Hurricane Glossary - KLTV.com - Tyler, Longview, Jacksonville |ETX News

Hurricane Glossary

An elongated area of low barometric pressure.

Typhoon:

A hurricane in the north Pacific west of the International Date Line.

Unstable:

A turbulent, convective state in the atmosphere resulting from a rapid decrease in air temperature with height above the ground.

Updraft:

A small scale current of air with vertical motion. If there is enough moisture, then it may condense, forming a cumulus cloud and possibly thunderstorms. The opposite of a downdraft.

Vertical Wind Shear:

The magnitude of wind change with height. Vertical wind shear can weaken or destroy the cyclone by interfering with the organization of deep convection around the cyclone centre.

Vorticity:

A measure of local rotation in a fluid flow; the spin of a fluid.

Westerlies:

Surface winds blowing from a generally westerly direction in the midlatitude zone, but varying greatly in direction and intensity.

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