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Public safety / First published

Dense Fog Advisory issued Sept. 9, 2026 by NWS Sioux Falls SD

Published automatically from public-record data — not reviewed by an editor. This heading is the article's current headline.

Article identifier: alert-490298041f87fb8745ec057bac97de270ce3de40-001-1

Read the live article →

Version history

Every published version of this article, newest first. Versions are append-only: a correction adds a row, it never rewrites history. Each version below states what changed against the version before it — which fields moved, and which body lines were added or removed.

The content hash is a SHA-256 fingerprint of that version's stored headline and body, computed when the version was written. Two versions with the same hash hold identical text; a changed hash proves the text moved. It is the tamper-evidence check — recompute it against an exported copy of a version and any silent edit shows up as a mismatch.

How we verify a hash — and how you can

Canonicalization: the hashed bytes are the version's stored headline, then the two characters ||, then the version's stored body markdown — UTF-8, SHA-256, lowercase hex. Nothing else is in the input: no normalization, re-wrapping or rendering is applied first, no trailing newline is added, and no other field (including the parent version's id) is mixed in.

Export a version's stored headline and body, join them with the two characters ||, and take the SHA-256 of the UTF-8 bytes. It must equal the hash printed beside that version. In a shell: 

printf '%s' "HEADLINE||BODY" | shasum -a 256

  1. Version 2

    Source update — the underlying public record changed

    Automated update from the source feed — no human edit

    The body text changed; the headline did not. (compared against version 1)

    Added (2 lines)

    • The National Weather Service superseded this message at Sept. 9, 2026, 7:02 a.m. MDT / 8:02 a.m. CDT with a later one. This article records the message as issued.

    Content hash: e86c380c2fd816927d340b01a660910e3af5a2998848c7a382d38f759a47e549

  2. Version 1

    Initial publication

    Initial automated publication — no human byline

    No earlier version is in this record, so there is nothing to compare against.

    Content hash: fc3e4275e30f863624f1444e4aa7e0e3425e6df3fe6f2ac6d0caa1e10537151a

1 correction has been issued.

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