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The Forest fire weather index (FWI) (French: indice forêt météo, IFM) is an estimation of the risk of wildfire computed by Météo France and the Meteorological Service of Canada. It was introduced in France in 1992 but is based on a Canadian empirical model developed and widely used since 1976.
A fire danger index of between 12 and 25 on the index is generally considered a "high" degree of danger, while a day having a danger index of over 50 is considered a "severe" fire danger rating. Above this level in 2010 a distinction was made between forest and grassland fuels.
The National Weather Service issues a similar high wind warning (Specific Area Message Encoding code: HWW) for high winds on land. The criteria vary from place to place; however, in most cases, the warning applies to winds of 40 miles per hour (64 km/h) to 73 miles per hour (117 km/h) for at least 1 hour; or any gusts of 58 miles per hour (93 km/h) to 114 miles per hour (183 km/h) on land.
The Post fire by late Sunday had reached nearly 15,000 acres. In Sonoma County, a separate blaze tore through an unknown number of structures. Crews battle wildfires near Gorman and Sonoma ...
The index is calculated over three ranges of atmospheric pressure: low elevation (950-850 millibars (mb)), mid elevation (850-700 mb), and high elevation (700-500 mb). [ 2 ] A Haines Index of 6 means a high potential for an existing fire to become large or exhibit erratic fire behavior, 5 means medium potential, 4 means low potential, and ...
The Met Office has issued yellow weather warnings for Friday and Saturday for some of the “strongest winds of the winter so far.”. The warnings are in place in large parts of Scotland and ...
When patches of mixed conifer forest are killed by high severity fire events, sclerophyll vegetation can establish first and create a new alternative stable state with its own self-reinforcing feedback with fire. [1] Therefore, a high severity fire event is considered a destabilizing transition between mixed conifer forest and a sclerophyll ...
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