Weather Glossary - Q
QFE is calculated by adjusting the station level pressure for the difference between the barometer level and the aerodrome reference level, assuming International Standard Atmosphere(ISA) conditions. An Altimeter set to QFE will read zero when the aircraft is on the runway.
The pressure setting used by aircraft altimeters to give an indication above MSL. The QNH pressure calculation assumes a standard ICAO atmosphere.
A front that shows little or no horizontal movement. By convention, the term applies to a front this is moving at 5 knots or less. The slow horizontal motion combined with considerable vertical motion of the warm air, often gives rise to persistent and sometimes severe amounts of precipitation leading to local flooding.
Power is gradually being turned back on across parts of South Australia but much of the state remains in darkness after a widespread blackout.
South Australia and its 1.677 million residents were left without power on Wednesday evening following severe storms.
Federal Energy Minister Josh Frydenberg says serious questions will be raised about how the entirety of South Australia could be left without electricity in the wake of a huge storm, dubbed the largest in 50 years.