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Update: Dense Fog Advisory Affecting Oregon Until Thursday Morning – Visibility Down to 1/4 Mile

Visibility dropped to one-quarter mile or less in multiple Oregon regions, prompting dense fog advisories to address hazardous driving conditions, the National Weather Service said.

Summary
On Wednesday at 11:35 p.m. an updated dense fog advisory was released by the National Weather Service in effect until Thursday at 10 a.m. for John Day Basin, Foothills of the Northern Blue Mountains of Oregon, Foothills of the Southern Blue Mountains of Oregon, North Central Oregon and Central Oregon.The weather service states to expect, "Visibility one quarter mile or less in dense fog."

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The Oregonian broke the news in Portland, United States on Thursday, November 27, 2025.
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