Discolored water vicinity 32-19.9N 139-41.9E at 200415Z may
Philippine Sea · HYDROPAC 768/01
What this record establishes
Archived notice · 2001-05-21 12:45Z
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 266/01 200620Z MAY 01. Issued 2001-05-20 08:00Z. 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 32.332, 139.698. 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 within 11 miles of 32-27N 139-46E at 210415Z maylater cancellation 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 768/01 · this notice2001-05-20 · Archived notice
- HYDROPAC 779/012001-05-21 · Archived notice
Current notices and reporting history in the Philippine Sea →
- issued
- 2001-05-20 08:00Z
- status
- Archived notice
- authority
- NAVAREA XI 266/01 200620Z MAY 01
- NAVAREA
- NAVAREA XI · named as the source of this relay
- sea
- Philippine Sea
- position
- 32.332, 139.698
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
CHART 97029 (3RD ED). DISCOLORED WATER VICINITY 32-19.9N 139-41.9E AT 200415Z MAY.
Reading this warning
- 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 · 56.5 nm
- 180500Z issued at 190200Z sepVolcanic · 56.6 nm
Worldwide in the collected sources
12 volcanic activity listed in force · see all
Record snapshot 2026-10-03 09:22Z; 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.