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Weather Resources - Glossary

Wondering what “graupel” is? Or how about “virga”? You have come to the right place. This section contains the definitions of several hundred weather related terms.

Please contact us if you have a suggestion for additional terms.

We have also developed a special glossary section with winter weather terms only.

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Jet Max (or Speed Max, Jet Streak) - a point or area of relative maximum wind speeds within a jet stream.

Jet Streak - A local wind speed maximum within a jet stream.

Jet Stream - Strong winds in a narrow band in the atmosphere. Normally a jet stream is shown on weather maps where winds aloft exceed 50 knots and is usually found between 10,000 and 35,000 feet above the ground. Relatively strong winds concentrated in a narrow stream in the atmosphere, normally referring to horizontal, high-altitude winds. The position and orientation of jet streams vary from day to day. General weather patterns (hot/cold, wet/dry) are related closely to the position, strength and orientation of the jet stream (or jet streams). A jet stream at low levels is known as a low-level jet.

Portions of the 9NEWS Weather Glossary were taken from the second edition of the Glossary of Meteorology published by the American Meteorological Society (AMS). © 2009 American Meteorological Society