[Day 5] 2024.11.28
A record-breaking snowfall.
low pressure effect
colder than usual
Snowfall Extreme Record
1. Pressure system
[ 500hPa weather chart 2024-11-28 09KST ]
[ 500hPa weather chart 2024-11-28 21KST ]
As the blocking high over the Sea of Okhotsk weakens, the low-pressure center has stopped moving southward and is now shifting eastward. However, the Korean Peninsula remains under the influence of the low and its associated trough.
[ 850hPa weather chart 2024-11-28 09KST ]
[ 850hPa weather chart 2024-11-28 21KST ]
Across most of the Peninsula, the difference between the air temperature and dew point is within 3°C, indicating a humid and moisture-laden atmosphere. While humidity is gradually decreasing through the afternoon, cold air advancing from the northwest is causing temperatures to drop further, and strong winds are increasing the likelihood of snow or rain, particularly along the western coastal areas.
Cold air from the cut-off low to the north of the Korean Peninsula is being drawn in more strongly due to the pressure gradient between the low and a surface high-pressure system formed over inland China, where air is subsiding. As a result, strong winds are driving even colder air southward into the Korean Peninsula.
[ Surface weather chart 2024-11-28 09KST ]
[ Surface weather chart 2024-11-28 21KST ]
With the influx of cold northwesterly winds, temperatures have dropped sharply, and heavy snowfall has resulted in significant accumulation.
The Total Totals Index (TTI) indicates elevated atmospheric instability over the central parts of the Korean Peninsula and the East Sea, confirming the effects of the low-pressure system in these regions.
2. Clouds & Precipitation
[ Infrared imagery 2024-11-28 09KST ]
[ Infrared imagery 2024-11-28 21KST ]
On the morning of November 28, the infrared satellite image showed a thick, bright cloud band over Korea and the East Sea, indicating widespread high-level cloudiness associated with ongoing precipitation. By the evening, the cloud system had moved eastward with the departing trough, and clear skies prevailed over much of the Korean Peninsula. Infrared imagery effectively captures the vertical development of clouds and correlates closely with actual surface weather conditions.
[ 2024-11-28 09KST ]
[ 2024-11-28 21KST ]
Widespread precipitation covered Korea, with snow in the north, rain/snow mix in central regions, and rain in the south. By evening, the system had shifted eastward and southward, weakening snowfall in the north and expanding rainfall over the southern and eastern regions. Mixed precipitation zones gradually narrowed, and most areas transitioned into rainfall-dominant conditions.
3. Temperature
It's 09 KST skew-T log P diagram on the 28th. The maximum temperature of 28th obtained using moist adiabat is predicted to be 2°C.
It's 03 kst skew-t on the 29th. We predict the lowest temperature on the 29th using moist adiabat . The minimum temperature on the 29th is predicted to be 0°C.
4. Summary
- Large amounts of snow recorded
- Gradually, the low pressure is moving eastward