| Date: | 2015-12-27 |
| Time: | 1639 |
| Geyser: | Old Faithful |
| Webcam: | Yes |
| Initial: | No |
| Long/Short: | Long |
| Duration: | ~3.75-4m |
| Time Entered: | 2015-12-27 16:40:19 |
| Time Updated: | 2015-12-27 18:46:40 |
| Time Uploaded: | 2015-12-27 16:46:25 |
| Entrant: | JSJ |
| Observer: | James St. John |
| Submitted to: | |
| Comments: | Visible preplay at 1636. Eruption start at late 1639. First tall spouting at early 1640. Apparently done at late 1643 (saw last small water spout at 1643 + 49s). |