Distance is not direction
Smoke can travel hundreds or thousands of miles, pass above a location, mix down later, or be carried away from a nearby fire. A list sorted by fire distance cannot determine which incident contributed to a local plume. Wind changes with height and time, and plume-rise height affects which transport path smoke follows.
Smoke Window therefore labels WFIGS points as reported wildfire and incident-complex records. It does not draw lines from incidents to smoke cells or say that the nearest record caused the modeled concentration. Complex and child records can coexist, and prescribed-fire records are excluded from the map.
Use several kinds of evidence
NOAA’s Hazard Mapping System uses satellite observations to identify smoke plumes and fire locations. Incident systems describe reported operational events, while trajectory or transport analysis helps connect a plume through time. No single source answers every part of the question.
HRRR-Smoke is useful transport guidance, but its concentration field alone does not establish formal attribution. A model plume that visually overlaps a fire should be treated as a hypothesis. Dated claims should be corroborated with satellite plume analysis, time-consistent winds, and authoritative fire reporting.
What the map can responsibly say
The map can show where the model predicts smoke mass and which wildfire records are reported in a chosen area. It can help users notice a regional transport pattern, but not identify a unique source with certainty. Acreage and containment are operational measures; neither directly tells how much smoke a fire is producing.
For a local event, look for statements from air-quality agencies, National Weather Service offices, or incident teams that combine observations and meteorology. These sources may be able to describe likely transport while preserving appropriate uncertainty.
Follow the plume through time
A plausible source story must work chronologically. The fire must be active before the observed or modeled plume, winds at the relevant heights must connect the areas, and satellite plume positions should progress consistently. Drawing a straight line between a current fire point and a current smoke cell ignores travel time and vertical transport. Animation can reveal a coherent path, but it remains supporting evidence rather than a formal source attribution.
Why incident names can be misleading
WFIGS is an operational reporting system. A complex record and several child incidents may appear together, coordinates may mark an administrative point, and perimeters can lag active growth. Counting markers does not necessarily count distinct sources. Names and acreage help users open authoritative incident information, but they do not quantify emissions. Smoke Window excludes prescribed-fire records, so its nearby list is not an inventory of every combustion source represented by the atmospheric model.
Surface smoke can arrive from far away
An elevated plume may travel far beyond the fire before atmospheric mixing brings some of it toward the ground. In that situation the closest reported incident may be unrelated, while a distant regional event supplies more of the smoke. Conversely, a nearby fire can send its plume away from the location. Wind at the surface alone is insufficient because transport often occurs higher in the atmosphere. Vertical profiles and time-consistent plume analysis are important.
Use official attribution statements
National Weather Service offices, air districts, state environmental agencies, tribal authorities, and incident teams sometimes publish smoke-source discussions based on satellite imagery and meteorology. Those statements can integrate evidence unavailable in a simple consumer map. When a source matters—for example, explaining an event publicly—link to that dated analysis. Avoid turning an attractive animation into a categorical claim that one incident or country caused local conditions.
A responsible source-investigation workflow
Start with NOAA Hazard Mapping System smoke polygons and fire detections, then check authoritative incident data and the forecast transport sequence. Compare valid times, not just current screenshots. For cross-border events, add Canadian Wildland Fire Information System or provincial reports. Finally, look for agency interpretation. If the evidence remains mixed, describe several possible contributors and state the uncertainty. Proximity, containment, and plume color should never be used alone as a source test.
Bottom line: where is wildfire smoke coming from
Source questions deserve a chain of evidence, not a nearest-marker shortcut. Use incident reporting to learn what is burning, satellite analysis to see observed plumes, meteorology to evaluate transport, and agencies to interpret the event. HRRR-Smoke can strengthen the transport story but cannot prove ownership of a particle. When the chain is incomplete, describe likely contributors and uncertainty instead of forcing a single-fire answer. A careful explanation is allowed to end with more than one plausible contributor.