(First published in The Dominion Post, April 21.)
An expat friend emailed me from Brisbane last week. He had
read about Cyclone Cook hitting New Zealand and wondered whether, after all the
scary warnings, it had turned out to be a bit of an anti-climax.
I had to confirm that his impression was correct. Sure,
trees were brought down, some houses were evacuated, farms were flooded and
there were road closures, power outages and a few landslides.
The impact on those affected shouldn’t be understated. But
there was nothing like the mayhem that breathless weather forecasters (and I mean almost literally breathless, in some instances) had warned
us to brace ourselves for.
MetService should be conducting a rigorous self-appraisal
this week, because it greatly overplayed its hand. In doing so, it put its
credibility at risk. Some of the official predictions came perilously close to
scaremongering.
We were told there was a real risk the intensity of the
storm would match that of April 1968, when the Wahine foundered at the entrance
to Wellington Harbour with the loss of 51 lives. But the conditions then were
dissimilar in one vital respect.
It’s true that in 1968 a tropical cyclone, Giselle, passed down
the country, just as happened with Cyclone Cook. The crucial difference was
that it collided head-on over Cook Strait with a powerful front heading in the
other direction.
It wasn’t Giselle on its own that caused catastrophe, but
the violent clash of two opposing weather systems. Meteorologists must know this, so why create
the misleading impression that Cyclone Cook on its own was capable of
replicating Wahine conditions? It was wrong and it was irresponsible.
This isn’t to say MetService was wrong to issue warnings.
Clearly it would have been negligent not to advise the public to be prepared
for an extreme weather event. There would have been hell to pay if Cyclone Cook
had arrived without prior notice.
What’s at issue is the sensationalist tone of the warnings.
One over-excited forecaster pronounced that it would be a “national event” – no
ifs, buts or maybes – and said not many people would be spared.
In fact the impact turned out to be largely localised, and
not necessarily in the places predicted. Some of the predicted consequences,
such as damaging storm surges and coastal inundation, appear not to have
eventuated – or if they did, had little impact.
The Auckland Harbour Bridge stayed open and the Cook Strait
ferries continued running, contradicting expert predictions.
What’s also troubling is that the meteorologists showed no
inclination to moderate their forecasts even when it became apparent that they
might have over-egged the pudding. They seemed to be enjoying their moment in the spotlight.
When Cyclone Cook deviated from its expected path, one
forecaster pronounced that Auckland had “very luckily” been spared, but that
the worst was still to come. Well, we’re still waiting.
The Central Plateau and the Wairarapa were supposed to cop
it, but neither region did. I live in the Wairarapa and all that happened was
that we got a night of moderately heavy rain from an unusual direction.
Once the cyclone had passed over the country and drifted off
to wherever it is that ex-cyclones go, MetService went into damage control
mode. By that time it was getting some stick on social media; one joker posted
a photo on Facebook showing a plastic chair overturned by the wind on someone’s
back lawn as an example of the devastation wreaked.
A MetService spokesman, defending the forecasters, explained that tropical cyclones were
“fickle beasts which are hard to pin down”.Fair enough; we can all accept that forecasting is an
inexact science. But if cyclones are unpredictable, why so much certainty
before the event?
In fact I wonder if the whole business of meteorology and
forecasting is becoming a bit overheated, if you’ll excuse the pun. Fears of
global warming (real or otherwise), 24-hour weather channels, celebrity weather
presenters and constant warnings of extreme climatic events (hardly a week passes without one) all feed into this
phenomenon. But violent weather events have always been with us.
What should concern MetService is that its credibility took
a hit last week, not so much because of the accuracy of its forecasts but due
to the hyped-up, anxiety-inducing tone of its warnings.
It added to a deepening public scepticism toward “experts”. People
take note when weather forecasters give them a bum steer, just as they take
note when supposedly state-of-the-art, earthquake-proof buildings – designed by
experts – have to be abandoned after a moderate shake while decades-old
structures are undamaged.
People notice, too, that there’s a striking absence of
accountability for the harm done when experts get things wrong. But that’s a
subject for another day.