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Murphy's Law

Hurricane Melissa: Do we need new 'category 6' for most extreme storms?

Wednesday, 29 October 2025 22:59

By Thomas Moore, science correspondent

Hurricane Melissa was the second strongest Atlantic storm on record.

But future hurricanes could be even more intense.

So do we need a new top-tier, a 'category 6' for extreme winds?

At the moment, scientists classify storms by the five-level Saffir-Simpson scale. Melissa was right at the top, a category 5.

Latest updates: Aerial footage reveals scale of Jamaica destruction

So was Hurricane Katrina in 2005, which killed almost 1,400 people and caused $125bn (£95bn) in damage.

To make it into the top tier, a hurricane needs a sustained wind speed of 157 miles an hour.

But some scientists say the 50-year-old scale just doesn't cut it anymore as storms get more extreme. And we need a new top tier - a category 6 - for hurricanes with winds faster than 192 miles an hour.

Would Melissa reach the bar? Not quite. It had sustained windspeeds of 185mph.

Read more:
'Nervous' tourists tell of Hurricane Melissa ordeal
Hospital roof in Jamaica flies off almost hitting staff

The strongest Atlantic storm on record, Hurricane Allen in 1980, had winds of 190mph.

So for now, a category 6 storm is just theoretical.

But global warming is making storms more intense, with rising sea temperatures driving the winds faster and faster.

Right now, the Caribbean is 2-3 degrees warmer than normal, so the destruction left behind by Melissa is climate change writ large.

If fossil fuel emissions keep on rising, there will be stronger hurricanes, and yes, ones which could reach that bar for category 6.

Sky News

(c) Sky News 2025: Hurricane Melissa: Do we need new 'category 6' for most extreme storms?

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