Core Viewpoint - China's meteorological sounding system has achieved a comprehensive upgrade from L-band sounding to the Beidou sounding system, marking a significant advancement in high-altitude meteorological observation and positioning China among the international leaders in this field [1][2]. Group 1: Beidou Sounding System Overview - The Beidou sounding system boasts an overall observation data accuracy exceeding 99% and has been applied in weather forecasting and climate monitoring [1]. - The system utilizes balloons equipped with sounding instruments to collect atmospheric data up to 30,000 meters, including temperature, humidity, pressure, wind speed, and direction [1][5]. - The Beidou sounding system has broken the monopoly of GPS in the meteorological sounding field, showcasing China's independent research and development capabilities [1][7]. Group 2: Technological Advancements - The new Beidou sounding system allows for the collection of atmospheric data during the ascent, floating, and descent phases of the balloon, revolutionizing the traditional high-altitude observation methods [5]. - The measurement accuracy has significantly improved, with wind speed measurement errors reduced from 1 meter per second to 0.3 meters per second, and balloon height errors decreased from 100 meters to 16 meters [8]. - Data transmission has shifted from a "minute-level" to a "second-level" speed, achieving a 100% data completeness rate [8]. Group 3: Global Contribution and Impact - China has established a network of 131 Beidou sounding stations, accounting for 12% of the global total, with 88 stations serving as global data exchange points, contributing approximately 11% of shared data worldwide [8]. - The advancements in the Beidou sounding system not only support disaster prevention and reduction in China but also contribute to the global meteorological observation system upgrade, providing a "Chinese solution" for global climate change response [8].

Core Points - Typhoon "Haikashan" made landfall in Yangjiang, Guangdong, on September 24, becoming the strongest typhoon of the year, following Typhoon "Mina" just five days prior [1] - Guangdong's government implemented a comprehensive emergency response, transitioning to a "combat-ready" state to effectively manage the typhoon's impact [1][4] Group 1: Emergency Response - The meteorological department issued an early warning for Typhoon "Haikashan" on September 18, indicating its potential strength and trajectory towards Guangdong [2] - The provincial emergency response was escalated from Level IV to Level II on September 22, and then to Level I on September 23, marking the first Level I response of the typhoon season [4] - Over 222,000 people were evacuated across the province as part of the emergency measures [5] Group 2: Technological Advancements - Advanced monitoring systems, including satellite, radar, and automatic weather stations, were utilized to track the typhoon's path and intensity [7] - Real-time data collection and monitoring were crucial for decision-making during the typhoon, allowing for proactive rather than reactive measures [8] Group 3: Rescue Operations - Emergency rescue teams were mobilized to respond to urgent situations, such as rescuing individuals trapped in dangerous conditions [9] - A KA-32 rescue helicopter was deployed to deliver supplies and evacuate injured individuals, demonstrating the effectiveness of coordinated emergency response efforts [12]