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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 Debbie on track to be category four by landfall on north Queensland coast

12:12 EDT

Tropical Cyclone Debbie remains on track to be a severe category four cyclone when it makes landfall, with the system forecast to cross the coast on Tuesday morning somewhere between Lucinda, north of Townsville, and an area north of Mackay.

Cyclone Debbie strengthens as Queensland braces

10:54 EDT

Tropical Cyclone Debbie continues to strengthen over the Coral Sea as Queensland residents prepare for destructive weather in the days ahead.

Sultry Sunday for Adelaide

10:07 EDT

Hot and humid conditions will affect Adelaide through today and into the early hours of Monday.