WISPS
| Date | Clue |
|---|---|
| 2024-03-24 | Smoky tendrils |
| 2022-10-22 | Puffs |
| 2022-06-05 | Strands |
| 2017-09-23 | Cirrus clouds, e.g. |
| 2017-07-09 | Cirrus clouds, e.g. |
| 2013-02-27 | Traces of smoke |
| 2009-12-22 | Cirrus cloud formations |
| 2004-11-10 | Thin tufts |
| 2002-12-07 | Thin puffs |
| 2000-10-29 | Slender traces |
| 1996-09-28 | Thin strands |