# Dense Fog Advisory: Elkhorn and Boulder Mountains; Canyon Ferry Area; Missouri Headwaters; Madison River Valley; Gallatin Valley; Northwest Beaverhead County; Beaverhead and Western Madison below 6000ft; Gallatin and Madison County Mountains and Centennial Mountains — retained record

> Retained us-gov-api record from us-gov-api:noaa-weather.

Canonical: https://highsignal.app/data/records/fadd641ec5527cd2

[← sources](https://highsignal.app/data)


source: [us-gov-api](https://highsignal.app/data/us-gov-api) (us-gov-api:noaa-weather)  published 2026-10-25 13:05 ingested 2026-10-26 02:52

[original source ↗](https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.da9f317c99e9b5f1be4c393227fd2f95b136b716.001.1)

## retained text



```
Dense Fog Advisory — Elkhorn and Boulder Mountains; Canyon Ferry Area; Missouri Headwaters; Madison River Valley; Gallatin Valley; Northwest Beaverhead County; Beaverhead and Western Madison below 6000ft; Gallatin and Madison County Mountains and Centennial Mountains
Severity: Moderate. Certainty: Likely.
* WHAT...Variable visibility down to a quarter mile or less in dense
fog.

* WHERE...Canyon Ferry Area, Elkhorn and Boulder Mountains,
Beaverhead and Western Madison below 6000ft, Gallatin Valley,
Gallatin and Madison County Mountains and Centennial Mountains,
Madison River Valley, Missouri Headwaters, and Northwest Beaverhead
County.

* WHEN...Until noon MDT Monday.

* IMPACTS...Low visibility could make driving conditions hazardous.
Frost deposition may cause roads to become slippery, especially
over bridges.

* ADDITIONAL DETAILS...Patchy fog is expected to become more
widespread and dense tonight into Monday morning.
```



document fetched 2026-10-26 02:52