Three layers, three different meanings
The Canadian Wildland Fire Information System (CWFIS) map offers satellite hotspots, agency-reported active fires and fire-weather products. A hotspot is a thermal signature observed from space. An active fire is a report collected from a provincial, territorial or Parks Canada fire-management agency. A fire-weather layer describes conditions relevant to potential fire behaviour; it is not a map of fires that have already happened.
The CWFIS FAQ explains the difference between these products and their varying update schedules. Before comparing numbers, choose the same date and decide which category you mean. One large incident can generate many hotspots. A weather-index area can contain no reported fire at all. Neither marker count nor colour alone establishes the area burned.
Use the national view without losing the local authority
Canada covers multiple time zones and fire-management jurisdictions. CWFIS explicitly warns that its maps are approximations and may not show the most current situation. Its national view is useful for finding the region and product you want to investigate, but the responsible province, territory or national park publishes the local operational information. If a national product and a local report differ, inspect their update times and definitions before drawing a conclusion.
NASA FIRMS active-fire data provides another view of thermal detections, with selectable recent time windows and sensor products. Those are observations, not a second list of agency-reported incidents. Satellite revisit, obscuring cloud and resolution can leave gaps. Switching from MODIS to VIIRS can also change how many points you see without a matching change in the number of fires.
How to investigate a Canadian map marker
Begin at the PocketWorld wildfire overview and inspect the source and observation time for the layer you selected. Follow the provider record when available. For a broader Canada-specific comparison, open CWFIS and select hotspots, active fires or fire weather deliberately. If you are looking into smoke, remember that a hotspot map does not show a smoke plume or local air quality. Do not infer exposure at a particular address from the location of a thermal point.
Write down whether you are describing a satellite observation, a jurisdictional report or a weather index. In a shared note, include the date and time zone of the observation and the date you retrieved it. This matters especially when comparing an archived screenshot with today's page or with an agency's later revised fire report.
When the map is not enough
For travel, evacuation or property decisions, use current instructions from the relevant local emergency and fire authority. PocketWorld does not issue warnings and may show delayed or retained data. An apparently clear map is not an all-clear. Our source registry explains provenance; the hotspot guide explains why satellite pixels cannot be read as precise fire boundaries.
Data sources
References are linked beside the explanations above. This evergreen guide does not report current incidents.