Category Archives: Effects of Storms

Effects of Storms can be anything from the change in temperature to the damage in some cases extreme destruction

Isolated intense storm at Marsden Park (NSW) with flooding 23 January 2021

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Isolated intense storm at Marsden Park (NSW) with flooding 23 January 2021

Following a second day where temperatures soared to above 35C in Western Sydney including 38C at Penrith, an isolated afternoon thunderstorm developed over Penrith in Western Sydney and traversed east. The images of the cloud structure and its approach are taken west of Blacktown including its base.

Isolated intense storm at Marsden Park (NSW) with flooding 23 January 2021
Isolated intense storm at Marsden Park (NSW) with flooding 23 January 2021

I initiated a local storm chase but only had to travel 10 km to the north west to experience the core of the storm. This storm was intense proceeded with gale force winds then torrential rain but with no hail at my location.

Isolated intense storm at Marsden Park (NSW) with flooding 23 January 2021

I pulled off Richmond Road just west of Marsden Park at a suitable location to document the storms core. However, the core of the storm produced so much rain that there was local flooding along Richmond Road which impacted on traffic flows. The images provided are showing floodwaters from this storm and its impact on Richmond Road including floodwaters over the road and motorists having to slow down when driving through the flood waters.

Isolated intense storm at Marsden Park (NSW) with flooding 23 January 2021
Isolated intense storm at Marsden Park (NSW) with flooding 23 January 2021
Isolated intense storm at Marsden Park (NSW) with flooding 23 January 2021

Floodwaters were up to 20 to 30CM in places during the height of the storm.

There were also power outages from nearby lightning strikes and some tree branches were stripped from trees by the winds (downbursts or microbursts).

Isolated intense storm at Marsden Park (NSW) with flooding 23 January 2021
Isolated intense storm at Marsden Park (NSW) with flooding 23 January 2021

The images attached were taken between 5 pm and 6 pm 23/1/2021. This storm went into rapid decay over Marsden Park. The exact amount of rain that fell in the area is not known as no rain gauges exist although Shanes Park further west provides some clues to the intensity of the storm where 17 mm of rain fell.

Isolated intense storm at Marsden Park (NSW) with flooding 23 January 2021

Sydney severe storms December 20 2018

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Sydney severe storms December 20 2018

The images provided in this post were taken around Auburn / Lidcombe and Berala on the afternoon of December 20 2018 during a prolific thunderstorm event that saw a number of significant storms impact areas of Sydney.

Sydney severe storms December 20 2018
Sydney severe storms December 20 2018

A number of these storms were supercells and two of these storms impacted Auburn within a space of 2 hours.

Sydney severe storms December 20 2018

After I had finished work at around 4.30 pm, a thunderstorm passed over Auburn that produced small hail. Following the passage of this storm, a more significant cell was observed to track NE and had the characteristics of a classic supercell. This cell also passed over Auburn although the hail core passed just to the east of my location. My wife and I stood on the Auburn car park roof to watch this event and we could hear the distant roar of hail fall to our east. As it was, sporadic hail fell where we were.

Sydney severe storms December 20 2018

Following its passage, I drove to Lidcombe to a park where my wife and I were able to document hail 2 to 3 cm in size that had fallen within that area.

I was surprised to see another storm cell form to the south and a much more significant storm forming to the west. The storm cell to the west was moving at speed towards us so I decided to drive down to Berala to ensure that it passed over us.

Sydney severe storms December 20 2018

After parking the car, we had plenty of time to watch what it did. The core passed overhead where we were in Woodburn Road. Berala was hit hard which included two separate hail bursts and my wife and I were documenting hail up to 4 cm in size. Occasionally we heard the noise of large hailstones hitting the roofs of buildings which could suggest larger hailstones falling although sporadically. The largest hailstones that my wife and I could verify were around 4 cm in size. It was too dangerous to be walking the streets due to the amount of cloud to ground lightning that was occurring.

Sydney severe storms December 20 2018

As it was, the storm produced local flooding around Auburn and Berala.

Sydney severe storms December 20 2018

The storms that swept Sydney and other locales during this afternoon were the costliest thunderstorm event since April 14 1999. A review of the Insurance Council of Australia webpage has revealed that the damage from this storm event (Several storms included) tallied $1,038,704,566 as at February 14 2019 with significant losses occurring around Casuala, Oran Park, Liverpool, Mona Vale, Berowra and Gosford. Of the 3,600 calls for help, 1,100 were from the Liverpool area. There were 118,886 insurance claims including 26,322 household claims and 78,221 motor vehicle claims.

Sydney severe storms December 20 2018

This storm event easily surpassed the December 9 2007 event partly due to the number of storm cells that occurred and area affected and of course, it impacted Sydney during the late afternoon peak hour period.

Sydney severe storms December 20 2018

Just after the Southern Tablelands cell intensified it should interesting structure

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Just after the Southern Tablelands cell intensified it should interesting structure

Just after the Southern Tablelands cell intensified it showed interesting structure. The timelapse I guess confirms that too. Strong outflow pushes out in the timelapse. At the time of this photograph and just prior though, strong inflow raced in from the northeast!

Was it an outflow boundary from the the supercell now in Nowra? Or was it rapidly rising updraft not sure - https://youtu.be/qTcU5ckJ_fc Timelapse (yes I know it is heavily processed but I had to as the contrast at the time was not the best but the structure was evident)

Just after the Southern Tablelands cell intensified it should interesting structure

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