Weather Glossary - J

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Jet max

(Speed Max, Jet Streak) A point or area of relative maximum wind speeds within a jetstream.

Jet streak

A local wind speed maximum within a jetstream.

Jetstream

Relatively strong winds concentrated in a narrow stream in the atmosphere, normally referring to horizontal, high-altitude winds. The position and orientation of jetstreams vary from day to day. General weather patterns (hot/cold, wet/dry) are related closely to the position, strength and orientation of the jetstream (or jetstreams). A jetstream at low levels is known as a low level jet.

JTWC

Joint Typhoon Warning Center. The JTWC issues warnings and forecasts for tropical systems across the Pacific and Indian Oceans.

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Cyclone Trevor strengthens to category three as it nears Far North Queensland coast

08:22 EDT

Severe Tropical Cyclone Trevor is now a category three system and could intensify further before it makes landfall tonight, the Bureau of Meteorology has said.

Sydney news: Shooters party hit back at 'racist dog whistling', police recordings discovered in Keli Lane case

08:14 EDT

This briefing is compiled by the ABC's digital journalists in Sydney.

Tropical Cyclone Trevor forms off Far North Queensland coast as storms hit the south east

01:03 EDT

Tropical Cyclone Trevor is expected to intensify to a category three system before it crosses Queensland's Cape York Peninsula on Tuesday night.