--    the gfirst laid cloud has to decay away before this is this really

--    the first laid cloud has to decay away before this is this really

-- Comibining these different methods, along with varying the differrent

-- Combining these different methods, along with varying the different

-- cloud_type: The name of the cloud type to use.  Defaults to "thin mist".

-- cloud_type: The name of the cloud type to use.  Possible cloud types are:
--     flame, noxious fumes, freezing vapour, poison gases,
--     grey smoke, blue smoke, purple smoke, steam, 
--     foul pestilence, black smoke, thin mist (the default).

--     and exterme values less likely.  Defaults to 1.

--     and extreme values less likely.  Defaults to 1.