Category Archives: Hailstorms

Storms that produce hailstones

Severe storms and hail events – October 2021 – Eastern NSW and QLD

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A feature of October 2021 has been the number of significant thunderstorm events across eastern New South Wales and Queensland which has been unusual. Several of the storms have reached supercell status and most have been well documented by residents partly because they have struck population centres.(If you have experienced hail damage, please contact 0408020468 or go to haidents.com.au)

As such the record of these have not gone unnoticed by residents.

Several of the storms and hail events have caused extensive damage to property such as the Coffs Harbour (Tormina storm) of Wednesday 20 October 2021.

The number of events are growing and now includes:-

1 - Meadow Flat (Between Bathurst and Lithgow), Goulburn, Western Sydney and the Armidale events of Thursday 14 October 2021 (Four separate storm events) previously covered in earlier posts.

I have since learnt that the Goulburn storm of the 14/10/21 produced hail of up to 4 cm in size across the southern part of the town.

2 - Toormina storm (Part of Coffs Harbour City) - The storm of Wednesday 20 October impacted Toormina particularly hard with excessive hail believed to be in the order of 2 to 4 cm in size (Up to golf ball size) which has resulted in hail drifts. Extensive damage is evident at the local shopping centre.

The weather station at the nearby airport recorded a remarkable fall of 69.6 mm of rainfall from the event but what is remarkable is that 24 mm of that fell between 2.18 pm and 2.30 pm which is 2 mm per minute. The airport also recorded peak wind gusts of 87 km/h. Damage is extensive and local media is suggesting damage in the order of tens of millions even as high as one hundred million.

The main feature of this storm was the prolific hail and the resultant hail drifts thereafter.

3 - The previous day on the 19/10/21 in Queensland, the township of Yalboroo north west of Mackay had credible reports of hail up to 16 cm in size which indications are, a new Australian record for size. Images have been seen in social media and other forms of media showing battered cars, buildings and significant hail damage to structures.

The Bureau of Meteorology is also suggesting credible reports of hail of this size.

Location attached using Google Earth Experimental 2021 - Yalboroo is a small town 71 km north west of Mackay as shown with around 170 residents. The town is above the Tropic of Capricorn within an area where hail events would be rare in any given year.

4 - On Friday morning 22/10/21, a significant thunderstorm struck parts of Brisbane with videos emerging of a brief but weak tornado impacting the airport area. This storm too is remarkable for its intense rain at Brisbane Airport with 84 mm of rain falling between 10.30 am and 11.30 am including 68 mm falling between 10.30 am and 11 am. This is just over 2 mm per minute for 30 minutes. The airport recorded 91 mm from the event.

It appears that there were other similar storm events at the following centres:-

  1. Bracewell near Gladstone.
  2. Mackay where a storm generated winds of up to 80 km/h at the airport at 2.49 pm 20/10/2021. However, media reports suggest winds of up to 120 km/h within the city during the event with smaller hail.
  3. Pittsworth south west of Toowoomba where a storm may have produced a tornado and hail of 1 to 3 cm in size impacting the small town.

The hail that fell in Western Sydney on the afternoon of October 14 (Images attached) has been repeated at a number of other centres in such a short period of time which is unusual. A common feature of all these storms have been the prolific hail being produced with a number of events producing hail to 4 cm in size and the number of tornado incidents being documented.

The events have been documented in Weatherzone and it is suggested that cool dry air in the middle levels of the atmosphere was pushed far enough north even into the tropics and at lower levels, there was an abundance of moisture available to allow major storms to develop (Weatherzone - Weather news “Three maps which explains this weeks severe thunderstorms over NSW and QLD” 21/10/2021)

 

It will be interesting to see whether such a high incidence of significant storms continue into November.

 

 

 

 

 

Significant storm events New South Wales – Thursday 14 October 2021

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During Thursday afternoon, numerous thunderstorms developed across Eastern New South Wales with a number of these becoming severe in intensity and their impacts. A few of these were reported in the media.(If you have experienced hail damage, please contact 0408020468 or go to haidents.com.au)

It is acknowledged that there were numerous storms and chasing was not possible due to COVID lockdowns however three such events do stand out for the day as follows.

1 - Armidale Northern Tablelands NSW

The local airport weather station is situated south west of town and a review of this station weather data does not identify the thunderstorm that impacted the town to the north at around 10 pm. The airport weather station only identifies 10 mm of rainfall but nothing significant.

