Start with time, not color
A smoke map is a forecast frame, not a permanent layer. Before interpreting any color, check the model run time and the frame’s valid time in your local timezone. Smoke Window uses three-hour steps, so the frame labeled 2 PM represents the model field at that forecast time. Moving the scrubber changes the evidence beneath the answer; it does not interpolate a continuous animation or invent values between frames.
The location marker matters because the headline is calculated from the model grid cell containing that point. A colorful plume nearby can look alarming while the selected cell remains in a lower band, or the reverse can happen along a sharp plume edge. Pan and zoom to understand the regional pattern, then return to the marker before comparing the map with the timeline.
Separate the basemap from the smoke layer
Roads, cities, boundaries, and place names come from the underlying OpenStreetMap basemap. The colored squares are a separate HRRR-Smoke raster reprojected into Leaflet. Smoke Window keeps the discrete model cells visible and does not blur them into false street-level detail. Layer opacity can be reduced or the smoke layer can be hidden temporarily so geographic labels remain readable.
The display colors communicate increasing modeled smoke mass, but they are not AQI colors or health categories. Use the numeric concentration ranges in the legend. White or transparent areas mean the modeled concentration is below the visible display cutoff or outside usable data—not proof that every pollutant is absent.
Use maps as regional evidence
A map is most useful for seeing the shape, timing, and direction of modeled change across a region. Watch whether the same band persists over several frames, whether a plume edge approaches the selected point, and whether multiple nearby cells agree. Avoid treating one isolated block or a single exact value as a street-level reading.
Reported wildfire and incident-complex records add context, not attribution. A nearby fire is not automatically the source of smoke at the marker, and distance alone does not reveal transport direction or contribution. Prescribed-fire records are excluded from Smoke Window’s fire view even though biomass-burning emissions may still appear in the model.
A five-step map-reading routine
First confirm the place marker. Second read the valid time. Third match the marker’s band to the numeric legend. Fourth compare the cells around the marker so a plume edge is visible in context. Fifth move one frame backward and forward. That short routine prevents the most common mistake: reacting to the brightest color anywhere on the screen even though it belongs to another time or region. On a phone, use Explore map only while panning, then choose Done so the page can scroll normally.
Why the cells stay blocky
Smoke Window deliberately uses nearest-cell display instead of smoothing the raster. Smoothing would make a coarse forecast look more precise and could create colors that never existed in the source values. The block pattern also reveals where the model changes sharply over short distances. The approximately 3 kilometer grid remains much larger than a street, so zooming in adds basemap detail but does not add forecast resolution. A location chip always refers to the cell containing its representative point.
What transparent space means
The layer hides values below its visible cutoff and contains no road labels, wind barbs, or boundaries from NOAA graphics. Transparency lets the basemap remain readable; it should not be interpreted as a monitored zero. A transparent cell can still contain other pollutants, smoke above the modeled near-surface layer, or a small smoke value below display. If the layer fails to load, the interface identifies a missing frame instead of painting a favorable color.
City, county, and state map limits
A city page follows one Census representative point, and conditions can differ across neighborhoods. A county page samples one Census internal point and is explicitly not countywide. A state page fits a broader map but calculates only three named city samples from the same frames. It does not average those samples, pick a cleanest city, or make a statewide claim. For a trailhead, workplace, or destination away from the listed point, search that actual place.
Map evidence and health decisions
The smoke layer is deterministic model guidance for primary fire-emitted fine-particle mass near roughly 8 meters above ground. The latest nearby AirNow NowCast AQI is a separate observed product that may be driven by PM2.5, PM10, or ozone. Use the map to understand forecast timing and regional pattern, then use AirNow and official local guidance for health-oriented decisions. Reload before an important plan because a new model run can move a plume boundary.
Bottom line: wildfire smoke map
A trustworthy smoke map makes its time, scale, units, point location, and uncertainty visible at the moment of use. If any one of those is missing, pause before drawing a conclusion. Smoke Window keeps the pixels discrete and the observation separate so the map can answer a modest but useful question: how does this model expect near-surface smoke to change around this point over the next 48 hours?