Severe Severe Storm ● Active

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

Event time: Last updated: 8 hr ago United States
Icon = what happened · ring colour = how serious: Extreme Severe Moderate Minor

Loading live data… · Marker positions are approximate; severity is labelled in each popup. Sources: USGS, GDACS, NASA EONET, NOAA/NWS, EMSC.

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.

Measurements

Coordinates18.4989, -66.3032
RegionAtlantic Waters of Puerto Rico AND USVI from 10 NM to 19.5N; Coastal Waters of Northern Puerto Rico out 10 NM
Location Precisionpolygon
Issuing AuthorityUnited States of America — us-noaa-nws-en-marine
Cap UrgencyImmediate
Cap CertaintyLikely
Cap Expires2026-10-20T16:00:00-04:00

Official source

Warnings courtesy of the issuing national meteorological service, via the WMO Alert Hub.

This is an official warning issued by the authority named above. Follow its instructions and those of your local emergency services.

Severity as published by WMO Alert Hub (national weather services).

View original report

Also reported by: NWS

This event as JSON · API and licence

Source updated 8 hours ago (Oct 20, 2026 19:02 UTC) · we last heard from WMO Alert Hub (national weather services) 1 minute ago

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Official authorities in United States

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Earlier severe storm events in United States

Severe and extreme events of the same kind, before this one. Listed for scale, not because they are connected to it.

Special Marine Warning — Glacier Bay Severe Severe Storm United States closed via NWS Sep 20, 2026 Severe Thunderstorm Warning — Logan, CO; Phillips, CO Severe Severe Storm United States closed via NWS Sep 20, 2026 Special Marine Warning — Glacier Bay Severe Severe Storm United States closed via NWS Sep 20, 2026 Special Marine Warning — Cross Sound; Cape Edgecumbe to Cape Spencer out to 15 NM; Cape Spencer to Cape Fairweather out to 15 NM Severe Severe Storm United States closed via NWS Sep 20, 2026

Nearby & related events

Special Marine Warning — Atlantic Waters of Puerto Rico AND USVI from 10 NM to 19.5N Severe Severe Storm United States active via NWS 26 min ago M3.6 Earthquake — 93 km N of Brenas, Puerto Rico Minor Earthquake Puerto Rico active via USGS 2 hr ago M2.6 Earthquake — 24 km SSE of Maria Antonia, Puerto Rico Minor Earthquake Puerto Rico active via USGS 3 hr ago ALERTA POR INUNDACIONES REPENTINAS (SANTIAGO), Dominican Republic Moderate Flood Dominican Republic active via WMO 3 hr ago ALERTA POR INUNDACIONES REPENTINAS (Valverde), Dominican Republic Moderate Flood Dominican Republic active via WMO 8 hr ago

Disclaimer: figures are automatic feeds from the named agencies and may be revised. Do not use this page for life-safety decisions — follow official local emergency services.