Rob Sharpe that is, a Meteorologist working for Sky News Australia.

I say that because almost alone among his breed he made a forecast in October 2022 for lots of rain and flooding in Australia this summer, based on a non-weather event in early 2022.

How a Tongan volcanic eruption almost guarantees a ‘flooded summer’ for Australia’s east coast

Ok, so he does add the usual scientific hedging of “almost”, but it’s the explanation he gives that is as impressive as the forecast itself. You can read the detail at the link but after some discussion about the normal waxing of La Niña he gets to the meat of what the volcanic explosion would do, which basically it goes like this:

  • The eruption put 20% more water vapour into the stratosphere than normal and that stayed in the Southern Hemisphere (SH) in the same way the lower altitude ash did.
  • The water vapour has cooled the SH stratosphere, by reflecting more sunlight back out into space, and reflecting Earth’s radiation back to the ground.
  • That, in turn, has cooled Antarctica.
  • Which has pulled the Polar vortex, including the Southern Annular Mode (SAM – which is one of Australia’s weather drivers) closer to Antarctica – when it would normally have expanded North to provide Westerly winds across Aussie.
  • The lack of those winds will thus allow warm, wet tropical air to push further south across Aussie, dumping vastly more rain than normal, and causing floods.

By the time we get to the end of summer I’m expecting this event to go down in the history books as the “Flooded Summer” – even though it began in spring just like the Black Summer fires. 

And so it has proved to be, and although he didn’t mention it, New Zealand would get the same treatment since it also lies in the path of the normal SMR pattern

An impressive prediction not just for its accuracy but for the fact that the theory behind it was accurate, showing that the forecast was not just a flip-of-the-coin.

Meanwhile, this was NIWA’s prediction:

“Everywhere except Gisborne, Hawke’s Bay and Wairarapa are likely to see less rainfall than normal because of periods of excessive humidity and hot temperatures.”

Mind you, NIWA is focused on Climate models rather than meteorology and as this article points out, they’re pretty much just an outpost of the American NOAA and repeat their forecasts – with a bit of Te Reo thrown in.