Significant rain falls – NSW, NT, QLD and VIC – 10 to 12 November 2021

Published by:

Another major rain event has impacted large areas of Australia during the period 10 to 12 November 2021. Rainfall accumulations have been significant in several areas and the area impacted is significant.

The most recent event appears to have been even more widespread and flooding has occurred in some areas. The rain episode commenced on the 3 and 4 November and has continued since with only intermittent spells of clear weather in between.

Northern Territory

During the most recent rain episode, heavy rainfall impacted the Alice Springs area with Alice Springs Airport receiving 100 mm for the 24 hours till 9 am 11 November 2021. In particular, the Alice Springs area of Southern Northern Territory experienced between 66 and 100 mm of rain which was enough to allow water to flow within the Todd River.

New South Wales

For the 24 hours to 9 am 11 November, the following totals were recorded within New South Wales:-

Delungra - 94 mm

Narribri - 76 mm.

Wallangara - 65 mm

The Central West town of Molong received 59 mm being amongst the highest falls for the day.

During the same period, 9 to 36 mm fell across Sydney with the heaviest fall being 36 mm at Belrose on Sydney’s North Shore.

It is noted that while such rainfall was occurring across the east and north of the state, the far south west of New South Wales remained untouched.

Weekly Rainfall - Australia

For the week ending on the 11/11/2021, a vast area of Australia had received at least 25 to 50 mm with large areas of eastern New South Wales having received at least 50 to 100 mm from the event being accumulative totals. In addition to what has occurred across eastern New South Wales and Queensland, the area around and just to the west of Alice Springs had received upwards of 150 mm.

Extensive cloud cover including the presence of thunderstorm cells have helped to boost daily totals. The Himawari satellite pictures of Wednesday afternoon shows extensive cloud cover and thunderstorm cells especially around the Alice Springs area that has contributed to such high rainfall totals.

Friday rainfall totals

Thursday evening and Friday morning,heavier rainfall again featured across much of New South Wales with the highest totals for the 24 hours to 9 am 12/11/2021 being:-

Bunnan (Milparen) - 99 mm.

Mount Palmer - 95 mm.

Rock Forest (North of Bathurst) - 92 mm.

Orange STP - 74 mm.

Bowmans Creek - 73 mm.

Falls over 50 mm were common across the Hunter Valley and the city of Newcastle received between 60 and 88 mm. Falls of 50 mm or greater also featured around Bathurst and Orange in the Central Tablelands of New South Wales.

Widespread falls finally reached south west New South Wales and into North East Victoria where falls of 15 to 33 mm were common including 33 mm at Mt Buffalo and 29 mm in West Wodonga.

 

 

 

 

 

 

Widespread and heavy rainfall impacted large areas of eastern Queensland where many areas received between 100 and 150 mm including Red Hill Alert 152 mm and Blackdown 132 mm.

Even in Sydney, falls of 10 to 32 mm were common with higher totals in the west and south west. With totals accumulating, this made for a wet start to the day as shown in the attached photos. Scenes such as this have been common over the past several days interspersed with brief sunny spells. Some of the rain squalls passing overhead have had weak embedded thunderstorms within them as occasionally peels of thunder have been audible.

 

The rain has now eased across Sydney although during the afternoon a brief heavy shower passed over Blacktown which included a single minor thunderclap being audible.

Enough rain has fallen over several days to cause flooding along a number of inland rivers. At the time of writing, the following rivers were in flood:-

1 - Macquarie River at Bathurst (Moderate flooding).

2 - Belubula River at Canowindra (Moderate flooding).

3 - Cotton Weir on the Lachlan River near Forbes (Minor flooding).

4 - Booligal Weir (Minor flooding).

5 - Minor flooding of various tributaries of the Gwydir River around Moree and Wee Waa in northern New South Wales.

In Queensland, minor to moderate flooding is occurring across swathes of inland areas with the worst at Garrabarra, Dykehead Alert and Glenmore (Moderate flooding) with minor flooding elsewhere. There is also isolated moderate flooding at Diamantina Lakes in the far west of the state.

In north east Victoria, there are no rivers in flood but rain continues to fall which may change this in coming days.

It appears that further rainfall will occur over the weekend across the south but this will ease as the weekend progresses.

