| Date: | 2021-12-21 |
| Time: | 1143 |
| Geyser: | Grand |
| Webcam: | Yes |
| Initial: | No |
| Major/Minor: | N/A |
| Duration: | ≥10m12s |
| Grand Code: | -1- |
| Time Entered: | 2021-12-21 12:12:05 |
| Time Uploaded: | 2021-12-21 12:12:05 |
| Entrant: | JarnoO |
| Observer: | |
| Submitted to: | Geysertimes.org |
| Comments: | 1143:±16; not sure whether 10m12s is end since a large plume encompassing boardwalk to well into the trees developed at that time; appeared C as of 1155:27 |