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1/ #WlldlandFire @RateofSpread? What is #ROS? @CAL_FIRE definition: ROS defined as rate at the flame front advances thru the fuel. Can be measured in MPH or feet per minute, etc.
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2/ • Measurement Terms of ROS
• Low (slow) - very little spread, spread of no consequence
• Moderate - spread less than 1 MPH
• Dangerous - spread is 1-3 MPH
• Critical - over 3 MPH
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• Low (slow) - very little spread, spread of no consequence
• Moderate - spread less than 1 MPH
• Dangerous - spread is 1-3 MPH
• Critical - over 3 MPH
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3/ • The ROS influences the choice and timing of control actions.
• The ROS influences safety.
- How soon will the fire threaten personnel or equipment?
- When might potential escape routes be cut off?
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• The ROS influences safety.
- How soon will the fire threaten personnel or equipment?
- When might potential escape routes be cut off?
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4/ ROS related to how fast you can walk & maybe escape a rapidly spreading wildfire. A person walking fast at 4 MPH covers 352 ft in one minute. If slope is in play & walking speed reduces to 2 MPH, the #FF will cover 176 ft in one minute.
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5/ Focus on a Critical ROS fire burning at 3 or 3+ MPH & think if you can out walk or run the fire. Naw. Won& #39;t happen particularly light flashy fuels like grass fires. You must be on your game. Fire burns 17 times faster uphill than downhill without any wind advantage.
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6/ You must be on your game & consider ROS vs. your ability to find a #TemporaryRefugeArea or #SafetyZone. Fire won& #39;t quit, won& #39;t get winded, doesn& #39;t tire when the slope increases & won& #39;t give up...
Summary of ROS
