| Date: | 2017-12-01 |
| Time: | 1611 |
| Geyser: | Old Faithful |
| Webcam: | Yes |
| Initial: | No |
| Long/Short: | Long |
| Duration: | ≥3m56s |
| Time Entered: | 2017-12-01 16:11:45 |
| Time Updated: | 2017-12-01 16:15:51 |
| Time Uploaded: | 2017-12-01 16:15:51 |
| Entrant: | JarnoO |
| Observer: | |
| Submitted to: | |
| Comments: | prediction GT 1556; big preplay 1557-1558 that could've started eruption |