First published 9/18/2026, 10:04:15 PM · Last updated 9/18/2026, 10:04:15 PM

Small Craft Advisory — NWS San Francisco (Sep 18–20, 2026)

The NWS San Francisco CA issued a Small Craft Advisory on September 18 at 2:52 PM PDT (2026-09-18T21:52:00Z), in effect through September 20 at 3:00 AM PDT. The advisory notifies mariners and small-boat operators to exercise caution in affected local coastal waters.

Categories: severe-weather-and-natural-disasters, travel-and-transportation

Generated scores

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

Confidence: 9/10How 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: 5/10The 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).
Positivity: 2/10How harmful or beneficial the event is, from strongly harmful (1) to strongly positive (10).
Urgency: 7/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Why it matters

Small Craft Advisories warn of hazardous wind and wave conditions for small vessels; they are directly relevant to marine safety, local coastal operations, and travel for recreational and commercial small boats in the San Francisco area.

Location

Sources

Small Craft Advisory issued September 18 at 2:52PM PDT until September 20 at 3:00AM PDT by NWS San Francisco CA

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