First published Oct 20, 2026, 7:52:15 PM UTC · Last updated Oct 20, 2026, 7:52:15 PM UTC

Thunderstorms and lightning

NWS San Juan issues a special marine warning for Puerto Rico and USVI waters through 4:00 PM AST

Reported by U.S. National Weather Service Alerts NWS

The warning covered Atlantic waters of Puerto Rico and the USVI, and coastal waters of northern Puerto Rico, until 4:00 PM AST. It reported a severe thunderstorm capable of producing waterspouts and instructed people to seek safe harbor immediately.

At a glance

Affected location: Atlantic waters of Puerto Rico and the U.S. Virgin Islands; coastal waters of northern Puerto Rico

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Why it matters

The warning states that waterspouts can overturn boats and directs people in the affected waters to seek safe harbor immediately.

Location

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Generated scores

Scores are based on the cited reporting and use a 1–10 scale. Read the methodology.

Confidence: 8/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 3/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 2/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 3/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Urgency: 9/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Primary official sources

U.S. National Weather Service Alerts NWS Special Marine Warning issued October 20 at 3:01PM AST until October 20 at 4:00PM AST by NWS San Juan PR

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