Two speeds after landfall
A peer-reviewed count of 885 tropical cyclones from 1979 to 2024 finds that storms at or above 29 metres per second weakened 18.6 per cent faster after landfall, while weaker storms lasted 14.5 per cent longer inland.[1]
Weaker storms tie to sea-surface warmth, extra atmospheric moisture and a longer oceanic influence along the track. Stronger storms tie to faster translation, greater atmospheric stability and drier soil. Numerical experiments in the same paper separate those sensitivities.[1]
Separate accounts for coast and inland
One decay curve for every landfalling storm hides two exposures: a faster coastal dump from the strong storms and a longer inland tail from the weak ones. A shift in which storms entered the count from 1979 to 2024 is an alternative account of the same split if the physics stayed fixed.[1]
Coastal districts carry the strong storms' faster collapse. Inland districts carry the weak storms' extra time. A hazard account that keeps those two classes in one bucket mis-states who needs the longer watch. The lever is splitting the curve at 29 metres per second.[1]