• An extremely dense surface fog (water droplets suspended in the atmosphere) at the site of combustion that reduces visibility to less than three meters (ten feet).
    • Definition Extension: Superfog forms at the site of combustion when warm humid smoke from smoldering combustion mixes with cold humid air. It is sometimes referred to as “whiteout events”. Superfog is the most severe case of smoke-induced fog. Superfog may last for a few seconds to a few hours depending of the dryness of the ambient air. Thus, superfog may not last more than a few meters (feet) beyond the site of combustion or, under certain wind conditions, it may be carried several kilometers (miles). Superfog presence is most likely late at night or early in the morning in low-lying basins or drainages when/where ambient conditions favor fog persistence.
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