With rainfalls predicted in Beijing on the eve of National Day, ensuring a sunny day for the coming parade is becoming a challenge for the capital.

The Beijing Meteorological Bureau has predicted that rainfalls will hit the capital tomorrow, but may stop on Thursday, Oct 1.

Zheng Guoguang, head of the China Meteorological Administration, said yesterday that the weather for the National Day parade is a challenge with the complicated weather situation.

Meanwhile, China Air Force is preparing to manipulate the weather to ensure a sunny day for the coming Oct 1.

In order to keep clouds, rain and fog away from the sky, the air force has prepared 18 converted transport planes and 48 fog-clearing vehicles with more than 260 soldiers to attend to weather-control measures, Xinhua reported.

So far 10 of the 18 planes have arrived at the Shanxi airbase for preparation for rain reduction on National Day, while the rest are at Zhangjiakou waiting for a commander from Beijing Municipal Meteorological Bureau, it reported.

"The Air Force pays high attention to the artificial weather manipulation and we believe that the more equipment applied, the larger the area we can manipulate and the better weather we can have," Cui Lianqing, deputy director of meteorological department in China Air Force told Xinhua.

Transport planes will sprinkle environment-friendly catalysts to eliminate clouds and reduce rainfall, Cui said.

According to statistics from the Air Force for the past four decades, there is a 36 percent chance of low clouds and a less than 20 percent chance of rainfall on Oct 1 in the capital.

The plan said that if low clouds and mild or moderate rains are a possibility on Oct 1, the air force will cooperate with the municipal metrological bureau to spray the catalyst in the sky before daybreak, Xinhua reported.

If there is heavy fog near the training airbase for the National Day air parade, fog-clearing vehicles will blow it off. This is a widely-accepted practice at some foreign airports, the plan said.

Since September, the air force has carried out six weather-control experiments and gained good results with 10 fog-clearing vehicles, Xinhua reported.