Discolored water in vicinity 27-16.7N 140-56.6E at 120643Z oct
Philippine Sea · HYDROPAC 2917/21
What this record establishes
Archived notice · 2022-03-25 12:51Z
This notice comes from the historical archive. Its archived status does not establish when or how the reported situation ended.
- Source and dates
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · NAVAREA XI 326/21 130427Z OCT 21.. Issued 2021-10-13 06:01Z. First collected 2026-08-17 13:38Z; last seen in collection 2026-08-17 15:46Z. Collection dates record ingestion, not a new incident or a fresh field observation.
- Location covered
- Philippine Sea. The parsed report position is 27.278, 140.943. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.
Related notices and cancellation links
- Discolored water in vicinity 27-16.7N 140-56.6E at 120643Z octcancelled by this notice
These reports were linked by category and sea, with positions within 30 nautical miles and issue dates within 30 days of another report's recorded in-force span. Links can extend through other members, so the full group can cover a larger area or period. Proximity does not confirm that they describe one incident.
- HYDROPAC 3739/202020-12-18 · Archived notice
- NAVAREA XI 488/202020-12-18 · Cancelled notice
- NAVAREA XI 325/212021-10-12 · Listed in force
- HYDROPAC 2908/212021-10-12 · Archived notice
- HYDROPAC 2909/212021-10-12 · Archived notice
- NAVAREA XI 326/212021-10-13 · Listed in force
Current notices and reporting history in the Philippine Sea →
- issued
- 2021-10-13 06:01Z
- status
- Archived notice
- authority
- NAVAREA XI 326/21 130427Z OCT 21.
- NAVAREA
- NAVAREA XI · named as the source of this relay
- sea
- Philippine Sea
- position
- 27.278, 140.943
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
PHILIPPINE SEA. JAPAN. DNC 12. 1. DISCOLORED WATER IN VICINITY 27-16.7N 140-56.6E AT 120643Z OCT. 2. CANCEL HYDROPAC 2909/21.
Reading this warning
- DNC (Digital Nautical Chart)
- A reference to one of the regions of NGA's Digital Nautical Chart, used to tell the reader which charts a warning affects.
- Discoloured water
- Patches of unusually coloured sea — often a sign of a submarine volcano or of a shoal.
- Position (degrees and minutes)
- How warnings write positions: degrees, a hyphen, then minutes, with N/S and E/W — 49-40.8N 003-43.8W.
- Date-time group (DTG)
- A compact UTC timestamp — day, hour and minute followed by Z — such as 201500Z for the 20th at 15:00 UTC.
- Cancellation reference
- A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
- HYDROPAC
- The U.S. long-range warning series for the Pacific outside NAVAREA XII and for the Indian Ocean, Persian Gulf and adjoining seas.
Collected reports in this area · volcanic activity
48 within 180 nm since 1996 · 2 in the last 12 months · 6 listed in force now
Counts include repeat notices about the same situation. NGA archive coverage ends 2024-05; live collection began 2026-08-17. The period between them is incomplete. An empty year is not evidence that no hazards occurred.
- Volcanic activity reported in area within one mile of 27-14.60N 140-52.70E at 080200Z sep2026-09-08
- 080200UTC issued at 080200UTC sep 2026 volcanic warning volcano name:nishino shima LOCATION:27-14.6N…2026-09-08
- Volcanic activity reported at io-to in vicinty of 24-45.00N 141-17.3E2025-09-02
- Volcanic activity reported in area within 400 meters of 24-45.44N 141-19.60E2024-10-23
- Volcanic activity reported in area within 400 meters of 24-45.44N 141-19.60E at 100428Z nov2023-11-10
- Discolored water reported in vicinity 25-27.10N 141-14.50E at 140425Z jun2023-06-14
Month of issue in the collected archive
All available years combined. Uneven collection and repeat bulletins affect these counts; this chart does not measure the seasonality or probability of incidents.
Nearby notices listed in force · within 120 nm
- Discoloured water observed in extending south for 5 miles, 2 mile wide, from 27-16.7N 140-56.6E at 120643Z octVolcanic · 0 nm
- Discoloured water observedVolcanic · 3.3 nm
- 080200UTC issued at 080200UTC sep 2026 volcanic warning volcano name:nishino shima LOCATION:27-14.6N…Volcanic · 4.1 nm
- Chichi shima, futami ko NR.3 light buoy, 27-04.9N 142-11.2E, L.LNav aids · 67.4 nm
- Discoloured water observed in vicinity of 25-27.1N 141-14.5E at 140425Z junVolcanic · 110.8 nm
Worldwide in the collected sources
12 volcanic activity listed in force · see all
Record snapshot 2026-10-01 15:24Z; source collection times vary.
Volcanic
Submarine eruptions, discoloured water, pumice rafts. All current volcanic activity →
Not for navigation. This is a re-rendering of an official navigational warning for awareness; mariners must use official NAVAREA broadcasts and their national MSI service.