Scientists are racing to update the imperfect system we rely on to warn just how deadly a storm will be.
Hurricanes are ranked by wind speed, which leaves out the cause of 90% of deaths during extreme storms. . The storm received the lowest ranking on the official hurricane categorisation, the Saffir-Simpson scale, due to its wind speeds of 75mph . But storms that just clip in at the lower end of the hurricane scale can cause as much damage as a category five. , which drop instruments that measure the pressure, wind direction and speed as they fall towards the sea.
Misra has proposed a new metric to measure the destructive power of hurricanes, to complement the Saffir-Simpson scale. Known as the, or Tike, the metric measures the size of the wind field, along with the intensity and lifespan of the stormInstead of using reconnaissance aircraft, this methodology would rely on satellite estimates of the wind distribution of hurricanes, Misra says.
"I'm in favour of ditching the Saffir-Simpson scale and starting afresh," says Emanuel. "It is not a very good measure of the actual risk. The focus has been on meteorology rather than risk and we need to change gears. "We need to move towards a human-centred, rather than a storm-centred framework for hurricane warnings," says Emanuel.
The simplicity of the Saffir-Simpson scale, however, does make easy for the public to understand. "It's easy to communicate the threat of the tropical cyclone based on these categories and that is probably the primary reason for the reluctance in changing this metric to anything else," says Misra. With more intense hurricanes, with faster wind speeds, would it help to add a category six to the existing Saffir-Simpson scale?that stops at category five. "There's no reason for to be capped anymore," Kossin told the BBC during Hurricane Beryl earlier in 2024. There are hurricanes that have already surpassedBut simply adding a category six to describe stronger storms may do more harm than good, Kossin says.
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