Fires

The Tomorrow.io REST Weather API fires insight category will trigger for any of the events below.

Active Fire

Issued when a fire pixel has been acquired by the Visible Infrared Imaging Radiometer Suite (VIIRS) aboard the joint NASA/NOAA Suomi National Polar-orbiting Partnership (Suomi NPP) and NOAA-20 satellites.

Note that region influenced by the South Atlantic Magnetic Anomaly may cause spurious brightness temperatures, leading to potential false positive alarms.

radiativePower
Depicts the pixel-integrated fire radiative power in MW (megawatts)

certainty
The confidence that a fire exists within the detected location - observed (high, 80-100%), likely (nominal, 30-79%), or possible (low, 0-29%)

origin
"VIIRS" - Visible Infrared Imaging Radiometer Suite

Fire Weather (Watch)

Issued when conditions are favorable for a potentially dangerous fire, in cases where the following four criteria are met:
(1) surface relative humidity (RH) less than 25%
(2) sustained surface wind of 15 MPH or greater
(3) 10-hour fuel moisture less than 8%
(4) temperature 75°F or greater

Red Flag (Warning)

Issued when conditions are favorable for a potentially dangerous fire, in cases where the following four criteria are met:
(1) surface relative humidity (RH) less than 25%
(2) sustained surface wind of 15 MPH or greater
(3) 10-hour fuel moisture less than 8%I
(4) temperature 75°F or greater

Rangeland Fire Danger (Statement)

Issued when fuels are not yet deemed critical, but weather conditions are expected to meet red flag criteria OR if weather conditions are near to, but do not quite meet red flag criteria, while fuels are critical.

In general, issuance will be considered when weather conditions are:
(1) temperatures are greater than or equal to 10 degrees F above normal
(2) winds sustained 15 mph or greater
(3) relative humidity less than 25%