| Clue | Source | Date |
|---|---|---|
| They may form on streams in winter (2 wds.) | ||
| Causes of some winter roof leaks | Premier Sunday | 27 Aug 2023 |
| Wintry roof buildups | USA Today | 25 Jun 2020 |
| They form when water freezes at a roof's edge | New York Times | 01 Dec 2015 |
| They form when water freezes at a roof's edge | ||
| Cold-weather blockages | ||
| They form when melted snow refreezes at roof edges |