Further north, it appears that the town was impacted by a significant thunderstorm that brought hail and media reports are showing a tornado passing through the north east portion of town at around 10 pm Thursday evening. Newspaper reports within the Armidale Express shows a trail of damage including damage to buildings at the University of New England and extensive damage to homes along a narrow path across the north east portion of town.

2 - Goulburn

A significant thunderstorm passed over much of the town dropping hail especially across the southern half of the town. The local weather station recorded 11.6 mm of rain in just 5 minutes between 1.25 pm and 1.30 pm Thursday afternoon for a total of 24 mm of rain from the single event. The rain fell  in a very short period of time. The local weather station did not experience significant wind but torrential rain and hail was a feature of this event.

Further storm and rain activity later during the day boosted the tally to 35 mm for this weather station.

3 - Western Sydney (Penrith to Parramatta)

This storm is covered in detail in a separate post but late Thursday a very significant thunderstorm that at one stage was even tornado warned passed over Western Sydney producing copious amount of hail in the 4 to 6 cm range. Generally, 4 to 5 cm hail appear to have been most common. The same storm has caused significant roof damage to Westfield Mt Druitt and I have since learnt of further damage in the area where I live being mostly trees being felled by winds and local power outages.

 

Refer to the post “Significant Thunderstorm Impacts Western Sydney with Large Hail - October 14 2021” for further details including images of hail taken and some details of rainfall. The heaviest fall from the whole event across Sydney was 35 mm around Auburn.

I do not have photos of the storms approach but do have photos that I took of later storms at sunset that developed at or just after sunset. Later that night, distant lightning was observed from storms that were out to sea to the east but too far away to be photographed.

This storm and others were part of a dynamic weather system crossing New South Wales during Thursday. Again, while there were many other storm cells and likely hail events, the three mentioned above have been gaining greater attention due to their impact on population centres of the state.

 

 

 

 

 

 

Significant thunderstorm impacts Western Sydney with large hail – October 14 2021

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During my work meeting at around 4 pm, a significant thunderstorm passed over Doonside (Western Sydney) forcing me to abandon my meeting and take immediate action in protecting my computers, even windows and turn our power off. (If you have experienced hail damage, please contact 0408020468 or go to haidents.com.au)

There were two significant close cloud to ground lightning strikes followed by powerful thunderclaps.

The window adjacent to the home office began taking significant hits from large hailstones and I was hearing large hailstones hit the house roof rather hard. One stone made such a noise that it sounded like the window had been damaged. I advised officers that I needed to leave the meeting in a hurry due to what was going on and I was excused to leave.

 

While I was taking immediate action to protect assets, my wife was taking photos of hail at least in the range of 4 to 6 cm in size. Due to my meeting, I was unable to take photos of the cloud but I did see it out the window as it passed over.

There were two hail bursts with the second burst more intense than the first and it is likely that this would have been enough to cause property damage in the area including some hail damage to cars.

I was able to resume my meeting following this although I was excused at the end as I needed to check on what had happened.

The photos taken in this post are mostly taken following the end of the meeting.

A severe thunderstorm had passed over Western Sydney which had a specified warning for large damaging hail. Notwithstanding melting, we were measuring hailstones in the 4 to 6 cm range that had fallen and lying across the ground.

News reports advise that this storm developed around Penrith producing hail to 5 cm which tracked eastwards towards Blacktown with new cells forming then merging with it. It is also suggested that the storm displayed rotation.

There is damage to Westfield Mt Druitt just a few kilometres to our west including the collapse of glass skylights within the shopping centre. SES crews have had to respond to numerous incidents from this event which at the time of writing are still ongoing.

The storm was followed by another storm and a separate hail event (Third such event) that produced smaller hail but still up to approximately 2 cm in size although this was shorter lived.

A further thunderstorm followed later but no hail occurred.

Upon checking the house for damage, I noted other nearby residents in the area checking their homes and cars to see what had happened.

It appears that this storm featured intense rain and hail for our area and there is much leaf litter on the local roads thereafter.

Rainfall totals have topped 33 mm in a very short time at Canterbury with 28 mm falling at Blacktown Dog Pound and 25 mm at Penrith.

At the time of writing the impacts of this are still not known. It is suggested that this could have been a supercell storm given its suggested behaviour however, I was in meetings and unable to verify what was going on prior to the storm hitting Doonside the way it did and hence, I cannot prove this.

I attach radar images of this storm at it was over the Blacktown area including four images of hail that I took, mostly its aftermath.

 

 

 

 

 

 

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