Observed Canadian fire danger indexes

Updated 13:00 2015-03-26

Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Badoura 30 37 0.0 9 82.4 9.2 343.8 3.1 17.2 4.6
Baudette 24 45 0.04 8 57.9 7.1 92.5 0.7 11.9 0.5
Bemidji 27 40 0.0 12 80.8 13.9 176.9 3.3 23.2 5.9
Bigstone 33 58 0.0 13 73.3 14.9 185.0 2.0 24.8 3.7
Brainerd 31 43 0.0 13 84.1 14.4 101.2 5.3 21.2 8.6
Camp Ripley/Little Falls 29 55 0.0 10 82.6 18.1 75.5 3.4 22.6 6.0
Carlos Avery 33 48 0.0 11 72.5 16.5 166.9 1.7 26.5 3.1
Cass Lake 28 41 0.0 7 80.2 13.5 278.0 2.1 24.1 3.7
Cutfoot 29 40 0.02 4 77.0 7.7 197.2 1.2 14.0 0.9
Detroit Lakes 29 49 0.01 15 82.3 15.3 282.5 5.0 27.0 9.4
Effie 25 49 0.02 9 72.2 8.2 176.1 1.4 14.7 1.3
Ely 22 40 0.04 10 77.0 10.9 286.2 2.0 19.9 3.0
Fernberg 20 46 0.04 11 68.3 7.1 245.9 1.4 13.2 1.1
Grand Portage 27 35 0.13 9 59.2 4.2 118.6 0.8 7.8 0.4
Hill City 27 44 0.01 7 76.5 7.7 139.9 1.5 13.5 1.3
Isabella 22 44 0.04 11 71.6 5.4 181.5 1.6 10.1 1.0
Itasca 27 42 0.01 7 81.2 15.3 278.5 2.3 26.9 4.5
Kelliher 27 42 0.0 9 73.5 12.1 145.9 1.5 20.0 2.0
Kittson 27 57 0.06 13 51.4 7.5 305.5 0.6 14.2 0.4
Litchfield 33 59 0.0 13 68.6 11.2 155.7 1.7 19.0 2.4
Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Littlefork 25 43 0.02 10 69.6 7.3 126.7 1.4 12.8 1.0
Meander USFS 25 37 0.13 5 56.1 6.5 241.6 0.5 12.2 0.3
MN Valley 35 53 0.0 10 83.2 21.6 141.1 3.7 31.3 7.9
Moose Lake 30 35 0.0 12 77.5 10.9 115.0 2.4 17.6 3.5
Mora 31 47 0.0 11 75.8 18.2 44.8 2.0 18.2 2.8
Orr 23 44 0.02 9 69.3 6.7 173.5 1.3 12.2 0.9
Redstn 34 64 0.0 9 74.4 17.8 108.1 1.5 25.3 2.7
Rice Lake 29 43 0.0 12 74.8 11.5 43.3 2.0 13.8 2.3
Roseau 28 37 0.0 11 66.7 7.2 248.9 1.4 13.4 1.0
Saginaw 27 42 0.04 7 64.7 4.9 34.0 0.9 7.2 0.5
Seagull Lake 22 45 0.06 8 68.6 7.7 236.5 1.1 14.3 0.8
Sherburne 32 47 0.0 10 77.9 20.1 159.0 2.1 30.5 4.5
St. Croix 33 39 0.0 10 77.5 18.3 38.1 2.0 18.2 3.0
Voyageurs/Kabnam 25 41 0.09 6 58.2 5.1 42.8 0.6 7.8 0.3

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.