First published 9/19/2026, 9:18:16 AM · Last updated 9/19/2026, 9:18:16 AM

Dense Fog Advisory — NWS Sioux Falls, SD (Sep 19, 2026)

The NWS Sioux Falls issued a Dense Fog Advisory effective Sep 19 from 4:09 AM CDT (2026-09-19T09:09:00Z) until 10:00 AM CDT (2026-09-19T15:00:00Z), covering the Sioux Falls, South Dakota area.

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: 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: 8/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Why it matters

Dense fog can drastically reduce visibility, increasing the risk of vehicle collisions and causing travel delays for road and air transportation in the affected area during the advisory period.

Location

Sources

Dense Fog Advisory issued September 19 at 4:09AM CDT until September 19 at 10:00AM CDT by NWS Sioux Falls SD

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