Heavy Rain Advisory Lifted
Overview
The lifting of a heavy rain advisory refers to the official procedure by which the Korea Meteorological Administration (KMA) declares that a previously issued heavy rain advisory is no longer valid. Beyond merely ending weather information, it serves as a signal for citizen safety and the restoration of social functions. A heavy rain advisory is typically issued when cumulative rainfall is expected to reach 60mm or more over 3 hours, or 110mm or more over 12 hours, and is lifted when these conditions have dissipated.
Main Content
Criteria for Lifting a Heavy Rain Advisory
The lifting of a heavy rain advisory is determined according to the KMA's 'Criteria for Issuing Weather Special Warnings.' The main criteria are as follows:
- Decrease in Rainfall Intensity: When cumulative rainfall over 3 hours is expected to be less than 30mm
- Prediction of Rainfall Cessation: When radar and satellite analysis indicates that the rain band is dissipating or moving away
- Consideration of Regional Characteristics: Reflecting drainage capacity and terrain by region, such as mountainous, coastal, and urban areas
- Forecast Accuracy: Evaluation of the consistency and reliability of numerical forecast models
Lifting Procedure
1. Collection of Meteorological Data: Real-time analysis of data from AWS (Automatic Weather Stations), radar, and satellites
2. Forecaster Judgment: KMA forecasters make a comprehensive assessment to decide whether to lift the advisory
3. Official Announcement: Immediate notification via the KMA website, mobile app, and disaster text messages
4. Notification to Relevant Agencies: Dissemination to related organizations including the Ministry of the Interior and Safety, local governments, police, and fire departments
Social Impact
The lifting of a heavy rain advisory has the following effects:
- Resumption of Economic Activities: Restart of halted economic activities such as factories, construction sites, and agriculture
- Normalization of Transportation: Lifting of controls on aircraft, ships, railways, and roads, leading to normalization of logistics and movement
- Psychological Stability: Alleviation of public anxiety and return to daily life
- Acceleration of Disaster Recovery: Full-scale emergency recovery operations and transition to support systems for disaster victims
Precautions When Lifting
- Risk of Delayed Effects: Possibility of secondary damage such as landslides and flooding even immediately after the advisory is lifted
- Information Transmission Errors: Delays or omissions in text messages or broadcasts about the lifting can cause confusion
- Avoid Overconfidence: Continued attention to weather changes is necessary even after the advisory is lifted
Latest Trends
As of 2024-2025, the system for lifting heavy rain advisories is being advanced using artificial intelligence (AI) and big data. The KMA has introduced an 'AI-based Rainfall Prediction System,' improving the accuracy of the lifting timing by over 15%. Additionally, starting in 2025, 'nowcasting' technology enables real-time reflection of rainfall changes within one hour, allowing for faster decisions on lifting advisories. Particularly in urban areas, a pilot system is being operated that links lifting information with traffic signals, drainage pumps, and underpass barriers through a 'Smart City Safety Network.' Due to an increase in localized heavy rainfall from climate change, the lifting criteria are becoming more flexible. In 2024, 'regionally customized lifting criteria' were introduced to reflect differences between mountainous and flat areas, and between urban and rural regions. Furthermore, some local governments have adopted a 'phased lifting' method that maintains a 'caution stage' for 24 hours after the advisory is lifted.
Related Topics
- [[Heavy Rain Advisory]]
- [[Weather Special Warning]]
- [[Natural Disaster Response]]
- [[Climate Change]]
- [[Disaster Text Message System]]
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