Set aside an hour to listen to the IQ Squared debate on “Humanity is designing its own demise”
Toby Walsh, Professor of Artificial Intelligence UNSW, Signe Dean, science and health journalist, Clive Hamilton, Professor of Public Ethics CSU, and Kristin Alford, Futurist go at it with zest, intelligence and learning.
Unbelievable progress has been made, especially in health and wealth. Among the things I learnt was that we don’t need to fear AI, just the people behind it, and that Elon Musk is actually mad, but will have a colony of 1,000 people on Mars by 2050. Continue reading Saturday salon 18/11→
Unfortunately people were told to stay in their units, until it became apparent that the fire was spreading up the cladding on the outside of the building – then it was too late for many. Continue reading Saturday salon 17/6→
Mercifully Cyclone Marcia made landfall at Shoalwater Bay, a military training area between Yeppoon and Sarina, south of Mackay. The ABC coverage shows how it zigged and zagged after getting up steam in the Coral Sea:
It headed for Mackay and then side-stepped. Perhaps Kolobok Norris was out there on the beach waving his fists! I do hope he and Graham Bell were safe.
It gathered strength to become a category 5, but not nearly as big bad or ugly as Yasi. Nor will it penetrate as far into the inland, where large tracts remain parched.
There was a three metre tidal surge and with significant erosion a tourist cabin fell into the sea on Great Keppel Island:
There will be a lot of personal stories of danger, escape and loss:
Some people, especially surf board riders, seem to be energised by these events. Here at Noosa they line up for their turn:
Here in South-east Queensland we’ve had a substantial rain depression for a couple of days. I gather it is related to Marcia but there is clear air between them as seen from this BOM screenshot late on Friday:
Considerable swells have already battered then Gold Coast:
Here in Brisbane we await the remnants of Marcia. I gather we are in a 12 hour interval which is like being in the eye of the storm. So far at our place we’ve had about 150 mm or six inches in the old money. We are assured that the main issues will be creek flooding and wind, with the possibility of trees bringing down power lines, hence blackouts and/or blocked roads. We are assured that it will be nothing like the floods of 2011. In fact we may get our reservoirs recharged which currently sit at a bit over 80%.
At time of posting (2 am) it looks as though Marcia has significantly fizzled and is mainly sliding through to the west of us. We’ve certainly had enough rain and it might do some good in agricultural areas.
Update: Geoff Henderson has sent me a link to a CNN map shown on Facebook, with Tasmania labelled Queensland. Here it is:
Over the last few days we’ve received a stream of information and images about cyclone* Haiyan which devastated central Philippines, especially the city of Tacloban. Zoe Daniels compiled a graphic report for the 7.30 Report program last night. She mentions that they went to see a coastal village where the devastation was complete.
Donations can be made through the Philippine Red Cross and Oxfam. Please feel free to post links to other charities in comments.
According to this link you can donate to the Red Cross by via credit card by phoning 1800 811 700. The hyperlink given there is broken.
Dr Jeff Masters’ Wunderbloghas a post which reports the damage initially as $14 billion, breaking The Philippines’ record for damages for the third time in 12 months. Initial estimates of the death toll were put in excess of 10,000, but the SMH suggests the toll from Tacloban alone may have exceeded that figure. Some 9 million people have been affected.
The cyclone has been reported as the strongest ever to make landfall. An article in The Guardian quotes Jeff Masters as putting it at number four with the note that NOAA has stated that the maximum sustained winds estimated for typhoons during the 1940s to 1960s were too strong. The other three were in 1958 and 1961. In his linked post above Masters has compiled an unofficial top ten, with Haiyan at the head. Five of the ten were in The Philippines.
There are two aspects where I’d like better information. Firstly, I heard one report that the wind remained at Category 5 intensity for either six or eight hours (can’t remember which). The system was very large. Secondly, I heard of a storm surge of up to eight metres. Apparently this caused more damage than the wind and was responsible for many of the deaths. In many cases only the lowest areas were evacuated. Continue reading Cyclone Haiyan→
As you know I’m always up for a thread of doom, so when I heard talk of asteroid strikes happening more frequently than previously thought I decided to investigate.
