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We have heard about the many fires in Russia. NASA satellites have detected over 600 600 hotspots from wildfires within Russian territory in one day!

Fires produce a heat signature that is detectable by satellites even when the fires represent a small fraction of the pixel. Fires produce a stronger signal in the mid-wave IR bands (around 4 microns) than they do in the long wave IR bands (such as 11 microns). That differential response forms the basis for most algorithms that detect the presences of a fire, the size of the fire, the instantaneous fire temperature.

The unusually hot and dry mid-August conditions beneath a strong ridge of high pressure across British Columbia led to a major outbreak of wildfires across that western Canadian province. The satellite image shows the location of those fires as red squares. The smoke plumes are also seen on the satellite imagery.

Here's an image from a NASA instrument: The red squares are fire locations and the smoke from the fires is evident.

The aerosols released by fires and the degraded air quality caused by them represent tremendous costs to society, so reliable information on fire locations and characteristics is important to a wide variety of users. For this reason, NOAA tracks these plumes and makes them publically available from NOAA at: