public-safety
Dense Fog Advisory issued Oct. 30, 2026 by NWS Rapid City SD
Dense Fog Advisory issued October 30 at 4:23AM MDT until October 30 at 11:00AM MDT by NWS Rapid City SD. Areas named: Harding; Northern Perkins; Butte; Southern Perkins.
Published automatically from public-record data — not yet reviewed by an editor.
Key facts
- What
- Public safety
- When
- Record date Oct. 30, 2026; Added Oct. 30, 2026
- Source
- Weather alerts
- Read time
- About 3 minutes
NWS Rapid City SD issued a Dense Fog Advisory at 4:23 a.m. MDT (5:23 a.m. CDT) Oct. 30, 2026, according to the National Weather Service's public alert record.
The alert states that it takes effect at 4:23 a.m. MDT (5:23 a.m. CDT), gives the onset as 4:23 a.m. MDT (5:23 a.m. CDT) and expires at 11 a.m. MDT (noon CDT). It may reach both of South Dakota's time zones, so each time is given in both.
The alert separately states that the hazard itself ends at 11 a.m. MDT (noon CDT), which can differ from when the message expires.
Whether this alert is currently in effect is not stated in this text, deliberately: it depends on the time you are reading, so it is computed from the expiry above each time the page is loaded, rather than stored as an answer that would go out of date without anyone noticing. The status shown at the top of this page is the computed one.
The issuing office classified this message as severity "Moderate", certainty "Likely" and urgency "Expected". Those are the National Weather Service's own categories, reproduced exactly, not re-ranked or translated into another scale.
The recommended response type on the message is "Execute".
The alert names these areas: Harding; Northern Perkins; Butte; Southern Perkins. The National Weather Service zone codes are SDZ001, SDZ002, SDZ012 and SDZ078.
The issuing office's own summary line, as written at 4:23 a.m. MDT (5:23 a.m. CDT):
DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM MDT THIS MORNING
The full text of the alert as issued at 4:23 a.m. MDT (5:23 a.m. CDT), reproduced without changes:
* WHAT...Visibility down to one quarter mile or less at times.
* WHERE...Butte, Harding, Northern Perkins, and Southern Perkins.
* WHEN...Until 11 AM MDT this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
The protective-action text the issuing office attached, reproduced without changes:
If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
The National Weather Service superseded this message at 11:52 a.m. MDT (12:52 p.m. CDT) with a later one. This article records the message as issued.
This alert is a work of the United States federal government — the National Weather Service, part of NOAA — and is in the public domain; no copyright is claimed on it and none is asserted here. The alert is reproduced without added meteorological judgement. For live conditions and alerts, go to the National Weather Service.
Only alerts the National Weather Service gave a window of two hours or longer appear here, checked once a day. Short-notice warnings — including tornado and severe thunderstorm warnings, which the service typically issues for under an hour — are NOT carried here, so their absence here says nothing about whether one was issued. For those, and for live conditions, go to the National Weather Service.