Normalized composite precipitation (mm) pattern for 74 MCCs. Dashed and dotted lines are approximate centroid tracks of -32 and -54oC cloud-shields, respectively. The horizontal axis is the axis of propagation and indicates the storm heading
Cluster around propagation axis the probability of 1 mm of rain is 100% but
for 75 mm drops to 10% nearly coincident with the 35 mm shown in figure above.