Observed Canadian fire danger indexes

Updated 12:00 2014-12-20

Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Agassiz 29 99 0.0 11 57.3 16.5 311.1 0.8 29.1 1.0
Badoura 29 99 0.0 7 64.6 17.8 404.3 0.9 32.1 1.5
Baudette 30 98 0.0 4 66.4 1.4 165.1 0.8 2.7 0.3
Bemidji 29 91 0.0 5 71.7 12.1 297.5 1.0 22.0 1.0
Bigstone 33 84 0.0 8 77.3 21.9 280.6 1.7 36.7 4.1
Brainerd 30 100 0.0 10 53.7 3.1 154.5 0.6 5.9 0.3
Camp Ripley/Little Falls 30 100 0.0 9 43.0 2.4 154.3 0.1 4.6 0.1
Carlos Avery 32 87 0.0 6 60.6 10.1 256.6 0.7 18.4 0.6
Cass Lake 29 95 0.02 7 70.0 14.0 384.6 1.1 25.7 1.6
Cutfoot 30 100 0.0 4 48.5 2.7 327.9 0.2 5.3 0.1
Detroit Lakes 29 98 0.0 12 69.3 13.9 362.3 1.6 25.4 2.9
Effie 29 100 0.0 6 69.7 7.4 309.5 1.0 14.0 0.7
Ely 29 85 0.01 8 66.7 4.6 283.1 1.1 8.8 0.6
Fernberg 28 98 0.0 6 43.7 2.4 252.7 0.1 4.7 0.0
Grand Portage 30 95 0.0 3 28.5 0.0 152.0 0.0 0.0 0.0
Hibbing 29 94 0.0 8 64.7 2.1 255.2 1.0 4.1 0.4
Hill City 29 100 0.0 5 61.4 4.0 247.7 0.7 7.7 0.4
Isabella 27 95 0.0 4 46.0 0.0 176.3 0.1 0.0 0.0
Itasca 28 100 0.0 4 70.7 26.0 404.0 0.9 44.8 2.1
Kelliher 30 95 0.0 6 69.0 5.3 232.0 1.0 10.0 0.6
Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Kittson 28 100 0.0 9 71.1 17.8 325.4 1.3 31.3 2.7
Litchfield 30 99 0.0 11 41.5 6.1 266.6 0.1 11.5 0.1
Littlefork 29 94 0.0 4 62.4 1.0 265.1 0.6 2.0 0.2
Meander USFS 29 91 0.0 3 43.4 0.0 276.3 0.1 0.0 0.0
MN Valley 32 86 0.0 9 76.8 43.2 249.7 1.8 60.3 6.2
Moose Lake 31 86 0.0 4 53.0 0.0 172.9 0.3 0.0 0.1
Mora 31 97 0.0 8 48.7 2.3 108.3 0.3 4.4 0.1
Orr 29 91 0.0 6 62.9 2.8 343.9 0.8 5.5 0.4
Redstn 30 100 0.0 6 21.3 10.1 315.9 0.0 18.7 0.0
Rice Lake 29 100 0.0 0 22.1 0.0 113.1 0.0 0.0 0.0
Roseau 29 95 0.0 9 74.5 12.4 341.7 1.5 22.7 2.5
Saginaw 28 89 0.0 5 50.4 0.0 154.3 0.3 0.0 0.1
Seagull Lake 31 85 0.0 4
Sherburne 31 98 0.0 8 44.7 5.1 221.0 0.1 9.6 0.1
St. Croix 32 81 0.0 6 56.9 1.3 72.3 0.5 2.5 0.2
Voyageurs/Kabnam 29 90 0.0 3 51.1 0.0 200.7 0.2 0.0 0.0

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.