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Let us move back a little bit. Typhoon Wayne in 1986 was an abnormally unusual storm. It changed courses for four times, and made three 180-degree turns! The Royal Observatory of Hong Kong had to hoist tropical cyclone warnings three times for Wayne. A record to break!

Fig. - The plot of Wayne's track, plus the tropical cyclone signals hoisting time indicated. You can see the complicatedness of the track, difficult to forecast. 

Was Wayne the most unpredictable storm you have known? Probably. (In fact, Wayne's track was affected by another typhoon Vera.) But WILL Wayne be the most predictable one? Absolutely not. I'm sure the ones coming in the future, are more unpredictable than we could imagine!

Fig. - Severe Tropical Storm Maria in 2000 also forced the Hong Kong Observatory to hoist TC signal twice. This time Maria was affected by another typhoon Prapiroon. In the right figure, you can see how the two storms moved RELATIVE to each other. This phenomenon is called Fujiwhara effect.

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Note: Satellite images on this webpage are from Kochi University, Japan. Other figures are from the Hong Kong Observatory.