Chapter 10, Thunderstorms and Tornadoes

15 terms by JoeWest 

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Thunderstorm

a small storm often accompanied by heavy precipitation and frequent thunder and lightning

Airmass Thunderstorms

common durning summer afternoons or in coastal areas at night.

Cumulous Stage

The stage of a thunderstorm which is characterized by updrafts and large white puffy clouds.

Mature Stage

the second phase of a thunderstorm, where downdrafts move from the base of a cumulonimbus cloud and produce heavy precipitation. Tornadoes touch down during this phase of the storm.

Dissipating Stage

3rd stage of a thunderstorm, updraft weakens as gust front moves away so the precipitation falls until it is finished with no updraft to refuel it

Squall Line

long line of heavy thunderstorms that may occur just ahead of a fast-moving cold front

Severe Thunderstorm

A thunderstorm producing damaging winds or winds greater than 58 mph and/or hail an inch or greater in diameter.

Supercell Thunderstorm

These are the most severe of severe thunderstorms

Outflow Boundary

a line separating an air mass cooled by a thinderstorm and the surrounding air. it behaves like a cold fromnt and is characterized by a shift in wind and drop in temperature. in large thunderstorms, the outflow boundary may persist for more than 24 hours and cause instability that leads to new storms.

Gust Front

the boundary between cold and warm air at the surface during a thunderstorm which forces warm air up into the storm cell

Microburst

small(less than 4 kn across), short-lived, straight line downbursts of wind that occur beneath some thunderstorms

Roll Clouds

1. Occurs in severe and fast moving thunderstorms
2. indicate presence of low level wind shear and extreme turbulence

Mesocyclone

an area on the flank of a supercell storm characterized by rotating clouds, precede tornado formation

Tornado

a localized and violently destructive windstorm occurring over land characterized by a funnel-shaped cloud extending toward the ground

Doppler Effect

change in the apparent frequency of a wave as observer and source move toward or away from each other

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