Observed Canadian fire danger indexes

Updated 13:00 2015-03-28

Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Badoura 41 38 0.0 12 86.7 10.1 344.4 7.1 18.9 10.4
Baudette 40 39 0.0 14 81.2 7.8 93.0 4.0 12.9 5.0
Bemidji 40 37 0.0 17 86.6 14.6 177.4 10.6 24.2 16.2
Bigstone 44 52 0.0 13 83.5 15.8 185.9 4.9 26.1 9.1
Brainerd 41 36 0.0 11 87.2 15.2 101.8 7.0 22.1 11.2
Camp Ripley/Little Falls 42 37 0.0 14 86.8 18.9 76.2 8.4 23.3 13.3
Carlos Avery 41 32 0.0 8 85.3 17.4 167.5 4.2 27.6 8.2
Cass Lake 41 33 0.0 12 86.9 14.3 278.6 7.3 25.3 12.3
Cutfoot 40 34 0.0 6 85.6 8.3 197.7 3.7 15.1 5.1
Detroit Lakes 41 51 0.0 17 84.8 15.9 283.1 8.1 27.9 14.1
Effie 40 30 0.0 14 85.6 8.9 176.6 7.2 15.7 9.5
Ely 39 23 0.0 12 87.4 7.4 23.5 7.8 8.3 7.5
Fernberg 40 22 0.0 7 85.2 6.9 16.2 3.8 6.9 3.3
Grand Portage 38 39 0.0 7 79.5 4.7 118.9 1.9 8.5 1.3
Hibbing 39 25 0.0 13 81.6 5.5 206.2 3.9 10.4 4.3
Hill City 40 25 0.0 9 87.1 8.6 140.4 5.9 14.9 7.8
Isabella 40 24 0.0 5 86.2 6.2 182.0 3.7 11.5 4.3
Itasca 41 43 0.0 12 85.7 16.0 279.1 6.2 28.0 11.4
Kelliher 41 36 0.0 11 84.9 12.9 146.5 5.1 21.1 8.3
Kittson 40 60 0.0 18 76.1 7.9 306.0 3.5 14.8 4.8
Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Litchfield 39 46 0.0 16 82.6 11.8 156.1 5.6 19.8 8.7
Littlefork 42 23 0.0 13 86.4 8.3 127.4 7.3 14.2 9.2
Meander USFS 40 22 0.0 6 81.2 4.8 62.1 2.1 8.1 1.5
MN Valley 40 41 0.0 9 86.2 22.4 141.6 5.1 32.1 10.6
Moose Lake 41 20 0.0 9 88.0 11.7 115.6 6.7 18.7 9.9
Mora 41 32 0.0 10 86.1 19.0 45.4 5.5 19.0 8.4
Orr 41 25 0.0 10 85.7 7.5 174.1 5.2 13.5 6.6
Redstn 44 58 0.0 9 82.9 18.6 109.0 3.3 26.0 6.3
Rice Lake 41 23 0.0 4 86.5 12.4 43.9 3.6 14.5 4.8
Roseau 40 51 0.0 19 81.6 7.7 249.4 6.3 14.2 8.1
Saginaw 40 23 0.0 7 84.4 5.7 34.5 3.4 8.1 3.2
Seagull Lake 41 22 0.0 8 85.8 8.5 237.1 4.5 15.6 6.2
Sherburne 42 34 0.0 11 86.5 21.0 159.7 6.3 31.7 12.4
St. Croix 40 24 0.0 10 87.3 19.1 38.6 6.6 19.0 9.8
Voyageurs/Kabnam 40 24 0.0 8 82.0 5.8 43.3 2.7 8.7 2.5

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.