Forecast PM2.5 smoke and a visibility-risk score that combines surface
particulate levels with the temperature/dewpoint spread. Three layers are
available: surface risk, surface PM2.5, and smoke aloft (enroute).
Why dewpoint spread matters
When humidity is high (a small temperature/dewpoint spread), smoke
particles absorb moisture and grow, scattering more light. Visibility can
drop sharply aloft even when the surface looks clear.
Risk score
0 β Good VMC1 β Some haze2 β Marginal VFR3 β Likely IFR
β Important limitations β please read
This is forecast model output, not real-time observations.
It is an unofficial tool, not a government weather or aviation product.
Smoke aloft is inferred from a model, not directly measured.
Automated stations (METARs) may not report smoke-reduced visibility; treat clear reports with caution.
It is never a substitute for official weather briefings, METARs, TAFs, NOTAMs, or your own judgment.