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2020 Atlantic Hurricane season: takeaways from a record-breaking few months

The official 2020 Atlantic Hurricane season ended on November 30th, and in response FM Global has provided seven takeaways from a season which broke records across the board:

1. Many records were broken. There were more named tropical cyclones this year than since record-keeping began in 1851, and many struck earlier in the season than usual and continued later in the season than usual.

2. The season was backloaded. Iota was the latest-forming Category 5 hurricane on record, and November 2020 is in a five-way tie for the most named storms in the month of November.

3. A warming climate meant hurricanes were likely to be more intense and carry more water. Also, sea levels are rising, and the rate of sea level rise is accelerating. All things being equal, these factors made flooding and storm surge more severe.

4. ‘Rapid intensification’ was a growing worry. That’s when tropical cyclones’ maximum sustained winds gain roughly 35 mph or more within 24 hours, as at least nine storms did this year.

5. More property was at risk. For example, Florida, with 3 of the 10 coastal US counties most frequently hit by hurricanes (1960-2008), saw a 270 percent population increase from 1960 to 2010, exemplifying the national and global trends of urbanizing near coastal areas.

6. Complacency is a concern. The weekly drumbeat of tropical storms threatened to numb observers to the risk. Tropical storms (cyclones with sustained winds 39 mph to 73 mph) still did damage even though they didn’t reach hurricane status. Moreover, wind-based categories don’t speak to the growing risk of flood caused by these storms.

7. Mother Nature doesn’t obey man-made rules. The official season has ended, but named storms can happen in December. Should we consider extending the official ‘season’? Hurricane categories only go as high as 5, yet some recent storms have been so intense there’s been discussion of increasing the scale to a 6.

fmglobal.com



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