A pesky one for the Warmists
In their usual form, Warmists have been out in force blaming the recent Brisbane flood on global warming (e.g. here), quite ignoring the fact that Brisbane flooding has been happening since Brisbane was founded nearly 200 years ago.
They also allege that the world has warmed significantly in recent decades. That should mean that the recent flood was greater than previous floods. Since the previous flood, however, a conservative government built the huge "Wivenhoe" flood mitigation dam. So flood levels don't necessarily tell us much.
What DOES tell us something is the amount of rainfall. If global warming were the dark person in the woodpile, recent rains should have been a record high. They were not. The recent Brisbane rainfall was dwarfed by the amount of rain that fell during the previous flood 36 years ago
BRISBANE had more rainfall in the 1974 floods than it did in the latest episode, preliminary figures show. And rainfall during the 1893 floods may have dwarfed both the 1974 and 2011 events.
The weather bureau on Tuesday unveiled rainfall comparisons suggesting the city falls were relatively light compared with '74. But the inland falls that caused the flooding of the Brisbane River were extremely heavy. The bureau stressed all data was not yet complete.
But weather experts suggested "peak rainfalls from the 1974 event were substantially heavier than those in 2011". Brisbane's three-days and one-day totals were 600mm and 314mm in 1974, compared with 166mm and 110mm in 2011. "However, in 1974 the heaviest rains were closer to the coast whereas in 2011 heavy rains spread further inland," the bureau said.
Insufficient data exists for a comprehensive assessment of the 1893 floods. But what data the bureau has suggests 1893's rainfall was extreme. Crohamhurst in the Glass House Mountains, inland from the Sunshine Coast, received 907mm on February 3, 1893. That remains an Australian daily record.