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A comment on Ask HN: How are wildfires propagating when hotspots are far apart from ech othr?.
Birds can carry burning twigs (deliberately to spread fires to flush out prey).
Arsonists.
Lightning strikes.
Electrical problems: sparks, wires rubbing on trees, faulty wires, broken wires lying on the ground, etc.
Broken glass acting as magnifying glasses.
There are plenty of reasons for wide-spread outbreaks when conditions are 'just right' over extended areas for fires.
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Birds can carry burning twigs (deliberately to spread fires to flush out prey).
Arsonists.
Lightning strikes.
Electrical problems: sparks, wires rubbing on trees, faulty wires, broken wires lying on the ground, etc.
Broken glass acting as magnifying glasses.
There are plenty of reasons for wide-spread outbreaks when conditions are 'just right' over extended areas for fires.