Martin Whitmarsh feels a 'fearsome' Lewis Hamilton will have the edge in this season's Formula One world title battle if the rain continues to fall.
The Formula One circus now heads to the Far East for three races, starting with next weekend's first night grand prix in Singapore, before an enthralling campaign concludes in Brazil.
Singapore's tropical climate lends itself to short heavy showers and thunderstorms in the early to late evening, when the race will be starting to accommodate the European audiences.
Fuji in Japan is prone to monsoon-like conditions, as witnessed a year ago, whilst Shanghai in China can also be hit by rain.
McLaren star Hamilton has proven himself a master in the wet over the past 12 months, winning in Japan, Monaco and Silverstone, and he should have won Sunday's race in Italy.
But two wrong calls on the weather by his team, in qualifying and then the race in which he dominated the first half after starting from 15th on the grid, led to him finishing seventh.
Although the 23-year-old only has a one-point advantage over Ferrari's Felipe Massa in the title race, McLaren F1 CEO Whitmarsh feels more wet weather could play into Hamilton's hands.
"We've been very encouraged by the performance of the car in the wet this year," said Whitmarsh.
"Last year we felt the performance differential to our chief rivals was decidedly more marked - there were some circuits where we were clearly ahead, and others where we lacked race-winning pace.
"Given this year has shown Ferrari and ourselves to be remarkably evenly matched, the car's performance in unusual weather conditions could prove decisive.
"Looking ahead, while Singapore is something of an unknown quantity, I think we've all experienced wet races in Japan, China and Brazil, so we feel well prepared.
"And allied to Lewis' fearsome abilities in the rain, we have every reason to feel confident we'll be ready to capitalise on any untoward conditions."
Whitmarsh also believes the team, who can run error-free throughout any given weekend, will emerge on top come the end.
"With the cars extremely closely-matched, I think it will be hard for either team to establish a decisive advantage in the four final races," added Whitmarsh.
"More importantly, I think this world championship will boil down to whichever team and driver makes the fewest mistakes from now on.
"It's about preparing the cars with immaculate reliability, running them responsibly and not taking any unnecessary risks.
"It's all about finding strength in every single area and not exposing any weaknesses.
"It will be a tough battle, but we are gearing up for the fight."