| Date: | 2021-10-09 |
| Time: | 0852:49 |
| Geyser: | Old Faithful |
| Webcam: | Yes |
| Initial: | No |
| Long/Short: | N/A |
| Duration: | >3m19s |
| Standardized Duration: | >3m 19s |
| Time Entered: | 2021-10-09 09:05:03 |
| Time Uploaded: | 2021-10-09 09:05:04 |
| Entrant: | JarnoO |
| Observer: | |
| Submitted to: | GeyserTimes for Android |
| Comments: | medium-long. Preplay 0840:51 d=53s included jets up to a third usual eruptive height. After that no preplay until eruption start, but did see heavy huffing at approx. 3m intervals. |