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Dense Fog/Smoke Threat Level
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Threat Level Descriptions
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Extreme
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"An Extreme Threat to Life and Property from Dense Fog or Smoke."
Widespread very dense fog or smoke with the predominate visibility near zero and the coverage greater than 55% within a defined area, persisting for at least 1 hour.
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High
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"A High Threat to Life and Property from Dense Fog or Smoke."
Areas of very dense fog or smoke with the visibility near zero and the coverage 25 - 54% within a defined area, persisting for at least 1 hour.
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Moderate
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"A Moderate Threat to Life and Property from Dense Fog or Smoke."
Widespread dense fog or smoke with the predominate visibility 1/8 - 1/4 mile and the coverage greater than 55% within a defined area, persisting for at least 1 hour...OR...patchy very dense fog or smoke with the visibility near zero and the coverage less than 25% within a defined area, persisting for at least 1 hour. Surrounding fog may or may not be present.
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Low
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"A Low Threat to Life and Property from Dense Fog or Smoke."
Areas of dense fog or smoke with the visibility 1/8 - 1/4 mile and the coverage 25 - 54% within a defined area, persisting for at least 1 hour.
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Very Low
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" A Very Low Threat to Life and Property from Dense Fog or Smoke."
Patchy dense fog or smoke with the visibility 1/8 - 1/4 mile and the coverage less than 25% within a defined area, persisting for at least 1 hour.
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Non-Threatening
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" No Discernable Threat to Life and Property from Dense Fog or Smoke."
Visibility greater than 1/4 mile and non-threatening. Fog/smoke may still be present, but not dense.
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| Note: Fog or smoke becomes hazardous when it is considered "dense" and obscures visibility to 1/4 mile or less. This results in decreased response time for operators of motor vehicles, especially at higher speeds. Motorists should adjust driving speed accordingly, while using low-beam headlights. |
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