First published 9/18/2026, 10:02:15 PM · Last updated 9/18/2026, 10:02:15 PM

Small Craft Advisory issued by NWS San Francisco CA

National Weather Service San Francisco issued a Small Craft Advisory on Sep 18 at 2:52 PM PDT, effective until Sep 20 at 3:00 AM PDT, warning of hazardous marine conditions for small vessels in the San Francisco coastal/nearshore 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: 6/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 4/10The 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 indicate wind, waves, or seas hazardous to small boats and recreational mariners. The advisory can disrupt local marine operations, fishing, ferry services, and pose safety risks to boaters in the San Francisco area during the effective period.

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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