Category Archives: Lightning

Lightning and storms

Glenorie Supercell with Wall cloud 21st March 2017

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An impressive supercell developed near Colo Heights and moved rather quickly towards Glenorie on Tuesday. Radar echos indicated hook style signature with curved  on reflectivity radar and possibly weak couplet.

After work, it quickly became apparent of an isolated cell that may exhibit interesting structure and demanded at least an attempted chase. The region along the Northern Road is notorious for tree lined roads blocking what could be uninterrupted views. 

Finally past Castle Hill, it became a frantic effort to find whatever view presented itself. One view provided at least a shot of the structure I had been observing for 15 minutes or so. The second position was perfect and so video was taken. Unfortunately this was cut short due to anvil rainfall. The structure was incredible with classic supercell structure and wall cloud persistent for 30 to 40 minutes. 

Further north, the storm showed signs of a shelf cloud and produced some strong winds as it passed over. As it passed east, a flanking line showed some interesting lowerings. Radar structure showed a decrease in organisation and intensity. The warning was removed.

More storms approached from the west which were intercepted although weakening near Quakers Hill. Frequent lightning and heavy rainfall were the main features of this complex.

See : 64km Radar Loop for Sydney (Terrey Hills), 03:00 21/03/2017 to 00:00 22/03/2017 UTC

Giant Hailstones hit Sydney 18th February 2017

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Giant Hailstones hit Sydney 18th December 2017

Giant Hailstones hit Sydney 18th February 2017

Giant Hailstones hit Sydney 18th December 2017

Giant Hailstones hit Sydney 18th December 2017

A ferocious storm known as a supercell hit northwest and northern Sydney with hailstones up to 8cm smashed vehicles and skylights. The storm developed explosively near Bilpin and split with the eastern storm rapidly intensifying and moving east across the northern part of the city.

Large hailstones 4cm in diameter were first report from Londonderry and also Penrith and Richmond reported larger hailstones. The storm intensified and reports came in from Rouse Hill and Box Hill of significant hailstones to the size of 5cm in diameter as the storm rapidly moved east. Hailstones of 7cm was also reported at Glenhaven. the storm persisted and moved towards the Northern suburbs smashing homes and vehicles with more giant hailstones being reported. Serious lightning strikes also disrupted power across the region. This was the most violent hailstorm to hit the Sydney region since December 2007 when part of the region were hit by similar sized hailstones in Blacktown.

A change had entered the region which normally can deter storms from forming due to the cooler air at the surface. But temperatures across western Sydney and ample moisture persisted throughout the afternoon as the sun was allowed to continue baking the region. As the change moved inland, surface convergence along the change near Bilpin was able to break the solid lid on convection and an isolated storm developed. To rapidly exploded as it tapped the energy from warm moist air across the Sydney basin. Being relatively isolated allowed it to intensify to produce giant hailstones supported of course by upper cooling. 

More storms developed across the Illawarra and also the Central Coast with destructive warnings persisting until most of the storms exited the region.
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See : 128km Radar Loop for Sydney (Terrey Hills), 22:00 17/02/2017 to 22:00 18/02/2017 UTC

See : 64km Radar Loop for Sydney (Terrey Hills), 03:00 18/02/2017 to 22:00 18/02/2017 UTC

See : 128km Radar Loop for Wollongong, 22:00 17/02/2017 to 22:00 18/02/2017 UTC