Red Flag Warning issued for Monday and Tuesday, Haines Index 6

The National Weather Service has issued a Red Flag Warning through 9:00 PM tonight, and from 8:00 AM to 9:00 PM Tuesday. Due to a Hains level 6 over the Cutoff Fire.

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RED FLAG WARNING REMAINS IN EFFECT UNTIL 9:00 PM PDT THIS EVENING FOR HAINES 6 WITH CUTOFF FIRE. RED FLAG WARNING IN EFFECT FROM 8:00 AM TO 9:00 PM PDT TUESDAY FOR HAINES 6 WITH CUTOFF FIRE

A Haines Index of 6 is forecast over the Cutoff Fire today and again Tuesday. Very dry and unstable conditions will support extreme fire behavior. Plume domination is possible with locally generated erratic and gusty winds. Spotting could be problematic.

Affected area: Fire Weather Zone 624 over the Cutoff Fire.

Haines Index: 6
A Haines Index is used to indicate the potential for wildfire growth by measuring the stability and dryness of the air over a fire. It is calculated by combining the stability and moisture content of the lower atmosphere into a number that correlates well with large fire growth. The stability term is determined by the temperature difference between two atmospheric layers; the moisture term is determined by the temperature and dew point difference. This index has been shown to be correlated with large fire growth on initiating and existing fires where surface winds do not dominate fire behavior.

  • 2: Very Low Potential -- (Moist Stable Lower Atmosphere)

  • 3: Very Low Potential

  • 4: Low Potential

  • 5: Moderate Potential

  • 6: High Potential ------ (Dry Unstable Lower Atmosphere)

Wind: Southeast 10 mph gusting to 20 mph today becoming southwest 10 mph this evening, then becoming light. Light winds Tuesday morning becoming southwest 10 mph Tuesday afternoon.

Humidity: As low as 9% in the late afternoon.

Source: National Weather Service, Medford, Oregon.


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