Observed Canadian fire danger indexes

Updated 13:00 2014-08-19

Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Agassiz 73 74 0.0 5 80.0 35.8 159.1 1.7 45.8 4.8
Badoura 77 55 0.01 7 73.6 25.7 237.4 1.3 40.5 3.1
Baudette 72 70 0.12 5 61.3 15.7 146.7 0.7 24.7 0.7
Bemidji 72 67 0.33 9 54.8 10.9 153.2 0.6 18.5 0.5
Bigstone 81 61 0.0 7 85.7 29.8 152.6 4.1 40.0 9.9
Brainerd 69 89 0.57 6 26.5 3.9 55.0 0.0 6.7 0.0
Camp Ripley/Little Falls 78 63 0.03 5 79.8 15.2 103.4 1.7 22.3 2.7
Carlos Avery 74 67 0.04 7 79.0 38.9 258.3 1.8 56.5 6.0
Cass Lake 72 73 0.35 4 43.7 15.3 266.6 0.1 26.8 0.1
Cutfoot 72 77 0.52 2 33.9 21.0 259.5 0.0 35.0 0.0
Detroit Lakes 76 64 0.35 9 61.8 15.4 241.4 0.9 26.6 1.2
Effie 70 74 0.12 4 59.3 26.7 240.9 0.5 41.8 0.8
Ely 63 86 0.74 4 30.5 5.6 178.8 0.0 10.5 0.0
Fernberg 64 90 0.37 3 30.0 7.3 197.5 0.0 13.3 0.0
Grand Portage 60 96 0.21 5 19.3 12.1 168.1 0.0 20.5 0.0
Hill City 71 72 0.1 6 53.9 9.3 242.5 0.4 16.9 0.3
Isabella 61 94 0.6 5 11.7 3.1 174.0 0.0 5.9 0.0
Itasca 73 68 0.25 5 48.1 6.6 194.8 0.2 12.2 0.1
Kelliher 70 82 0.79 4 34.6 9.5 177.0 0.0 16.8 0.0
Kittson 77 65 0.03 3 63.7 44.3 228.0 0.6 59.6 1.7
Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Litchfield 79 67 0.0 7 79.3 11.4 282.4 1.9 20.6 2.9
Littlefork 69 78 0.04 5 76.9 27.4 188.8 1.3 40.2 3.2
Meander USFS 62 88 0.05 3 66.9 20.3 256.6 0.7 34.0 0.9
Mille Lacs WMA 73 69 0.0 3 60.8 11.0 192.2 0.5 19.3 0.5
MN Valley 76 70 0.02 7 77.9 37.4 240.3 1.6 53.8 5.2
Moose Lake 72 71 0.62 6 42.3 6.3 202.3 0.1 11.7 0.1
Mora 73 68 0.0 7 68.3 10.7 186.9 1.0 18.7 0.9
Orr 68 73 0.03 7 80.5 43.5 262.3 2.1 61.5 7.3
Redstn 81 57 0.2 7 73.2 12.3 277.0 1.2 22.1 1.7
Rice Lake 73 69 0.53 4 43.0 4.1 144.7 0.1 7.7 0.0
Roseau 72 76 0.06 3 68.8 75.5 325.3 0.8 95.6 3.6
Saginaw 69 82 1.06 4 26.4 5.1 127.1 0.0 9.3 0.0
Seagull Lake 64 87 0.44 4 33.9 8.1 199.3 0.0 14.7 0.0
Sherburne 76 68 0.64 3 51.1 18.3 231.1 0.2 30.6 0.3
St. Croix 73 70 0.0 5 77.0 41.5 306.6 1.3 62.0 4.6
Voyageurs/Kabnam 67 80 0.04 3 75.2 34.2 172.4 1.0 45.8 2.6

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.