Observed Canadian fire danger indexes

Updated 12:00 2016-12-08

**Local agency personnel should contact MIFC Fire Intelligence if errors or omissions are observed.**

Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Agassiz 18 72 0.0 12 62.8 5.9 228.4 1.3 11.1 0.8
Albert Lea 21 79 0.0 16 75.8 7.3 94.9 3.0 12.2 3.5
Badoura 20 67 0.0 9 77.3 43.5 221.7 1.8 58.4 6.2
Baudette 20 70 0.0 8 70.1 4.1 110.7 1.2 7.5 0.6
Bemidji 18 72 0.0 11 65.3 2.1 226.9 1.3 4.1 0.5
Bigstone 16 74 0.0 18 73.6 1.1 97.4 3.1 2.1 1.0
Camp Ripley/Little Falls 20 67 0.0 9 75.4 2.1 112.9 1.6 4.0 0.6
Carlos Avery 23 65 0.0 12 69.9 0.0 0.0 1.6 0.0 0.3
Cass Lake 21 69 0.0 6 56.5 0.0 180.1 0.5 0.0 0.1
Cutfoot 22 75 0.0 2 54.4 0.0 134.1 0.3 0.0 0.1
Detroit Lakes 15 86 0.0 15 70.3 2.6 150.7 2.1 5.0 0.9
Effie 21 76 0.0 9 61.1 1.9 197.9 0.9 3.7 0.3
Ely 21 74 0.0 8 62.4 0.2 98.4 0.9 0.4 0.2
Fernberg 20 79 0.0 12 50.7 0.2 178.6 0.5 0.4 0.1
Grand Portage 23 79 0.01 3 58.5 0.0 0.2 0.5 0.0 0.1
Hibbing 21 72 0.0 12 61.9 0.0 61.6 1.2 0.0 0.2
Hill City 22 67 0.0 10 61.9 0.0 143.1 1.0 0.0 0.2
Isabella 20 84 0.0 6 50.4 0.0 3.4 0.3 0.0 0.1
Itasca 18 75 0.0 8 67.4 1.3 241.7 1.1 2.6 0.4
Kelliher 21 80 0.0 8 63.2 5.4 199.5 0.9 10.1 0.6
Station °F RH P24I Wind FFMC DMC DC ISI BUI FWI
Kittson 17 83 0.0 12 54.5 0.7 158.0 0.7 1.4 0.2
Litchfield 21 69 0.0 18 71.6 1.3 30.5 2.8 2.3 0.9
Littlefork 21 68 0.0 11 62.6 1.5 132.8 1.2 2.9 0.4
Meander USFS 20 83 0.0 4 53.7 0.4 72.6 0.3 0.8 0.1
MN Valley 23 73 0.0 14 72.2 0.1 0.5 2.1 0.1 0.4
Moose Lake 22 71 0.0 12 61.3 0.0 117.9 1.2 0.0 0.2
Mora 24 65 0.0 15 69.0 0.5 47.8 2.0 1.0 0.5
New Ulm Municipal Airport 17 73 0.0 22 79.6 2.8 39.9 6.5 4.8 4.9
Orr 23 69 0.0 10 67.0 0.1 103.1 1.3 0.2 0.3
Redstn 15 77 0.0 15 71.1 6.0 164.2 2.2 11.0 2.2
Rice Lake 22 69 0.0 10 61.9 0.0 109.8 1.0 0.0 0.2
Rochester 19 86 0.06 22 48.2 0.0 13.8 0.8 0.0 0.2
Roseau 18 69 0.0 8 72.3 2.2 215.1 1.3 4.3 0.5
Saginaw 22 73 0.0 8 63.1 0.0 214.5 0.9 0.0 0.2
Seagull Lake 22 70 0.0 9 49.8 0.0 108.5 0.3 0.0 0.1
Sherburne 22 67 0.0 11 74.4 0.0 27.6 1.8 0.0 0.4
Skibo 21 75 0.0 6 61.7 4.1 109.1 0.7 7.5 0.4
St. Croix 25 64 0.0 8 66.5 0.0 75.6 1.1 0.0 0.2
Voyageurs/Kabnam 23 67 0.0 6 63.1 0.0 27.7 0.8 0.0 0.2

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.