NOAA NWS / Event history

Special Marine Warning issued October 20 at 3:01PM AST until October 20 at 4:00PM AST by NWS San Juan PR

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

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Bulletin issued: 20 October 2026 at 19:01 UTC
First saved by us: 20 October 2026 at 19:10 UTC
Last included in a daily record: 20 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; Coastal Waters of Northern Puerto Rico out 10 NM
Certainty / urgency: Likely / Immediate
Message expiry (not hazard end): 20 October 2026 at 20:00 UTC
Forecast onset / end: 20 October 2026 at 19:01 UTC / 20 October 2026 at 20:00 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... Coastal Waters of Northern Puerto Rico out 10 NM... * Until 400 PM AST. * At 301 PM AST, A severe thunderstorm capable of producing waterspouts is now reaching the Atlantic Waters of Puerto Rico from 10 NM to 19.5N and Coastal Waters of Northern Puerto Rico out 10 NM zones, moving north-northeast at 25 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 and Coastal Waters of Northern Puerto Rico out 10 NM.

Instructions in this archived message

Move to safe harbor until hazardous weather passes. Thunderstorms can produce sudden waterspouts. Waterspouts can easily overturn boats and create locally hazardous seas. Seek safe harbor immediately.

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 · 20 October 2026 at 19:10 UTC

Saved by us

20 October 2026 at 19:10 UTC

Starting point

First saved record

Our first saved version of Special Marine Warning issued October 20 at 3:01PM AST until October 20 at 4:00PM AST by NWS San Juan PR. We have no earlier saved version to compare.

Bulletin issued: 20 October 2026 at 19:01 UTC

View saved version 1

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

{
  "id": "nws:ad0cf5a16546ac6bfa0911cd",
  "authorityId": "urn:oid:2.49.0.1.840.0.a6ccf4b4aef540660ed1c5b3c3850e47fd667828.001.1",
  "sender": "w-nws.webmaster@noaa.gov",
  "references": [],
  "category": "weather",
  "title": "Special Marine Warning issued October 20 at 3:01PM AST until October 20 at 4:00PM AST by NWS San Juan PR",
  "eventType": "Special Marine Warning",
  "occurredAt": "2026-10-20T19:01:00.000Z",
  "issuedAt": "2026-10-20T19:01:00.000Z",
  "timeBasis": "Bulletin issued",
  "effectiveAt": "2026-10-20T19:01:00.000Z",
  "onsetAt": "2026-10-20T19:01:00.000Z",
  "expiresAt": "2026-10-20T20:00:00.000Z",
  "forecastEndAt": "2026-10-20T20:00:00.000Z",
  "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; Coastal Waters of Northern Puerto Rico out 10 NM",
  "coordinates": null,
  "issuer": "NWS San Juan PR",
  "summary": "Special Marine Warning · Atlantic Waters of Puerto Rico AND USVI from 10 NM to 19.5N; Coastal Waters of Northern Puerto Rico out 10 NM. 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...\nCoastal Waters of Northern Puerto Rico out 10 NM...\n\n* Until 400 PM AST.\n\n* At 301 PM AST, A severe thunderstorm capable of producing\nwaterspouts is now reaching the Atlantic Waters of Puerto Rico from\n10 NM to 19.5N and Coastal Waters of Northern Puerto Rico out 10 NM\nzones, moving north-northeast at 25 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 and Coastal Waters of Northern Puerto Rico out 10\nNM.",
  "instruction": "Move to safe harbor until hazardous weather passes.\n\nThunderstorms can produce sudden waterspouts. Waterspouts can easily\noverturn boats and create locally hazardous seas. Seek safe harbor\nimmediately.",
  "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.a6ccf4b4aef540660ed1c5b3c3850e47fd667828.001.1",
  "source": "nws",
  "sourceName": "NOAA NWS"
}

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