Fog advisory for Calgary Wednesday
Posted Dec 3, 2025 6:53 am.
Environment and Climate Change Canada (ECCC) has issued a fog advisory for Calgary Wednesday.
The weather agency says there is near zero visibility in some areas due to fog and visibility could be suddenly reduced.
It adds that the fog is expected to clear later this morning.
Drivers are also dealing with snow that fell overnight.
Drivers are advised to turn on their lights, slow down, and maintain a safe following distance.
ECCC uses new classification system
It is classified as a ‘yellow’ alert under a new system launched by the ECCC last week.
The new tri-coloured weather alerting system came into effect Nov. 26. It replaced a system that had two colours: red for warnings (accompanied by a message about urgent impacts of weather occurring at the moment or set to occur imminently) and yellow for watches (usually about conditions that could result in severe weather).
Watches and warnings will still be issued under the new weather alert system, but will be accompanied by one of three colours that officials said will better align with impact:
- Red -set to be used rarely, tied to prolonged and widespread impact, “very dangerous” weather that’s potentially life-threatening and “will cause extreme damage and disruption”
- Orange -uncommon to be used, impacts to be “major, widespread and/or may last a few days,” likely to cause “significant damage, disruption or health impacts”
- Yellow – most common of alerts to be used, impacts to be “moderate, localized and/or short-term,” advises hazardous weather “may cause damage, disruption, or health impacts”
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-With files from Nick Westoll
