<Tr> <Td> Visibility * </Td> <Td> Fair to poor in haze </Td> <Td> Poor, but improving </Td> <Td> Good, except in showers </Td> </Tr> <Tr> <Td> Dew Point </Td> <Td> High, steady </Td> <Td> Sudden drop </Td> <Td> Falling </Td> </Tr> <P> * provided there is sufficient moisture . </P> <P> If the cold front is highly unstable, cumulonimbus clouds producing thunderstorms commonly form along the front . Anvil cirrus clouds may spread a considerable distance downwind from the thunderstorms . The other cloud types associated with a cold front depend on atmospheric conditions such as air mass stability and wind shear . As the front approaches, middle - étage gives way to altostratus and low - level stratocumulus with intermittent light precipitation if the warm airmass being displaced by the cold front is mostly stable . With significant airmass instability, vertically developed cumulus or cumulonimbus with showers and thunderstorms will form along the front . </P>

When does most rain fall in the transition zone