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Table 1 Percent of days by potential fire behavior for fire weather index (FWI) zones of Canada (from Simard 1973).

From: Burning at the Edge: Integrating Biophysical and Eco-Cultural Fire Processes in Canada’s Parks and Protected Areas

Zone (FWI map color code)

Mean FWI

Percent days by fire behavior and map fire zone

No fire

Smoldering

Light surface

Moderate surface

Hot surface

Torching

Crown fire

Conflagration

1- Minimal (blue green)

0–2

65

34

1

     

2- Very low (dark green)

2–4

40

50

7

3

    

3- Low (light green)

4–6

31

44

15

5

4

1

  

4- Moderate (yellow)

6–10

20

40

20

10

7

2

1

 

5- High (orange)

10–14

15

40

10

15

10

7

2

1

6- Very high (light red)

14–20

5

30

10

20

15

15

3

2

7- Extreme (red)

20+

 

25

7

10

13

20

15

10