natural_disaster_fire_spaced_impact_events_effect

natural_disaster_fire_spaced_impact_events_effect = {
	natural_disaster_impact_effect = yes

	# Event for travellers through the affected region
	every_situation_sub_region = {
		every_situation_sub_region_county = {
			every_county_province = {
				every_character_in_location = {
					trigger_event = natural_disaster_flavor_events.0005
				}
			}
		}
	}

	# Later random impact/death events
	trigger_event = {
		id = natural_disaster.9010 # Random
		days = 7
	}
	trigger_event = {
		id = natural_disaster.9010 # Random
		days = 14
	}
	trigger_event = {
		id = natural_disaster.9010 # Random
		days = 21
	}
}

As written in game/common/scripted_effects/10_dlc_tgp_natural_disaster_scripted_effects.txt.