Observed Canadian fire danger indexes

Updated 13:00 2014-09-16

Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Agassiz 67 49 0.0 7 87.0 20.8 272.5 4.9 34.9 10.7
Badoura 68 34 0.0 7 89.9 27.6 311.9 7.4 45.2 17.0
Baudette 57 63 0.0 4 84.1 15.3 274.5 2.6 26.8 5.1
Bemidji 68 37 0.0 8 89.4 24.1 240.6 7.5 38.5 15.7
Bigstone 70 42 0.0 9 88.6 17.0 134.1 7.3 25.8 12.4
Brainerd 67 39 0.0 9 88.9 17.4 59.4 7.6 20.1 11.3
Camp Ripley/Little Falls 67 39 0.0 8 88.9 15.0 43.6 7.0 16.1 9.5
Carlos Avery 66 42 0.0 7 88.3 15.5 156.3 5.9 24.8 10.3
Cass Lake 68 35 0.0 10 89.6 22.7 325.5 9.1 38.7 18.3
Cutfoot 69 39 0.0 4 88.7 24.1 330.3 4.9 40.7 11.7
Detroit Lakes 68 34 0.0 8 90.0 24.7 258.7 8.2 39.9 17.2
Effie 65 42 0.0 9 87.8 16.3 272.2 6.5 28.4 11.9
Ely 65 43 0.0 14 86.9 12.8 198.6 8.6 22.0 13.1
Fernberg 65 48 0.0 8 82.3 6.2 192.5 2.8 11.5 3.2
Grand Portage 58 61 0.0 6 79.6 6.3 149.4 1.8 11.4 1.6
Hibbing 65 47 0.0 13 86.9 13.2 270.5 7.8 23.6 12.6
Hill City 67 41 0.0 8 88.4 15.2 244.8 6.5 26.3 11.5
Isabella 65 43 0.0 7 87.0 10.0 164.7 4.9 17.3 7.2
Itasca 68 38 0.0 5 89.1 24.6 281.3 5.7 40.4 13.0
Kelliher 64 48 0.0 9 86.8 13.9 253.2 5.7 24.5 9.9
Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Kittson 63 50 0.0 3 82.7 18.3 279.1 2.0 31.5 4.3
Litchfield 65 43 0.0 8 86.4 13.9 171.2 4.9 23.1 8.5
Littlefork 61 57 0.0 4 83.0 12.5 241.3 2.2 22.2 3.8
Meander USFS 66 42 0.0 7 83.9 13.6 316.9 3.2 24.5 5.9
MN Valley 66 45 0.0 6 85.8 21.6 312.3 3.8 36.8 8.9
Moose Lake 67 38 0.0 11 89.0 12.7 164.2 9.0 21.2 13.4
Mora 66 45 0.0 10 87.8 13.8 28.7 7.1 13.7 8.8
Orr 66 43 0.0 8 85.0 15.0 323.7 4.0 26.9 7.8
Redstn 66 51 0.0 5 78.7 9.9 247.4 1.5 18.1 1.9
Rice Lake 66 44 0.0 9 87.8 13.8 48.9 6.5 16.2 8.9
Roseau 57 64 0.0 3 81.7 20.9 399.8 1.8 36.9 4.3
Saginaw 66 41 0.0 9 88.2 14.8 213.8 6.8 25.2 11.7
Seagull Lake 62 51 0.0 8 84.8 10.9 157.7 3.9 18.7 6.1
Sherburne 67 42 0.0 7 88.4 14.2 86.8 6.0 20.2 9.4
St. Croix 66 41 0.0 6 88.6 13.6 28.3 5.7 13.5 7.2
Voyageurs/Kabnam 60 57 0.0 4 82.2 13.5 227.0 2.0 23.5 3.6

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.