On the last weekend of August, the phrase “monsoon-like rain” is drawing attention.
If it rains heavily, should we consider the monsoon season to have started again?
What matters more in this forecast than the label is which day and which areas the rain clouds will remain over.
3-line summary
1. Monsoon-like rain is not an official monsoon designation
2. Strong rain in the southern region on the 30th remains at the forecast stage
3. Check the location of rainfall again before departing
It is not a resumption of the monsoon, but may be a stationary front
The Korea Meteorological Administration explained that it does not call this rain an autumn monsoon or a second monsoon. Rainfall caused by a stationary front from late August to early September can be a weather phenomenon that commonly occurs, it said. The phrase “at monsoon-season levels” is better understood as referring to the possibility that a rain cloud band may develop narrowly and intensely.
The key point is that hot, humid air and cold, dry air may collide near the Korean Peninsula. If the two air masses are evenly matched, a narrow, belt-like rain cloud band may form, and if it moves slowly, rainfall may become concentrated in particular areas, the Korea Meteorological Administration forecast.
Therefore, it is difficult to conclude that monsoon rain will fall evenly nationwide. Even within the same region, the timing and intensity of rainfall may vary. The most important point to watch in this announcement is not the total amount of rain, but whether the rain cloud band will remain over one area for a long time.
Rain is expected to begin in the southern region on the 28th and spread nationwide on the 29th
According to reports, rain was forecast mainly south of Chungcheong on the 28th, while some areas of the Seoul metropolitan area and inland Gangwon may see showers. Expected precipitation of 30–80 mm was presented for Yeongnam, and 10–70 mm for Chungcheong and Honam. This is a forecast at the time of the announcement, not observed rainfall.
On the 29th, rain is expected to expand nationwide under the influence of a low-pressure system approaching from near the Shandong Peninsula. The Korea Meteorological Administration mentioned the possibility of 20–60 mm or more of rain nationwide. This means rain may spread widely that day; it does not mean that rain in all areas will continue at the same intensity.
On the 30th, the possibility of heavy rain mainly in the southern region was raised. Because the movement and weakening process of Typhoon Saudel, the 18th typhoon, and the location of the North Pacific High could shift the position of the stationary front, the location of precipitation and precipitation amounts for the 30th–31st are still highly variable.
“Concentration in the southern region” is not a confirmed outcome, either
Rain may continue in the southern region through the 31st. However, the pattern may change if the rain cloud band moves quickly, and the Korea Meteorological Administration explained that the possibility of the precipitation area expanding to the central region, depending on the speed of the low-pressure system, cannot be ruled out.
For that reason, when making weekend plans, it is more practical to check the latest forecast for the area where you will be staying than to rely on the single statement that “the monsoon has arrived.” In particular, if you have outdoor plans or travel time, you should separately check when rain is expected to begin and the periods when heavy rain is expected. As actual observations accumulate, the boundaries and intensity of this rain may change, so checking immediately before departure should be the basis for your decision.
What to look for when reading the next announcement
It is difficult to reach a conclusion from monsoon-related news based on a single number or sentence. The meaning becomes clearer when you distinguish who made the announcement, whether it refers to an already implemented fact or a future plan, and whether the target and timing are specifically stated.
Even within the same material, explanations of necessity, discussions, implementation plans, and actual implementation may represent different stages. Even if the scale of an announcement appears large, you should also check what it applies to and what procedures remain, so as not to overstate or understate the current situation.
In subsequent news, compare whether a new announcement repeats existing information or whether the target, schedule, or implementation status has actually changed. Reviewing the related reports below together can also help identify differences in wording that may be easy to miss from the headline alone.
References
Tags #Monsoon #MonsoonLikeRain #WeekendWeather #NationwideRain #SouthernRegionRain #StationaryFront #HeavyRainfall #TyphoonSaudel #KoreaMeteorologicalAdministrationForecast #LateAugustWeather #RainForecast #Precipitation #WeekendTravelWeather