Sixty Minutes Interview Jimmy Deguara and Dave Croan way back in 2004

Published by:

Sixty Minutes Interview Jimmy Deguara and Dave Croan way back in 2004

As part of our yearly pilgrimage, Liz Hayes and the professional Sixty Minutes crew chased along side us on a few days in Tornado Alley during the May 2004 season! It was certainly a pleasure to be able to chase and in an excellent season with 20 tornadoes showing Sixty Minutes what chasing was all about! Even whilst we were doing an interview, a storm approached Oklahoma City which became tornado warned. But the true test was trying to navigate the same crew into a mega-supercell - a literal giant that controlled the whole of Oklahoma with multiple tornadoes and a huge mesocyclone approaching you guessed it Oklahoma City. We intercepted this supercell with tornadoes near Geary but unfortunately was not able to get the Sixty Minutes crew down through the supercell due to bad reception, difficult road network and putting them through danger. They were only entering the northern part of the core and had experienced near base ball sized hailstones - this storm produced grapefruit sized hailstones. Nevertheless, it was an awesome privilege to be able to work with such an excellent crew with Liz Hayes! This video re-surfaced recently amongst the archives!

Rain and Storms – Southern Australia – 6 to 8 November 2021

Published by:

This is a continuation of the same weather event capturing the storm activity for the weekend 6 to 8 November 2021.

Friday evening, the remote township of Nullabor in Western South Australia experienced an exceptionally rare thunderstorm being an event that is more likely to occur across the eastern parts of the country.

A thunderstorm produced wind gusts to 98 km/h between 7.10 pm and 7.18 pm and 31.4 mm of rain. When reviewing the weather station, 9.8 mm of rain had fallen to 7.18 pm but 2 minutes later 13.6 mm of rain had fallen. That is 3.8 mm in 2 minutes and by 7.30 pm, 26.4 mm had fallen. For that 10 minute period, 12.8 mm fell or more than 1 mm per minute. This is a semi arid to arid region making this event highly unusual for such a location.

At Renmark Airport in eastern South Australia, a thunderstorm produced damaging wind gusts to 104 km/h at 4.03 pm and again at 4.06 pm. The storm produced 14.6 mm of rain including 4.4 mm in 2 minutes between 4.01 pm and 4.03 pm.

Another thunderstorm impacted Port Augusta in South Australia producing 23.8 mm of rain.

An intense thunderstorm struck the Albury / Wodonga region late Saturday with significant lightning activity producing 11 mm of rain at Albury Airport including 7.8 mm in 6 minutes between 5.36 pm and 5.43 pm. Other weather stations in this area recorded 17 mm to 20 mm from that storm.

It is also known that a hail event occurred at Nagambie in Victoria where it is suggested that hail reached 3 to 4 cm in size.

During early Sunday afternoon, a non severe thunderstorm passed over Western Sydney producing a period of moderate rainfall but no wind or hail. While there was much thunder including one close cloud to ground lightning strike, it was difficult to get any meaningful photograph of it because the storm lacked any significant or worthwhile structure.

Another thundery shower passed over Western Sydney during the evening but the amount of thunder soon decreased. This was more of a rain event rather than a thunderstorm event.

Overnight rain and storm activity across eastern New South Wales produced some very significant totals including 131 mm of rain at Ruvigne and 99 mm at nearby Gunnedah on the north west slopes and plains. Other strong totals for the 24 hours to 9 am 8/11/2021 include:-

Dur - 83 mm.

Bendemeer - 74 mm.

Tamworth - 69 mm.

All within the north west slopes and plains of New South Wales.

Around Sydney, Penrith scored 42 mm while Kurrajong scored 52 mm.

Cumulative rainfall totals are now becoming significant in certain areas especially for the western Northern Tablelands regions, north west New South Wales and to areas south and west of Sydney where 50 to 100 mm has fallen since the event started. Many of the storms that have occurred have been hit and miss and thus some areas are still missing out as shown.

Another rain event is expected during Wednesday to Friday which is expected to boost rainfall totals further although given that some areas are already wet or saturated, the likelihood of inland riverine flooding has increased significantly.

Addendum

As an addendum to this, late Monday, a strong thunderstorm has passed over Penrith producing wind gusts to 95 km/h at the Penrith Lakes Weather Station between 3.24 pm and 3.30 pm and 23 mm of rain at Richmond RAAF. This storm moved north east and did not affect any other part of Sydney. I was unable to chase due to work commitments, but thunder was audible from the cell at Doonside.

The Bureau of Meteorology did issue a specified severe thunderstorm warning for the storm for damaging wind, potential large hail and heavy rain.

s2Member®