To Be Rated a Severe Thunderstorm by the National Weather

question 26

True/False

To be rated a severe thunderstorm by the National Weather Service, the storm has to have at least one of the following: large hail with a diameter of at least three-quarters of an inch, surface wind gusts of 40 knots or greater, or produces a tornado.

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Definitions:

Rock Avalanche

A rapid, massive flow of rock debris down a slope, typically triggered by seismic activity or the undercutting of a mountain's base.

Rock Fall

A rock fall refers to the rapid descent of rock from a steep cliff or mountainside, often triggered by natural processes like weathering or human activities.

Earth Flow

A type of mass wasting event where soil and regolith move slowly downslope, often triggered by saturation from rainfall or melting snow.

Creep

The slow, continuous movement of material, such as soil and other weak materials, down a slope.