0 a type of flat, grey cloud found at the lowest level, below all other cloud types, and causing dull weather or light rain -- 層雲（一種扁平的灰色雲，低於所有其他類型的雲，可引起陰沉的天氣或小雨）
Most (>90%) events where u 2 m s-1 were individual precipitation and/or cloud water events which originated from stratus or strato-cumulus clouds during the transition and dry seasons.
They were mushroom shaped, and they had thin stratus clouds spreading out from them at a thousand or two thousand feet up in the sky.
The weather report of the naval pilot speaks of cloud stratus at 200 ft and visibility of a quarter of a mile at worst.
At the time, the aircraft was between two layers of stratus cloud less than 3,000 feet apart.
Observations suggest that when marine stratus is present alone, drizzle is minimized.
Onshore winds in spring and early summer bring mists or low stratus clouds (known locally as sea frets) to the area.
The formation of large-scale (stratus-type) clouds is more physically based, they form when the relative humidity reaches some prescribed value.
Like stratus clouds, they form at low levels; but like cumulus clouds, they form via convection.
