Environment Canada
Fog advisories in Canada
A fog advisory is about widespread poor visibility from fog. It comes under Environment Canada’s impact guide for visibility, which also covers blizzards, blowing snow and dust: at the moderate level, routes are difficult to navigate, with delays, closures and collisions; at the high and extreme levels, travel becomes dangerous to impossible.
Environment and Climate Change Canada issues three kinds of weather alert. A warning: act now, severe weather is happening or will happen, usually 6 to 24 hours ahead (a tornado can come with less than 30 minutes’ notice). An advisory: act now, for weather less severe but still significant — blowing snow, fog, freezing drizzle and frost. A watch: get ready, the conditions favour severe weather, and it may become a warning. Each alert now also has a colour, for the impact expected where you are.
Where it is in force now
1 area. As read at 27 October at 10:01 UTC from the warnings Environment Canada publishes.
| Area | Level | From | Until |
|---|---|---|---|
| Thebacha Region including Ft. Smith - Salt River Reserve | Yellow advisory | 27 October at 07:59 UTC | 27 October at 20:01 UTC |
What the levels mean
- Yellow
- Weather that may do damage, cause disruption or affect health; moderate, local or short-lived impacts. The most common colour.
- Orange
- Weather likely to do significant damage, cause major disruption or affect health; widespread impacts, or impacts that may last a few days. Uncommon.
- Red
- Very dangerous weather, possibly life-threatening, that will do extreme damage and disruption over a wide area and for a long time. Rare.
The three colours as Environment Canada describes them, in our words.
Environment Canada asks you to read the whole text of every alert, whatever its colour: it says what to expect, where, and what to do.
The last 30 days
The areas warned each day, by level.
- 27 October 2026 — 1 area1
- 25 October 2026 — 14 areas14
- 24 October 2026 — 5 areas5
- 23 October 2026 — 7 areas7
- 22 October 2026 — 17 areas17
- 16 October 2026 — 2 areas2
- 12 October 2026 — 30 areas30
- 11 October 2026 — 1 area1
- 10 October 2026 — 1 area1
- 8 October 2026 — 1 area1
- 7 October 2026 — 13 areas13
Sources
- Environment Canada: weather alerts (warnings, advisories, watches)
- Environment Canada: colour-coded weather alerts
- Environment Canada: weather impact guides
- Environment Canada: the alerts in force, on its map
Licence of the warnings: Environment and Climate Change Canada · ECCC Data Services End-use Licence 2.1.1