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Snowbirds
This term was first coined for people from the northern United States or Canada who spent the winter in the south each year to escape the snow and cold weather of the north. Also now applies to the seasonal migration of retired Australians and Europeans.
Snowflake
A group of ice crystals that
have clumped together so they are sufficiently heavy to fall out of a cloud. Snowflakes may be several centimetres across.
 Snowflake – Snowflakes show the characteristic six-pointed features of crystalline ice.
Squall
A sudden storm with wind speeds of 40km/h or more and lasting
for at least two minutes, typically accompanied by rain, snow, or sleet. A squall line is a patch
of stormy conditions that may accompany a front.
Steam fog
A kind of advection fog that forms when cold air moves over a warm, wet surface such as a warm ocean current. The air warms at the
base by conduction and becomes saturated by the evaporation of moisture from the river, lake, or ocean. Because the bottom of the air becomes warm, it tends to rise by convection and this carries the fog upwards as it forms. This gives the appearance of rising steam or smoke. A common steam fog is arctic sea smoke.
Storm
Severe weather with heavy rain and strong winds. The most severe
storms are tropical cyclones,
also called hurricanes and typhoons. (See also: Lightning; Thunder; Thunderstorm.)
Storm-force wind
A very strong wind (Beaufort scale 10 and 11).
Stratocumulus cloud
Low level white or grey clouds with a rolling, or rippled, appearance. They are not generally rain clouds because they are too thin. Higher-level clouds of the same kind are called altocumulus.
 Stratocumulus cloud – Stratocumulus cloud is seen as flattened cumulus, often in rolls.
Stratosphere
The part of the atmosphere above the region where clouds form. The stratosphere acts as a lid, keeping all the air turbulence and clouds close to the ground, in the layer called the troposphere.
 Stratosphere – In this picture the plane is flying in the stratosphere with the troposphere and its clouds and dust below.
Stratosphere
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