Observed Canadian fire danger indexes

Updated 13:00 2014-07-29

Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Agassiz 74 57 0.0 9 84.8 16.9 48.6 4.2 18.1 6.4
Badoura 74 49 0.0 7 85.5 26.1 155.2 4.0 36.8 9.2
Baudette 76 49 0.0 6 88.1 29.5 83.1 5.3 31.2 10.7
Bemidji 75 47 0.0 10 87.6 25.4 113.6 6.9 32.6 13.5
Bigstone 76 52 0.0 8 87.5 32.3 234.9 5.7 48.1 14.4
Brainerd 76 51 0.0 9 88.7 30.1 170.3 7.4 41.8 16.3
Camp Ripley/Little Falls 78 49 0.0 8 88.4 43.7 159.4 6.6 51.9 16.7
Carlos Avery 75 53 0.0 7 88.2 33.9 181.2 5.9 46.2 14.4
Cass Lake 75 48 0.0 8 86.6 19.0 162.2 5.0 29.3 9.9
Cutfoot 77 50 0.0 4 87.8 26.7 153.5 4.3 37.2 10.0
Detroit Lakes 73 50 0.0 10 86.8 32.7 186.9 6.1 45.5 14.7
Effie 75 47 0.0 11 86.3 16.4 112.7 6.1 24.1 10.5
Ely 73 56 0.01 10 84.2 16.0 167.1 4.2 25.8 7.9
Fernberg 70 63 0.05 8 78.4 16.6 148.4 1.9 26.0 3.5
Grand Portage 69 70 0.29 6 54.0 6.6 46.0 0.4 9.8 0.2
Hibbing 75 44 0.0 0 74.1 20.5 219.2 0.7 33.2 0.9
Hill City 76 51 0.0 5 86.9 17.2 174.1 4.1 27.6 8.0
Isabella 71 54 0.06 8 78.4 17.1 141.7 1.9 26.3 3.5
Itasca 73 53 0.0 5 84.5 21.1 138.9 3.0 30.6 6.3
Kelliher 74 54 0.0 8 85.5 17.0 140.0 4.3 26.1 8.1
Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Kittson 76 49 0.0 6 86.4 22.4 86.0 4.2 27.1 8.0
Litchfield 76 47 0.0 9 84.4 20.2 221.9 4.0 32.9 8.7
Littlefork 76 49 0.0 9 86.8 17.4 92.3 5.6 23.6 9.7
Meander USFS 72 57 0.23 5 65.2 15.0 150.7 0.8 24.1 0.8
Mille Lacs WMA 74 53 0.0 8 87.0 18.7 177.8 5.3 29.6 10.4
MN Valley 77 49 0.0 8 88.1 34.0 220.9 6.3 49.1 15.6
Moose Lake 76 53 0.0 8 83.2 18.1 206.9 3.2 29.7 6.7
Mora 76 53 0.0 11 87.4 23.0 122.0 7.2 31.3 13.7
Orr 76 56 0.03 8 83.9 17.1 131.4 3.5 25.8 6.6
Redstn 73 58 0.0 6 84.7 21.3 233.7 3.3 34.6 7.6
Rice Lake 77 48 0.0 10 85.9 23.0 163.0 5.4 34.0 11.4
Roseau 76 47 0.0 7 88.0 27.7 163.9 5.7 38.9 12.8
Saginaw 75 50 0.0 6 79.9 11.5 177.7 1.8 19.8 2.7
Seagull Lake 72 66 0.04 7 78.9 14.9 175.2 1.8 24.5 3.2
Sherburne 78 51 0.0 7 88.0 35.3 204.2 5.7 49.3 14.6
St. Croix 78 47 0.0 8 87.4 29.0 209.6 5.6 43.1 13.4
Voyageurs/Kabnam 76 52 0.04 6 83.1 15.7 46.3 2.7 17.0 3.9

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.