The story starts with an asteroid that exploded in the air in the Chelyabinsk region in February 2013. There was a collection of videos at Slate. Car alarms were set off by the shock wave, but I gather most of the damage came from broken glass. Over 1000 people were injured. There are some stills of damage here.
The rock was about 19 metres across (equivalent to a six-story building), with a mass of about 12,000 tons. When it hit the atmosphere at a speed of 20 kilometers per second (many times faster than a rifle bullet) the energy released was equivalent to about 500,000 tonnes of TNT, and the brightness around 30 times that of the sun.
This Slate article has a description of what happened physically. Broadly:
It came in over Russia at a low angle, slamming into our atmosphere, violently compressing the air in front of it. That created a vast amount of heat and pressure, which simultaneously melted and broke up the asteroid into smaller fragments. Within seconds, the huge energy of motion of the rock was suddenly and violently dissipated, creating an explosion equal to about 500,000 tons of TNT detonating.
I think 500,000 tonnes of TNT is about the equivalent of 40 Hiroshima bombs.
As that article says (see also the BBC and the ABC) asteroid strikes are now thought to happen more frequently than previously thought (paywalled research here and here), perhaps as much as ten times more. Chelyabinsk-type events were thought to happen every 150 years on the average. Now the estimate has moved to every 25 to 30 years. And then there’s all the others in the range from say 1 to 50 metres. Previously we relied on visual records, but some, over the sea, for example, have escaped notice.
Adam Bandt recently wrote an opinion piece in The Guardian suggesting a link between the NSW fires and climate change, then suggesting that the Abbott Government’s action, or lack of it, on climate change has real implications for loss of life. This incurred the displeasure of one Andrew Bolt who, inter alia, quotes or rather misquotes Roger Jones.
In the US tornado alley warm moist air flows north from the Gulf of Mexico in the lower atmosphere and becomes unstable. Dry, cold air comes from the west over the Rockies in the upper atmosphere, with a shear effect to create the top of the column. The warm air becomes unstable and lifts. The shear effect of the upper wind spins the rising column. More air is sucked in by the spinning, rising column. That’s simplistic but those are the basic elements as I understand them.
With climate change the lower atmosphere warm air flow and instability are likely to be enhanced, but there could actually be less wind shear. We don’t know what the result of those factors will be over time, but the suggestion is that if anything there have been fewer severe tornadoes over recent decades. Continue reading Oklahoma tornado and climate change→
Earlier on the 10th there had been what we used to call a ‘cloudburst’ on the Toowoomba Range, when 150mm (6 inches in the old money) fell in about half an hour. I posted some Toowoomba flood pics taken by my cousin’s brother-in-law. Yesterday I heard Anna Bligh tell the story of a year ago, how she was addressing the umpteenth press briefing on the Queensland floods. From September 2010 there had been many cities and towns flooded across Queensland, some of them totally evacuated several times. As she fronted the media a minder handed her a sheet with breaking news. She found herself talking about swift water rescues in the main street of Toowoomba. “This can’t be right”, she thought. “It’s impossible.” It wasn’t. This is what was going on in Toowoomba:
We now have a number of specific threads running on aspects of the Queensland floods. This thread is for comments that don’t fit the specific threads or if you want to comment on other current floods lacking a thread, such as those in Victoria, Brazil or Sri Lanka .
Just to give people some idea of what seems to have happened in Toowoomba, the city of Toowoomba is located just on the west side of the Great Dividing Range. As you travel from Brisbane to Toowoomba, the road begins climbing slowly after about Grantham and Helidon, then climbs steeply west of Withcott before cresting the range at a bit under 700 metres. The eastern suburbs on Toowoomba are built on the western slope of the range, whilst the CBD is located in something of a hollow at the bottom of this slope, with gentler slopes to north and south. The “cloudburst” (to used Brian’s word on the older thread) on the range looks to have basically been funnelled into the CBD by the topography.
Further to my previous comment, the range forms a neat half-circle around Toowoomba on the east side, centered on the CBD.