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Weather News - Spring wrap-up

Ben Domensino, 1 December 2016

Spring has drawn to a close across Australia and as usual, it was a mixed bag around the country.

Southern capital cities were relatively cool and wet, while warm and dry conditions dominated in the east. This contrast was driven by a couple of broad-scale climate patterns called SAM and the IOD.

A predominantly negative Southern Annular Mode (SAM) caused westerly winds to be more prevalent than usual across parts of southern and eastern Australia during October and November. Meanwhile, a negative Indian Ocean Dipole (IOD) helped enhance the amount of moisture and cloud being produced across parts of western and southern Australia, particularly early in the season.

The combination of a negative SAM and IOD caused cloud, rain and cooler temperatures to thrive over southern and western Australia, while drier and warmer air was carried towards the eastern seaboard by westerly winds.

It was the coldest spring in 24 years for Adelaide, 21 years for Melbourne, 13 years for Canberra and 11 years for Perth. It was also the wettest spring in 15 years for Adelaide, seven years for Hobart, six years for Canberra and five years for Melbourne.

In the east, Brisbane had its driest spring in 13 years and the warmest in eight years. Sydney experienced its driest spring in four years and the warmest in seven.

While the IOD is no longer influencing weather patterns in Australia, the negative SAM will continue to sway conditions during the beginning of summer. This means that eastern states will opening the season with more hot weather.

Heatwave conditions have been forecast for much of Queensland and northern New South Wales during the first four-to-five days of summer.

The most oppressive conditions will be in southern inland Queensland, where some centres are expected to reach 42-44 degrees from Friday to Monday. Western suburbs of Brisbane and Sydney are both forecast to reach the high thirties on Friday.

- Weatherzone

© Weatherzone 2016

Weather News - Severe storms strike again

Ben Domensino, 1 December 2016

The first day of summer has produced supercell thunderstorms over northeast New South Wales and southeast Queensland.

Storms exploded over the region from 3pm EDT today and quickly intensified while moving towards the north and northeast. In the mix today were two rotating supercell thunderstorms, which are the most intense and dangerous type of storm.

One supercell ploughed through the Northern Rivers district in New South Wales, clipping Casino, Kyogle and Nimbin. The second one further north formed near Esk, before heading up towards Woodford and Maleny.

Warnings for destructive winds, giant hail and heavy rain were issued as the first day of summer put on an epic show for storms chasers in the region.

Initial observations included golf to tennis ball sized hail at Peachester and Kyogle.

While the storms were roaring further south and north, sky gazers in the Gold Coast area were lucky enough to witness rare mammatus clouds. These pouch-like clouds form as cold air sinks through the atmosphere and are known to develop in the vicinity of storms.

Severe storms will continue during coming hours. The latest severe storm warnings are available here: http://www.weatherzone.com.au/warnings.jsp

- Weatherzone

© Weatherzone 2016

Weather News - Eastern storm outbreak continues

Ben Domensino, 30 November 2016

Severe thunderstorms are lashing parts of the Queensland and New South Wales once again this afternoon.

The final week of spring has been a stormy affair for the eastern states, with warnings being issued each day since Friday. The final day of the season is continuing the streak and warnings have been issued in both states.

Both Brisbane and Sydney were included in the warnings today, which stretched from central New South Wales to southeast Queensland during the middle of the afternoon.

All storms in the warning areas today are capable of producing damaging winds, large hail and bursts of heavy rainfall. A few particularly nasty cells are capable of very large hail and destructive winds.

Most of the storms are confined to the ranges, although they could drift towards the coast during the next few hours.

The latest warnings are available here: http://www.weatherzone.com.au/warnings.jsp

- Weatherzone

© Weatherzone 2016