First published 9/19/2026, 9:19:15 AM · Last updated 9/19/2026, 9:19:15 AM

Dense Fog Advisory issued by NWS Sioux Falls (Sept 19 morning)

The National Weather Service office in Sioux Falls, SD issued a Dense Fog Advisory beginning September 19 at 4:09 AM CDT (2026-09-19T09:09:00Z) through 10:00 AM CDT. Dense fog can significantly reduce visibility across the advisory 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: 4/10How 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

Reduced visibility from dense fog increases the risk of vehicle collisions and travel delays for morning commuters and regional transportation. Travelers should allow extra time, use headlights, and exercise caution.

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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