Predictor

Table 1. The predictors and rapid intensification (RI) thresholds used to estimate the probability of RI.
Predictor	Definition	RI Threshold
PER (kt)	Previous 12 h intensity change	8.9
SST (C)	24 h average sea-surface temperature	28.4
POT (kt)	24 h average Maximum Potential Intensity - Initial(T=0) Storm Intensity	92.3
SHR (kt)	24 h average 850 to 200 MB vertical shear	11.1
RHLO (%)	24 h average 850 to 700 MB relative humidity	69.1

Table 1. The predictors and rapid intensification (RI) thresholds used to estimate the probability of RI.