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Dense Fog Advisory issued October 13 at 11:15AM MDT until October 13 at 12:00PM MDT by NWS Great Falls MT

Official severe-weather alerts, warning areas, and disaster updates.

expired · active · official-source

* WHAT...Highly variable visibility as low as one quarter of a mile in dense fog. * WHERE...Canyon Ferry Area, Gallatin Valley, Madison River Valley, and Missouri Headwaters. * WHEN...Until noon MDT today. * IMPACTS...Low visibility could make driving conditions hazardous. If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

Event time
Source last updated
Current version retrieved
Provider
NWS — active weather alerts (Storm)
Location
MT, US
Severity
Moderate
area
Canyon Ferry Area; Missouri Headwaters; Madison River Valley; Gallatin Valley
event
Dense Fog Advisory
onset
2026-10-13T11:15:00-06:00
states
["MT"]
urgency
Expected
certainty
Likely
effective
2026-10-13T11:15:00-06:00
message id
urn:oid:2.49.0.1.840.0.99c67c2f260ac6d14784d12ca1380de4c3bb540d.002.1
references
["urn:oid:2.49.0.1.840.0.d3288c450cabcfd8f152fc7fd0dd493c6093f5a8.001.1","urn:oid:2.49.0.1.840.0.abf797a006566fbeccb7cbcaa8cebdd1498d0a82.002.1","urn:oid:2.49.0.1.840.0.fe2dd78662c5437beb51a25d20916da5f68f8cc6.002.1"]
instruction
If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
message type
Update
location basis
Approximate: centers of the NWS zones listed in the alert
freshness minutes
60
Read the official source

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Update history (3 recent revisions)

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