AP EXPLAINS: How one computer forecast model botched Ian

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AP EXPLAINS: How one computer forecast model botched Ian
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As Hurricane Ian bore down on Florida, normally reliable computer forecast models couldn’t agree on where the killer storm would land. But government meteorologists are now figuring out what went wrong — and right.

bore down on Florida, normally reliable computer forecast models couldn’t agree on where the killer storm would land. But government meteorologists are now figuring out what went wrong — and right.

“It’s pretty clear that error is very consequential,” said former NOAA chief scientist Ryan Maue, now a private meteorologist who wasn’t part of NOAA's postmortem. People wondered why the worst didn't happen. There are meteorological, computer and communications reasons. “A lot of what we notice in the public is when there are big misses and those big misses affect people in populated areas,” Tang said in an interview.

For years meteorologists touted the European model as better, because it uses more observations, is more complex but also takes longer to run and comes out later than the American one, Tang said. The American model has improved after a big boost of NOAA spending, but so has the European one, he added.

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