Air carrier First Officer reported a near midair collision with a silver object; possibly a weather balloon; while they were on descent.