Observed Canadian fire danger indexes

Updated 13:00 2014-08-01

Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Agassiz 78 49 0.0 6 88.6 26.3 73.4 5.7 27.7 10.7
Badoura 80 42 0.02 5 89.3 36.5 180.2 5.9 48.4 14.7
Baudette 79 39 0.0 4 90.3 40.4 108.2 6.2 41.8 14.2
Bemidji 79 42 0.0 7 89.7 35.8 138.6 7.3 43.5 16.4
Bigstone 83 51 0.0 6 89.0 42.3 260.6 6.1 60.2 17.1
Brainerd 69 76 0.06 8 76.7 37.1 194.6 1.6 50.3 5.0
Camp Ripley/Little Falls 81 49 0.0 6 89.6 54.4 185.1 6.6 62.7 18.6
Carlos Avery 82 44 0.0 3 89.5 43.9 206.7 5.1 57.3 14.6
Cass Lake 79 39 0.0 5 90.2 29.4 187.1 6.6 42.2 14.9
Cutfoot 79 46 0.0 2 89.1 36.9 178.8 4.4 48.6 11.8
Detroit Lakes 81 42 0.0 10 89.9 43.3 212.1 9.5 57.3 23.0
Effie 78 49 0.0 4 89.2 26.1 137.3 5.3 35.4 11.5
Ely 76 41 0.0 5 87.9 19.7 191.0 4.8 31.4 9.8
Fernberg 76 42 0.0 7 89.1 22.7 172.4 6.7 34.1 13.5
Grand Portage 69 57 0.0 8 85.5 13.0 69.2 4.3 17.7 6.4
Hibbing 77 49 0.0 0 87.9 30.0 243.8 3.2 45.9 8.7
Hill City 82 46 0.0 3 89.0 26.5 199.5 4.8 39.7 11.2
Isabella 74 43 0.0 4 88.1 21.5 164.9 4.5 32.4 9.5
Itasca 79 47 0.02 4 88.2 30.3 163.6 4.6 41.4 11.1
Kelliher 79 51 0.0 3 88.5 26.3 165.0 4.4 37.6 10.3
Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Kittson 80 43 0.0 3 89.4 32.3 111.2 5.1 37.4 11.4
Litchfield 81 51 0.0 7 88.3 29.6 247.2 5.9 45.5 14.4
Littlefork 79 42 0.0 4 89.3 21.0 110.4 5.4 28.5 10.3
Meander USFS 77 42 0.0 4 89.2 24.2 175.0 5.3 35.9 11.5
Mille Lacs WMA 80 53 0.0 4 87.8 27.5 202.9 4.3 41.0 10.6
MN Valley 82 50 0.0 6 88.7 43.6 246.4 5.8 60.4 16.4
Moose Lake 82 45 0.0 2 84.9 16.7 212.2 2.4 28.0 4.9
Mora 83 46 0.0 3 89.2 32.5 147.5 4.9 41.9 11.7
Orr 79 48 0.0 4 88.6 26.2 156.1 4.8 36.9 10.9
Redstn 81 48 0.0 3 88.8 31.1 258.6 4.6 47.8 12.1
Rice Lake 80 51 0.0 2 87.6 25.6 183.8 3.6 38.0 8.6
Roseau 81 39 0.0 5 90.6 39.2 189.4 7.0 51.6 17.4
Saginaw 80 46 0.0 4 89.1 21.2 202.8 5.2 33.6 11.0
Seagull Lake 75 47 0.0 4 88.0 19.6 198.7 4.5 31.5 9.3
Sherburne 83 47 0.0 4 89.3 46.0 229.9 5.3 61.3 15.6
St. Croix 82 44 0.02 4 89.0 38.3 235.0 5.1 54.4 14.2
Voyageurs/Kabnam 78 42 0.0 3 88.9 20.0 66.6 4.7 22.9 8.1

Interpretation

The following chart is a statewide generalized fire danger rating chart for the Canadian Fire Weather Index. It is based on a five class danger rating system, i.e., low, moderate, high, very high , and extreme. The distribution is based on weather records from 1985 - 1998. Low days occurred 45% to 50% of the time, moderate - 30 %, high days - 12% to 15%, very high days occurred 7%-8% of the time, and extreme days were 2%-3%. This is not meant to be used as a staffing guide . Each area needs to look at its own weather data coupled with its fire occurrence data. For instance, if you have a drought code of 380, it does not mean you are in extreme fire danger. It means that the drought code only gets that high on 2% of the days between April 1 and November 1.

Index Low Moderate High Very High Extreme

FFMC

0.0 - 80.9

81.0 - 87.9

88.0 - 90.4

90.5 - 92.4

92.5+

DMC

0.0 - 12.9

13.0 - 27.9

28.0 - 41.9

42.0 - 62.9

63.0+

DC

0.0 - 79.9

80.0 - 209.9

210.0 - 273.9

274.0 - 359.9

360.0+

ISI

0.0 - 3.9

4.0 - 7.9

8.0 - 10.9

11.0 - 18.9

19.0+

BUI

0.0 - 18.9

19.0 - 33.9

34.0 - 53.9

54.0 - 76.9

77.0+

FWI

0.0 - 4.9

5.0 - 13.9

14.0 - 20.9

21.0 - 32.9

33.0+

Definitions

Fine Fuel Moisture Code (FFMC)

This provides a relative indicator of the moisture in the fine fuels. Like the 1 hour fuel moisture, it reacts directly with the air temperature and relative humidity.

Duff Moisture Code (DMC)

This is an index of the moisture of the loosely compact organic layers at a depth of 2-4 inches.

Drought Code (DC)

This measures long term dryness in the fuels. It is a longer term index than the NFDRS 1000 fuel moisture. It doesn't reflect the probability of fire occurrence by itself, but can be useful in predicting the level of mop up needed and the consumption of large fuels. It should be looked at in relation to peat fire starts.

Initial Spread Index (ISI)

This is based on the FFMC and the wind speed. It provides a relative numerical rating of the expected rate of spread. This is similar to the NFDRS Spread Component.

Buildup Index (BUI)

This index is based on the DC and the DMC. It provides a relative indication of the amount of fuel available for combustion. This is somewhat similar to the NFDRS Energy Release Component. It doesn't predict what a given day might be like, but does relate well to the dryness of the fuels.

Fire Weather Index (FWI)

This combines the BUI and the ISI to give a relative numerical rating of fire intensity. It can be compared to the NFDRS Burning Index.