Turbulence is severe in the squall-line thunderstorms because of violent updrafts and downdrafts. Above the freezing level, icing may occur. Hail is another possibility in the squall-line thunderstorm and can do extensive structural damage to an aircraft. Under the squall line, ceil-ing and visibility may be reduced because of heavy rain showers. Fog is a rare occurrence because of the strong wind and gusts, but it may be found in isolated cases.
Tornadoes frequently occur with squall lines when the warm air mass is extremely unstable.
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