Chapter 9 Storms and Forecasting

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an abrupt discharge of electricity through the air

Lightning

thunderstorm stage marked by the arrival of precipitation

Mature stage

forms the bright brilliant flash of a lightning bolt

Return stroke

a long line of advancing thunderstorms, moving ahead of a cold fromt

Squall line

An electron stream that flows from a cloud during a thunderstorm

Stepped leader

a fierce, single-updraft thunderstom

Supercell

a shock wave produced as lightning heats the air

Thunder

a localized storm involving lightning, thunder,strong winds, heavy rain, and sometimes hail or tornadoes

Thunderstorm

a narrow funnel whirling wind produced by a thunderstorm

Tornado

a tornado that forms over water

Waterspout

Rapidly swirling cloud that is the most distinctive visual feature of a tornado

Condensation funnel

thunderstorm stage marked by a billowing, rapidly growing cumulus cloud

Cumulus stage

a rotating column of air that starts on the ground and is not associated with a cloud

Dust devil

a scale based on the Fajita scale, used to classify tornadoes

Ef-scale

A single updraft system in a thunderstorm

cell

concentrated downward blast of wind

downburst

a large rotating updraft in a super cell thuderstorm

mesocyclone

air that is warm near the ground but very cold at higher altitudes

unstable


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