• Wooden construction and wood shake roofs
• Poor access and narrow one-way roads
• Inadequate water supply
• Natural fuels 30 feet or closer to structures
• Extreme fire behavior
• Strong winds
• Evacuation of public (panic)
• Structures located in box canyons, chimneys, steep slopes in flashy fuels
• Bridge load limits

Indicators of Extreme Fire Behavior

• A rapid increase in the fire's intensity
• High, sustained rate of spread
• Well-developed convection column
• Long-distance spotting (over 600 feet)
• Fire whirlwinds or horizontal flame sheeting
• Sudden calming of the wind

Whenever any of these indicators are observed on a wildland fire operation, WATCH OUT!