Vehicles sampled per frame against weather, fire and state fields (round robin).
Burn gained per second while on fire.
Seconds a vehicle fire lasts.
Seconds of full wetness to put a fire out.
Drying rate, wetness per second.
Damage gained per second while on fire.
Fire heat (0…1) that sets a vehicle alight.
Snow melt, cover per second.
Rain everywhere, 0…1 (used when no Weather is passed to update).
Snow blown off per second above shedSpeed.
Above this speed (m/s) snow blows off.
Snowfall everywhere, 0…1.
Snow settling rate, 1/s (only below shedSpeed).
Damage above which land and sea vehicles stop.
Wetting rate towards the rain level, 1/s.
How vehicles weather: rain and snow exposure, drying, snow shed at speed, catching fire.