Discolored water in vicinity 31-54.5N 140-01.6E at 240250Z mar
Philippine Sea · HYDROPAC 1024/17
What this record establishes
Archived notice · 2018-09-07 11:39Z
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 195/17 240636Z MAR 17.. Issued 2017-03-24 07:29Z. 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 31.908, 140.027. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.
Current notices and reporting history in the Philippine Sea →
- issued
- 2017-03-24 07:29Z
- status
- Archived notice
- authority
- NAVAREA XI 195/17 240636Z MAR 17.
- NAVAREA
- NAVAREA XI · named as the source of this relay
- sea
- Philippine Sea
- position
- 31.908, 140.027
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
WESTERN NORTH PACIFIC. PHILIPPINE SEA. DNC 12. CHART 97029. DISCOLORED WATER IN VICINITY 31-54.5N 140-01.6E AT 240250Z MAR.
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.
- Chart reference
- The number of the nautical chart on which the reported position lies.
- 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.
Collected reports in this area · volcanic activity
12 within 180 nm since 2001 · 0 in the last 12 months · 2 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.
- Possible volcanic activity reported in 31-26.30N 140-03.00E2024-09-19
- Discolored water reported in 31-26.40N 140-03.00E at 180545Z sep2024-09-19
- Discoloured water observed in vicinity of 31-26.4N 140-03.0E at 180545Z sep2024-09-19
- 180500Z issued at 190200Z sep2024-09-19
- Possible pumices adrift in vicinity of trackline joining 30-41.00N 139-51.00E, 30-24.00N 139-45.00E,…2023-10-20
- Possible pumices adrift in vicinity of trackline joining 30-41.00N 139-51.00E, 30-24.00N 139-45.00E,…2023-10-20
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 vicinity of 31-26.4N 140-03.0E at 180545Z sepVolcanic · 28.1 nm
- 180500Z issued at 190200Z sepVolcanic · 28.2 nm
Worldwide in the collected sources
12 volcanic activity listed in force · see all
Record snapshot 2026-10-01 19:18Z; 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.