One of the radar analysts, atmospheric scientist Paul Kucera, said the West African weather systems are poorly understood.

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Kucera broke Canas early in the match and raced into a 4-0 lead before closing out the first set.

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Canas fought back from a break down in the closely contested second set before Kucera again regained his composure to win.

BBC: Koubek books final spot

Kucera, who had lost to Canas in the semi-finals last year, breezed into the last four after a 6-1 7-5 win.

BBC: Koubek books final spot

Downhill world champion John Kucera and World Cup slalom champion Jean-Baptiste Grange are just two who will miss next year's Winter Olympics through injury.

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James Kucera, head of mobile for NAMCO BANDAI Games America Inc.

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In the last four Federer will face sixth seed Andy Roddick , who beat Karol Kucera, conqueror of second seed Juan Carlos Ferrero, 7-6 6-3.

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Meanwhile, unseeded American Mardy Fish beat Japanese Goichi Motomura 4-6 7-6 (9-7) 6-2 and Karol Kucera of Solvakia downed German Maximilian Abel 4-6 7-6 (7-2) 6-4.

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However, Canada's Kucera lost the chance to compete in his home Olympics when he broke his left leg after crashing in the super-giant slalom at Lake Louise in Alberta last month.

BBC: World Cup ski casualty list concerns federation