Tropical Cyclone Isobel / South Coast Low

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Postby MikeF » Sun Jan 07, 2007 5:35 pm

Thanks TimS

I was 10 cm out in my prediction at about 5 oclock on what the storm surge may be.

I was basing it on the expected tide height and the tide height as it looked on the day.

Amazing that I was so close :)

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Postby SimonB » Sun Jan 07, 2007 9:06 pm

MikeF wrote:I have more pics if you guys are interested...

Mike, post away. Always interested in photo's.

Simon....

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Postby MikeF » Tue Jan 09, 2007 6:02 am

We have been declared a natural disaster area and it looks as though the damage bill may be in the order of 10 or more million dollars. Definitely rates as an expensive weather event.

will post more photos later.

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Postby Tim S » Tue Jan 09, 2007 8:09 am

Looking forward to those photos Chop. :)

The damage has been quite widely covered on ABC radio, this morning they talked to a fisherman that is based at the Bandy Creek Harbour, doesnt sound good for him and others like him at all. Apparently he has spent the last 2 months getting his boat ready for the 6 month (shark?) season that starts around now, only to see his boat stuck on sand for what might be a few months. I dont know what these guys will do considering a lot of them would be getting their only income from fishing and are unable to do this. Hopefully the government will step in and help them out.

Regarding the dam at Bandy Creek, I don't really understand the construction, why would there be a weak point at the ends? Surely they would have floodgates they can open in the case of the river swelling as it did? By the sounds of what I have heard the water flows over the dam when its full and because there was so much it was forced to the ends of the wall where it eroded the massive sand banks on each side.
Kia Kaha, stay strong, live long and above all have fun. :)

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Postby MikeF » Tue Jan 09, 2007 9:32 am

The Gate was rusted shut due to lack of maintenance by the DPI (Deparment of Planning and Infrastructure) I believe.

Either way I think that it was not properly designed in the first place by making the gate too small and not putting in a proper spillway to handle floods.

More Photos of the harbour and gate


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Postby Tim S » Tue Jan 09, 2007 11:24 am

Yeah, those photos definitely tell the sad story Chop, another great set! :)

In the 5th one, it has the dam (looking more like an island now!) with a very large area of nothing on the right side, what used to be here? was it all sand dunes on both sides of the dam?

Very poorly constructed, the designers obviously never took into account a 1 in 50 year rainfall event, although this was probably more a 1 in 100 year event? I still feel that dam would have failed if less rain fell, I mean rusted spillway gate?! thats just asking for trouble. :x
Kia Kaha, stay strong, live long and above all have fun. :)

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Postby silvercloud » Tue Jan 09, 2007 2:41 pm

Wow thats some major damage. How'd the beaches fare?

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Postby MikeF » Wed Jan 10, 2007 6:01 am

most of the beaches went well and will recover quite quickly. But the town beaches suffered a lot of erosion that backed all the way to the cycle path is one point. The sea wall suffered a lot of damage and was destroyed in most places. I have yet to take photos of that area. The council has been busy dumping sand there though it is not very clean sand so there has been a lot of discolouration of the beach and water since then.

Something I have not mentioned so far but Beef_tacos comment in the new year resolution thread reminded me of it. Most farmers around here are stoked with the rain and the amount of it. It has solved their water issues for at least 18 months (assuming that we have a somewhat ordinary winter). Speaking to a few farmers (some of them were carting water last week) , they say the stock losses due to the wind or fencing lost due to flooding are minor in relation to the fact that they now have water for stock. It is just an interesting thought when it appears it is all doom and gloom.

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Postby MikeF » Wed Jan 10, 2007 9:18 am

Another interesting thing

This is a graph of my rainfall rates per hour over the whole event. Sorry for the side wise scrolling for some of you. The interesting point is that there was a period of about 30mm per hour rainfall rates for a while and around 20mm/h other times.

Image
Last edited by MikeF on Tue Jan 16, 2007 7:23 am, edited 1 time in total.

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Postby squid » Thu Jan 11, 2007 6:39 am

sure is alot of work ahead

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Postby Tim S » Thu Jan 11, 2007 10:13 am

Just spotted this from the BoM (only took me a week :))

Heavy rain breaks records in the southeast of WA
(issued 5 January 2007)

The remains of ex-Tropical Cyclone Isobel has combined with a strong mid-latitude trough to cause record breaking rainfall and strong winds in the southeast of Western Australia. Several sites broke their highest daily rainfall records including Esperance where the 153.2 mm recorded at 9 am this morning eclipsed the 106.6 mm recorded on 7 January 1999. The highest rainfall amount occurred at Esperance Airport where more than 221 mm has fallen in the past two days. The rainfall has caused serious flooding in the region.

"While it is common for the remains of a tropical cyclone to cause heavy rain over inland parts of Western Australia it is quite exceptional to have it coincide with such a strong trough to the south", said Neil Bennett, acting Manager of Weather Services in WA.

The strongest recorded wind gust was 111 kilometres per hour (60 knots) at Esperance at 9pm WDT on Thursday (4th). This broke the previous highest January wind gust in Esperance of 104 kilometres per hour in 1975.

The Bureau of Meteorology issued the first Severe Weather Warning for the area at 3pm WDT on Tuesday 2 January giving Emergency Services and the community plenty of notice before the strong winds and rain commenced.

Some significant rainfall totals:
Site
Daily rainfall (mm) 48-hour rainfall (mm) Previous daily rainfall record
(sites more than 10 years of records)
4 January 5 January
Esperance Aero 49.0 172.0* 221.0* 101.4 mm 6/1/1999
Cheadanup 42.8 161.4 204.2
Telina Downs 56.6 138.6 195.2 80.0 mm 27/6/1966
Merivale Farm 47.6 137.8 185.4 109.2 mm 6/1/1999
Esperance 31.0 153.2 184.2 106.6 mm 7/1/1999
Munglinup 25.8 153.6 179.4 62.4 mm 8/1/2006
Erinair 31.4 138.6 170.0 90.2 mm 6/1/1999
Ravensthorpe 28.4 112.8 141.2 102.9 mm 20/1/1939
Balladonia (in Eucla) 134.1 3.6 137.7


heres a link to the media release:
Kia Kaha, stay strong, live long and above all have fun. :)

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Postby Monsoonal-Maiden » Thu Jan 11, 2007 6:09 pm

Amazing photo's!

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Postby MikeF » Fri Jan 12, 2007 3:12 pm

Some more great photos not taken by me and the copyright owner is not known.

I received them in an email.

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Postby radar » Mon Jan 15, 2007 12:15 pm

Wow @ those aerial shots Chop! Looking at how much wider the mouth of the creek is following the event compared to before it I don't think it would matter how the dam and gate were designed the outcome for the harbour would have still been the same.

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Postby SimonB » Mon Jan 15, 2007 5:00 pm

Wow, those photo's were worth waiting for. Amazing. The aerial shots just add more perspective too.

Thanks,

Simon....

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Postby radar » Wed Jan 17, 2007 12:26 pm

Hey guys,

Something interesting I found on the net whilst working my butt off at work today! :wink:

Have a look at the below SSTS charts:

20th December 2006
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5th January 2007
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Check out the cold anomolies that developed along the south coast, presumably in response to all the rain and run-off from this sytem.

Cheers

Radek

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Postby MikeF » Wed Jan 17, 2007 1:51 pm

very interesting Radar. Seems that there has been some major effects off the coast too

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