Category Archives: wind

Winds from hurricanes, typhoons, tropical cyclones and land gales

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

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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

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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.

Storms SE South Australia and Southern Victoria 28 – 29 October 2021

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During Thursday and Friday 28 and 29 October 2021, another burst of rain and storms crossed south east South Australia and parts of South West Victoria.

Information of these storms are somewhat limited as not all of these passed over official weather stations. It appears that some of these storms are significant enough to warrant mention and the following noteworthy events have been identified from local weather stations.

1 - Gawler - A storm dropped 11.8 mm of rain between 10 am and 10.09 am which is over 1 mm per minute. The weather station did not record any significant wind during the event.

2 - Nurioopta - A thunderstorm produced a maximum wind gust of 69 km/h between 10.25 am and 10.30.

3 - Mt Crawford - The weather station identifies 10.2 mm of rain falling from a thunderstorm between 10.11 am and 10.30 am with a peak wind gust of 61 km/h.

Online videos have emerged of a hailstorm passing over Uleybury producing hail of at least 2 cm to 4.5 cm in size although it appears to be short lived.

There are other videos showing hail falling across Adelaide suburbs.

There is also video identifying another hailstorm passing over Harrow (North West of Hamilton) in Western Victoria that appears to have produced hail of at least 2 cm in size.

Other storms impacted western and southern Victoria that damaged powerline infrastructure causing significant power loss in many areas including Ballarat, Bendigo, Kyneton, Point Lonsdale and Skipton.

The far south west portion of Victoria received between 50 and 100 of rain from this event with lighter totals elsewhere.

The weather system largely missed northern Victoria and appears to have been confined to the south west and southern areas of the state.

Forecasts were made of storms to impact much of the inland area of south west New South Wales and the Sydney region however this generally never eventuated.

Another weather system 2 - 4 November 2021

Another weather system is forecast for the period Tuesday to Thursday 2 to 4 November 2021 which is expected to impact many of the areas most affected by the recent storm events.

This system is also expected to produce rain and storm activity across much of inland New South Wales but it is not expected to have a significant impact to the coast and North East New South Wales at this stage.

Rainfall models for this event vary widely but accumulative totals are suggested to reach 25 to 50 mm across large areas of the inland and southern areas including much of Victoria in coming days. For many areas, this will be the second major weather event within the space of one week.

The METEYE rainfall plots for Wednesday and Thursday shows that the heaviest and greatest rainfall chances are expected to occur across much of Victoria and later into southern and Central areas of New South Wales.

With this system following so close to the last system, this would have potential to create further havoc in areas still recovering from last weeks storms.

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