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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Forecast of high winds prompts thunderstorm asthma warning for south-western Victoria

15:07 EDT

Victoria's Chief Health Officer Brett Sutton has issued a thunderstorm asthma warning for the state's south-west weather district as a squally change crosses the state.

Temperatures to soar over the weekend as southern Queensland swelters through heatwave

13:59 EDT

Temperatures are forecast to rise across southern Queensland this weekend, peaking on Sunday, and with no reprieve expected until Wednesday.