Doesn't a 50% chance of a less-than-average year mean that there's also a 50% chance of higher-than-average, that is: we know nothing?
I would take it that "less" to mean from a 100% chance of no storms to 100% change of regular activity. Where as "more" would imply 100% chance of worse than average storms. So a regular storm season would center on 0 with it going 100% less -> regular (no change in chance or 0%) -> 100% worse...
At least that's how I took it.
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