Accidents, combat and negative storms can cause fire. For each 10 damage caused there is a 1% chance a fire will start. Fire has a 10% chance of dissipating with each action. Lots with a building or at least 1 vehicle have an additional 5% chance of fire spreading to it.

CHANCE OF FIRE SPREADING TO ADJACENT LOT

Barren:	5%
Bosk:	10%
Desert:	5%
Field:	10%
Forest:	15%
Jungle:	20%
Lode:	5%
Marsh:	5%
Meadow:	5%
Ocean:	n/a
Plain:	5%
Quarry:	5%
Sea:	n/a
Shoal:	n/a
Steppe:	5%
Swamp:	5%
Wasteland:	20%
Wastewater:	10%
Waterway:	n/a