In order to ensure the normal operation of the 29th Olympic Games in Beijing, how did China's meteorological departments intervene in rainfall?

On August 8, the air humidity in Beijing reached more than 90%, almost saturated. Since noon, a series of strong convective storm clouds have moved from southwest to Beijing and to the "Bird's Nest".

Beijing meteorological support and other departments jointly fought, using aircraft and ground rockets to continue the rain suppression operation, * * * sowing 8 tons of bentonite, launching1110 rocket, and successfully intercepting the rainstorm. The opening ceremony of the Olympic Games lasted more than 4 hours, and it didn't rain in the National Stadium "Bird's Nest".

Guo Hu, director of the Beijing Meteorological Observatory, said that since August, a large cold front cloud system has formed in the upper reaches and northwest of Beijing, which has delivered a steady stream of warm and humid air to Beijing at the edge of the southeast subtropical high. With the approach of the opening ceremony, the weather changes in Beijing are becoming more and more complicated. At 7: 20 a.m. on the 8th, the rainfall cloud system formed in Hetao area was continuously strengthened and moved towards Beijing. The meteorological department keeps a close eye on this cloud system. Guo Hu said: "If you walk faster, slower and stronger, it may have different effects on the opening ceremony."

At 8 o'clock, the 10 aircraft stationed at the airport entered the standby state, and more than 300 operators and air ground support personnel were ready to carry out the "rain suppression" operation at any time. From about 13: 00, in more than three hours, two civil planes carried out airborne cloud physical detection in the south and southeast of Zhangjiakou, and two other military Yunba planes sowed 8 tons of bentonite in the south and southeast of Zhangjiakou, which made some heavy rains in the north of Baoding, Hebei fall ahead of schedule. At that time, the maximum rainfall reached100 mm.

"We used satellites and weather radar to closely track the changes of rain clouds and found that by the afternoon of the 8 th, strong convective clouds appeared around Beijing and developed rapidly, gradually approaching the' Bird's Nest'." Xie Pu, director of the Beijing Meteorological Bureau, told the reporter that at 0/4 on the same day, more than 680 workers on the ground rocket operation sites in Beijing, Hebei and Tianjin had all been assembled.

16: 08, Hebei 13 ground rocket operating points and 25 ground rocket operating points in Beijing began to operate, which curbed the development of the first batch of cloud systems; At 20 o'clock, the constantly "bubbling" rain cloud system began to affect the suburbs of Beijing from the northeast and southwest, and continued to "surround" the urban area. At this time, it has rained 0.9 mm in the Wukesong area closest to the urban area. The pager in the weather modification command room of Beijing Meteorological Bureau keeps ringing the message sent back by the weather modification operation point: "Rocket launch operation is completed." "The rain has stopped." "The rocket launcher is finished."

2 1: 35, the results of meteorological consultation showed that there was a super convective cloud in Baoding, Hebei Province, with a cloud height of nearly 20 kilometers and moving towards Fangshan District, Beijing. At the same time, there are strong local new convective clouds in Shunyi, Miyun and Mentougou, and the rainfall will affect Beijing urban area within 1 hour. The Meteorological Observatory immediately issued a yellow warning for lightning.

At this time, the Working Group on Weather Modification for the Olympic Games and Paralympic Games decided to take the method of beating clouds and cutting off the water vapor transportation in the clouds, and organized and implemented rocket catalytic operations in batches. Call, contact, reply, after another round of super rain suppression operation, according to the real-time analysis of radar detection of weather modification command center, after the rain suppression operation of aircraft and large rockets, the echo center of heavy rainfall is obviously weakened.

By 23: 40, the artificial rain removal operation of the rocket that lasted for more than 7 hours was all over. There were 13 ground rocket points in Hebei and 25 ground rocket points in Beijing, and 20 rounds of artificial rain suppression interception were carried out, with a total of165,438+065,438+000 rockets launched.