Daily Archives: September 3, 2016

Two rain events – Eastern Australia 30 August to 3 September 2016

Published by:






During the past 5 days, two rain events occurred across southern and eastern Australia. The two events spread across different regions although there was some overlap across North Eastern Victoria where some minor to moderate flooding of the Kiewa River has occurred.

The first event was caused by a cold front passing through while the second event was the result of an inland low pressure cell moving south east across New South Wales and over Eastern Victoria.

Both events caused significant rainfall across certain regions as follows:

Rain event One

During August 30, an extensive rain band crossed through Victoria and southern New South Wales. The event had its greatest impact within the hills and rugged region of North East Victoria. There were also rain shadows in the lee of the ranges and rainfall contrasted sharply.

For example, 104 mm fell at the Mt Buffalo Chalet but 65 mm fell at Harris Lane at the foot of Mt Buffalo. Rocky Valley Falls Creek had 96 mm but 20 km away, less than 24 mm fell. Thredbo had 79 mm but much less fell further east.

Other large totals included Matong North 65 mm, Edi Upper 63 mm, Handcock 61 mm and Osborne's Flat 59 mm. The areas are generally the upper catchments of rivers. Further north and east, falls of 20 to 30 mm were common.

Rain event Two

This event produced a widespread rain event across much of New South Wales and eastern Victoria including Gippsland. There was some overlap across North East Victoria. As a result, the Kiewa River at Bandiana (Wodonga) is in moderate flood and there is minor flooding along other parts of the Kiewa River.

There is also moderate flooding of the Belubula River at 5.32 metres (Central West New South Wales). An extensive area of New South Wales received 25 to 50 mm and falls were consistent. Heaviest totals include:

Canberra's northern suburbs - 50 to 67 mm.
Nimmitabel - 60 mm.
Pomeroy - 60 mm.
Bowning - 59 mm.
Parkers Gap - 53 mm.

North east Victoria

Lake Dartmouth - 57 mm.
Gibbo Peak - 54 mm.

Gippsland Victoria

Bullumwaal 71 mm.
Basin Creek 67 mm.
Mt Elizabeth 66 mm.
Gabo Island 63 mm.

Nothing fell across western and central areas of that state.

Where the overlap occurred from the two events, North East Victoria has had a very wet week where a large region has had more than 50 mm and smaller areas having in excess of 100 mm. This is what has contributed to some local flooding issues along the smaller rivers.

Both events have passed over agricultural lands and would be beneficial to such areas.


Bureau of Meteorology (Rainfall plots) Various.
NASA Worldview (Image of Australia with extensive cloud) acquired 2 September 2016.

USA Hurricanes 29 August to 3 September 2016

Published by:









During the past 7 days, no less than 3 hurricanes have impacted areas within the United States or waters under the jurisdiction of the United States.

There were two significant storms that threatened Hawaii and at one stage, both systems approached the Hawaii Islands only to veer north and south to avoid a direct impact across the islands.

Another hurricane made landfall across the Florida panhandle becoming the first hurricane to make landfall in 11 years since Hurricane Wilma. That was a short lived storm and it only reached Category 1 on the Saffir Simpson Scale. Its greatest impact was heavy rain and flooding that it brought.

The names storms were:-

Hurricane Madelline

On August 29, a very small hurricane had reached Category 4 on the Saffir Simpson Scale as it approached the largest of the Hawaiian Islands. The storm then veered more west south west but lost its intensity just to the south of the big island. As such, the big island was spared a direct hit although the rain bands did impact the island.

Hurricane Lester

Following on the trail of Hurricane Madelline, another small but powerful storm also reached Category 4 on the Saffir Simpson Scale. The named storm Lester also approached the Hawaii Islands but veered more north west. The storm is expected to pass just to the north of the islands. The storm is now weakening as it makes its closest approach to the islands.

Sea surface temperatures around Hawaii are between 27C and 28C, just enough to sustain such storms but it is rare to have two named storms at the same time threatening the islands.

Hurricane Hermine

This is the storm that is providing media attention across the United States as this is the first storm to cross the Florida coastline in 11 years. The storm formed just off the coast of Florida so its lifespan was short. There was not enough time for the storm to develop further due to its location so close to the coastline.

The storm barely reached Category 1 on the Saffir Simpson Scale sustaining winds at peak intensity 68 knots (Approximately 125 km/h). The biggest impact was the rain it produced. The storm has caused flooding in affected areas.

As shown on the National Weather Service Rainfall map of south east United States, up to 6 to 8 inches (150 to 200 mm) of rain has fallen in areas across south west Florida. While there are small pockets where 8 to 10 inches (200 to 250 mm) fell, the storm mostly produced rainfall of between 75 mm and 150 mm. The storm is now tracking north east through the Carolinas as a much weakened system.


1 - CIMSS For forecast plots (Various).
2 - NASA “Worldview” with overlays of Hurricanes Madelline and Lester acquired 30/8/2016.
3 - National Weather Service (Rainfall data for Florida) acquired 2/9/2016.