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Cirrus
Fair weather but change of weather expected within 24 hrs.
Cirrostratus
Usually bring precipitation within the next 9-18 hrs as front approaches.
Cirrocumulus
Fair but changing weather.
Altostratus
Usually form ahead of storms with constant rain or snow within 6-12 hrs.
Altocumulus
Can bring thunderstorms in late afternoon if the morning is warm and humid.
Stratus
Sometimes (ie risk of) drizzle or rain.
Stratocumulus
Rain rarely occurs. Slow to clear.
Nimbostratus
Showers, steady or downpours of rain or snow.
Cumulus
Fair Weather
Cumulonimbus
Heavy rain or hail with strong winds. Thunderstorms and snow storms possible.
Mammatus
Severe weather including tornadoes.
Lenticular
Clouds caused by wave wind patterns caused by mountains.
Fog
Defined as when the visability near the Earth's surface is less than 1 km due to moisture in the air.