On the same day, some people experienced a heat wave while others saw rain.
That was the weather across the Korean Peninsula around August 10. Intense heat continued in the west while rain fell in the east, creating sharply different conditions people could feel.
3-Line Summary
1. At the time, the Korean Peninsula saw a weather pattern in which heat waves in the west and rain in the east occurred together.
2. Regional temperature differences resulted from the combined effects of wind direction, terrain, and the location of rain clouds.
3. Rather than relying on nationwide forecasts, it is safer to check advisories and hourly forecasts for the city or county where you are.
The Korean Peninsula’s Weather Split in Two
A Kyunghyang Shinmun forecast report published on August 9 said that the Korean Peninsula would see “heat waves in the west, rain in the east” the following day. Heat was expected to continue in some areas, including Daegu and the southern inland areas of North Gyeongsang Province, while precipitation was forecast as possible elsewhere.
Statements such as “it is hot nationwide” or “it will rain nationwide” often differ from what people actually experience. Mountains and coasts are close together on the Korean Peninsula, and even slight changes in wind direction or the location of cloud bands can create large east-west and north-south differences in temperature and precipitation.
Why Does It Feel Less Hot When It Rains?
Under rain clouds, sunlight is blocked, and raindrops absorb heat from their surroundings as they evaporate. In places with abundant cloud cover, daytime temperatures are less likely to rise as much. By contrast, in clear areas, strong solar radiation continues, causing temperatures to rise quickly.
However, rain does not always make it feel cool. If humidity is high and winds are weak after the rain stops, the apparent temperature may feel even higher. This is why it is important to consider humidity, wind, and whether it is raining—not just a single temperature figure.
Mountain Ranges and Wind Also Divide the Weather
As air crosses mountains, it rises and can form clouds and rain; as it descends on the other side, its characteristics can change. This is why the weather along the East Coast, inland, and in mountainous areas can differ even at the same time.
When winds along the edge of a high-pressure system, a stationary front, and locally developed shower clouds overlap, the contrast of “clear on one side and rainy on the other” becomes more pronounced. Therefore, even if a broad rain cloud band appears on a map, it is difficult to assume that every area will receive the same amount of rain.
A Practical Order for Checking the Weather
- In the morning, check the Korea Meteorological Administration’s city- and county-level forecasts and heat-wave and heavy-rain advisories.
- Just before going out, use radar imagery to check the movement of rain clouds.
- For outdoor activities, consider apparent temperature, ultraviolet radiation, and precipitation probability in addition to the day’s high temperature.
- In rainy areas, avoid places where danger can increase quickly, such as riversides, underpasses, and steep slopes.
Summer showers in particular can fall heavily over small areas in a short period. Information such as “our neighborhood was clear earlier” may not still be valid a few hours later.
Summary
Heat waves in the west and rain in the east are not an unusual combination, but a regional difference that can readily occur on the Korean Peninsula in summer. Clouds, wind, and terrain can transform the weather on the same day into several different patterns.
Read weather news through nationwide headlines, but make decisions based on local forecasts. If you have travel, a trip, or outdoor plans, check advisories and hourly precipitation information through the end.
References
- Kyunghyang Shinmun, Report forecasting heat waves in the west and rain in the east
- Korea Meteorological Administration, Weather Nuri
- Korea Meteorological Administration, Weather Advisories