Observed Canadian fire danger indexes

Updated 13:00 2014-09-29

Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Agassiz 55 74 0.28 6 46.1 12.0 281.3 0.2 21.8 0.2
Badoura 51 77 0.12 7 60.7 24.4 339.7 0.8 41.4 1.4
Baudette 50 74 0.45 5 39.1 7.0 211.5 0.0 12.9 0.0
Bemidji 52 70 0.22 7 52.7 16.6 259.0 0.4 28.6 0.5
Bigstone 59 71 0.0 8 85.6 22.9 190.3 4.4 35.2 9.7
Brainerd 51 81 0.29 8 44.2 16.5 111.1 0.1 24.0 0.1
Camp Ripley/Little Falls 53 78 0.2 5 49.9 18.7 102.7 0.2 25.7 0.3
Carlos Avery 55 69 0.01 7 85.8 30.9 222.2 4.1 45.8 10.9
Cass Lake 50 74 0.18 6 53.1 19.9 357.5 0.4 34.9 0.5
Cutfoot 52 72 0.15 3 55.0 19.2 350.8 0.4 33.8 0.5
Detroit Lakes 59 63 0.08 5 72.9 26.6 302.1 1.0 43.6 2.6
Effie 50 74 0.16 5 54.4 15.0 278.8 0.4 26.4 0.4
Ely 44 76 0.22 8 48.4 18.0 249.2 0.3 30.5 0.3
Fernberg 42 91 0.29 5 33.1 12.7 238.2 0.0 22.5 0.0
Grand Portage 44 76 0.28 6 43.3 9.5 179.7 0.1 16.7 0.1
Hibbing 47 80 0.16 6 51.8 14.6 273.6 0.3 25.8 0.4
Hill City 48 79 0.33 5 40.5 13.4 262.2 0.1 23.7 0.1
Isabella 45 83 0.42 5 34.5 12.4 199.1 0.0 21.4 0.0
Itasca 54 69 0.23 7 53.6 21.9 325.8 0.4 37.5 0.6
Kelliher 48 83 0.11 6 56.1 12.5 235.6 0.5 22.0 0.5
Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Kittson 51 79 0.57 6 32.7 9.5 277.6 0.0 17.5 0.0
Litchfield 55 76 0.02 10 83.9 21.7 226.8 4.1 35.0 9.1
Littlefork 48 76 0.24 5 45.0 10.6 256.5 0.1 19.2 0.1
Meander USFS 43 85 0.28 6 38.4 12.1 341.4 0.0 22.3 0.0
MN Valley 57 75 0.0 10 80.2 25.1 359.4 2.6 42.7 7.0
Moose Lake 48 82 0.31 9 42.3 13.1 194.0 0.1 22.4 0.1
Mora 53 72 0.27 8 50.9 16.2 83.0 0.4 21.7 0.3
Orr 46 79 0.2 3 45.4 16.0 356.6 0.1 28.7 0.1
Redstn 62 79 0.0 6 84.3 31.9 322.5 3.1 51.1 9.1
Rice Lake 51 77 0.2 7 51.5 16.3 97.7 0.3 23.0 0.3
Roseau 51 79 0.49 9 39.0 8.4 316.2 0.1 15.7 0.0
Saginaw 48 83 0.41 6 36.5 11.6 211.7 0.0 20.3 0.0
Seagull Lake 43 79 0.52 7 35.6 10.9 184.0 0.0 19.0 0.0
Sherburne 54 71 0.06 8 75.3 30.9 156.2 1.5 41.4 3.9
St. Croix 54 65 0.23 6 54.8 17.8 83.1 0.4 23.2 0.4
Voyageurs/Kabnam 46 81 0.34 4 36.0 9.1 226.8 0.0 16.5 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.