| 24
Hour Fire Weather Forecast Map
| The
24 Hour Fire Weather Index (FWI) map below depicts a prediction of potential
fire conditions for the twenty-four period of the date shown. This map
does not indicate a level of wildfire threat, but shows the potential
level of wildfire intensity should one break out. |
The Fire Weather Maps and Indices will resume on April 2009
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This
map is updated daily between 1:30 PM and 2:00 PM during fire season.
Please Note: Blank areas denote non-reporting district office stations. |
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(Click on the map to view a full size version.)
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Disclaimer
This forecast is valid for 24 hours only, weather conditions are constantly changing. This information has
been prepared for your convenience and has no official sanction.
For further information contact the Fire Control Centre. |
Standard
Components of the Fire Weather Index
The six standard components of the FWI System provide numerical
ratings of relative wildland fire potential. The first three components
are fuel moisture codes that follow daily changes in the moisture
contents of three classes of forest fuel with different drying
rates. For each, there are two phases - one for wetting by rain
and one for drying - arranged so that the higher values represent
lower moisture contents and hence greater flammability. The final
three components are fire behavior indexes, representing rate
of spread, amount of available fuel, and fire intensity; their
values increase as fire weather severity worsens.
The system is dependent on weather only and does not consider
differences in risk, fuel, or topography. It provides a uniform
method of rating fire danger across Canada. The six components
are described below.
Fine Fuel Moisture Code (FFMC) Low
= 0 to 80.8 Moderate
= 80.9 to 86.8 High = 86.9 to 89.9 Extreme = 90.0+
A numerical rating of the moisture content of litter and other
cured fine fuels. This code is an indicator of the relative ease
of ignition and flammability of fine fuel.
Duff Moisture Code (DMC) Low
= 0.0 to 15.8 Moderate
= 15.9 to 30.8 High
= 30.9 to 50.9
Extreme
= 51.0+
A numerical rating of the average moisture content of loosely
compacted organic layers of moderate depth. This code gives an
indication of fuel consumption in moderate duff layers and medium-size
woody material.
Drought Code (DC) Low = 0.0
to 139.9 Moderate
= 140.0 to 239.9 High
= 240.0 to 340.9
Extreme
= 341.0+
A numerical rating of the average moisture content of deep, compact,
organic layers. This code is a useful indicator of seasonal drought
effects on forest fuels, and amount of smouldering in deep duff
layers and large logs.
Initial Spread Index (ISI) Low
= 0.0 to 2.1 Moderate
= 2.2 to 4.9 High
= 5.0 to 9.9
Extreme
= 10.0+
A numerical rating of the expected rate of fire spread. It combines
the effects of wind and FFMC on rate of spread without the influence
of variable quantities of fuel.
Buildup Index (BUI) Low =
0.0 to 19.9 Moderate
= 20.0 to 35.9 High
= 36.0 to 60.9
Extreme
= 61.0+
A numerical rating of the total amount of fuel available for combustion
that combines DMC and DC.
Fire Weather Index (FWI) Low
= 0.0 to 2.9 Moderate
= 3.0 to 9.9 High
= 10.0 to 22.9
Extreme
= 23.0+
A numerical rating of fire intensity that combines ISI and BUI.
It is suitable as a general index of fire danger throughout the
forested areas of Canada. |
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