NOAA NWS / Event history

Special Marine Warning issued October 20 at 11:09PM AST until October 21 at 12:30AM AST by NWS San Juan PR

Special Marine Warning · Atlantic Waters of Puerto Rico AND USVI from 10 NM to 19.5N. Severe; likely; urgency: immediate.

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Bulletin issued: 21 October 2026 at 03:09 UTC
First saved by us: 21 October 2026 at 03:10 UTC
Last included in a daily record: 21 October 2026
The linked daily edition preserves what we captured that UTC day; this event page is not a live warning.
Source classification: Severe · Source alert

A recent feed check does not mean a new observation. This page preserves source records; it does not establish current safety or warning status.

Issuer / area: NWS San Juan PR · Atlantic Waters of Puerto Rico AND USVI from 10 NM to 19.5N
Certainty / urgency: Likely / Immediate
Message expiry (not hazard end): 21 October 2026 at 04:30 UTC
Forecast onset / end: 21 October 2026 at 03:09 UTC / 21 October 2026 at 04:30 UTC

Archived official description

SMWSJU The National Weather Service in San Juan has issued a * Special Marine Warning for... Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N... * Until 1230 AM AST. * At 1109 PM AST, a severe thunderstorm capable of producing waterspouts was located over open waters of Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N zone, moving northeast at 10 knots. HAZARD...Waterspouts. SOURCE...Radar indicated. IMPACT...Waterspouts can easily overturn boats and create locally hazardous seas. * Locations impacted include... Mainly open waters of Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N.

Instructions in this archived message

Move to safe harbor until hazardous weather passes. Boaters should seek safe harbor immediately until this storm passes. Wind gusts 34 knots or greater, high waves, dangerous lightning, and heavy rain are possible with this storm. Report severe weather to the Coast Guard or nearest law enforcement agency. They will relay your report to the National Weather Service office.

The saved record

What changed

0 updates · 1 first record

Each update compares two versions we saved. This may not include every update from the source. A missing report does not mean an event has ended.

First saved record · 21 October 2026 at 03:10 UTC

Saved by us

21 October 2026 at 03:10 UTC

Starting point

First saved record

Our first saved version of Special Marine Warning issued October 20 at 11:09PM AST until October 21 at 12:30AM AST by NWS San Juan PR. We have no earlier saved version to compare.

Bulletin issued: 21 October 2026 at 03:09 UTC

View saved version 1

Original saved fields, unchanged. This is our record, not an archived copy of the external webpage.

{
  "id": "nws:8efe8f039f0ec606d2730e37",
  "authorityId": "urn:oid:2.49.0.1.840.0.cc035ca7b4569f4756e41ab1d6e4249dafb81d03.001.1",
  "sender": "w-nws.webmaster@noaa.gov",
  "references": [],
  "category": "weather",
  "title": "Special Marine Warning issued October 20 at 11:09PM AST until October 21 at 12:30AM AST by NWS San Juan PR",
  "eventType": "Special Marine Warning",
  "occurredAt": "2026-10-21T03:09:00.000Z",
  "issuedAt": "2026-10-21T03:09:00.000Z",
  "timeBasis": "Bulletin issued",
  "effectiveAt": "2026-10-21T03:09:00.000Z",
  "onsetAt": "2026-10-21T03:09:00.000Z",
  "expiresAt": "2026-10-21T04:30:00.000Z",
  "forecastEndAt": "2026-10-21T04:30:00.000Z",
  "severity": "Severe",
  "urgency": "Immediate",
  "certainty": "Likely",
  "messageType": "Alert",
  "status": "Source alert",
  "place": "Atlantic Waters of Puerto Rico AND USVI from 10 NM to 19.5N",
  "coordinates": null,
  "issuer": "NWS San Juan PR",
  "summary": "Special Marine Warning · Atlantic Waters of Puerto Rico AND USVI from 10 NM to 19.5N. Severe; likely; urgency: immediate.",
  "description": "SMWSJU\n\nThe National Weather Service in San Juan has issued a\n\n* Special Marine Warning for...\nAtlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N...\n\n* Until 1230 AM AST.\n\n* At 1109 PM AST, a severe thunderstorm capable of producing\nwaterspouts was located over open waters of Atlantic Waters of\nPuerto Rico and USVI from 10 NM to 19.5N zone, moving northeast at\n10 knots.\n\nHAZARD...Waterspouts.\n\nSOURCE...Radar indicated.\n\nIMPACT...Waterspouts can easily overturn boats and create locally\nhazardous seas.\n\n* Locations impacted include...\nMainly open waters of Atlantic Waters of Puerto Rico and USVI from\n10 NM to 19.5N.",
  "instruction": "Move to safe harbor until hazardous weather passes.\n\nBoaters should seek safe harbor immediately until this storm passes.\nWind gusts 34 knots or greater, high waves, dangerous lightning, and\nheavy rain are possible with this storm.\n\nReport severe weather to the Coast Guard or nearest law enforcement\nagency. They will relay your report to the National Weather Service\noffice.",
  "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.cc035ca7b4569f4756e41ab1d6e4249dafb81d03.001.1",
  "source": "nws",
  "sourceName": "NOAA NWS"
}

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