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Rocky Mountain Red Flag Criteria

Rocky Mountain Red Flag Criteria

One or more of the following conditions, in conjunction with fuel characteristics (as determined by fire management) for any 3 hours or more in a 12 hour period.

  • Frequent wind gusts of 25 mph or greater - AND - relative humidity of 15% or lower.
  • Dry Thunderstorms - 15% coverage or more, constituting a Lightning Activity Level of 6.

In addition to the basic criteria above, a combination of other elements may result in Red Flag Conditions. These elements include - a Haines Index of 5 or 6, wind shifts associated with cold frontal passages or other significant wind shifts, microburst winds, the first significant lightning event (wet or dry, with 15% thunderstorm coverage or greater) after an extended hot and dry period, and poor RH recovery.


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