Strong Wind
Overview
A strong wind (강풍, strong wind) is defined meteorologically as wind with an instantaneous speed of 15 m/s (meters per second) or more. This level can cause trees to sway, make walking difficult, and disrupt outdoor work. Strong winds occur under various meteorological conditions such as typhoons, low-pressure systems, frontal passages, and topographic effects. In particular, the Korean Peninsula experiences frequent strong winds in spring and autumn. Beyond mere discomfort, strong winds can cause serious disasters such as facility damage, traffic paralysis, wildfire spread, and maritime accidents, making them subject to advisories and warnings issued by the Korea Meteorological Administration.
Main Content
Definition and Classification of Strong Winds
The Korea Meteorological Administration classifies strong winds by stage as follows:
- Strong Wind Advisory: Issued when wind speeds of 14 m/s or more or instantaneous wind speeds of 20 m/s or more are expected on land.
- Strong Wind Warning: Issued when wind speeds of 21 m/s or more or instantaneous wind speeds of 26 m/s or more are expected.
- Marine Strong Wind Advisory/Warning: At sea, lower wind speed criteria apply (typically 10–14 m/s), and these are announced in conjunction with wave heights.
Causes of Strong Winds
1. Pressure Gradient Force: The greater the pressure difference between a high-pressure and low-pressure system, the stronger the wind. For example, the pressure difference between the center and periphery of a typhoon can exceed 100 hPa, generating immense strong winds.
2. Topographic Effects: Winds passing through narrow valleys or over mountain ranges increase in speed due to the 'gorge effect' or 'mountain wave' phenomenon. The Yangganjipung (Yangyang-Ganseong local wind) in the Yeongdong region is a representative example.
3. Fronts and Low-Pressure Systems: When a cold front passes, cold air pushes warm air upward, causing strong gusts. Strong winds accompanying spring yellow dust (hwangsa) also fall under this category.
4. Local Phenomena: Squall lines, downbursts, and tornadoes can cause extreme strong winds in a short period.
Impacts and Damage from Strong Winds
- Human and Property Damage: Damage to signs, roofs, and vinyl greenhouses; accidents from falling objects; and overturning incidents. The 2022 container overturning accident on Jeju Island due to strong winds is a representative case.
- Traffic Paralysis: Flight cancellations (especially on Jeju and the southern coast), suspension of ship operations, reduced speed limits on highways, and suspension of railway operations.
- Industrial Damage: Agriculture (vinyl greenhouses, fruit drop), fisheries (damage to fishing nets and aquaculture facilities), and construction sites (crane and scaffolding overturning).
- Wildfire Spread: Strong winds drastically increase the spread rate of wildfires, leading to large-scale fires. Strong winds were a major factor in intensifying the 2019 Gangwon Province wildfires.
- Power Grid Damage: Strong winds can snap power lines or damage transformers, causing blackouts.
Preparedness and Response to Strong Winds
- Check Weather Information: Regularly monitor KMA advisories, smartphone apps, and disaster text messages.
- Inspect Facilities: Check the securement of outdoor signs, windows, roofs, and flower pots.
- Action Guidelines: Refrain from outdoor activities, take shelter inside buildings or underground, and park vehicles in safe locations.
- Government Response: When a strong wind special warning is issued, the KMA disseminates the situation to relevant agencies (National Fire Agency, Korea Coast Guard, local governments), sends disaster text messages, and activates emergency duty systems.
Latest Trends
As of 2024–2025, the frequency and intensity of strong winds are increasing due to climate change. In particular, the Korean Peninsula is seeing an increase in the number of strong wind days in winter and spring. In March 2024, strong wind warnings were issued simultaneously nationwide. The KMA is developing an AI-based ultra-short-term strong wind prediction model capable of forecasting gust risks within one hour with over 90% accuracy. Additionally, 'wind corridor forest' projects to reduce wind speed in urban areas are expanding in major cities such as Seoul and Busan, and automatic blade control systems for strong wind preparedness have been commercialized at offshore wind power complexes. From 2025, the criteria for strong wind special warnings will be subdivided, with a new 'very strong wind' stage to be introduced.
Related Topics
- [[Typhoon]]
- [[Weather Warning]]
- [[Gust]]
- [[Climate Change]]
- [[Wildfire]]
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