8/5 Forecast

1. Pressure System

1. Surface Pressure

The low-pressure system near the Korean Peninsula has dissipated, and a high-pressure system has formed, resulting in clear and cloud-free weather.

At 21 KST, the high-pressure system over inland China moves eastward, approaching the Korean Peninsula.

2. 850hpa

The center of the high-pressure system remains over the Korean Peninsula, maintaining a generally stagnant pattern.

Temperatures aloft are similar to the previous day, but by 21 KST, isotherms shift northward, indicating rising temperatures.

A clockwise flow brings in weak southwesterly winds. Warm advection is forming, increasing the chance of warm air inflow.

Wide contour spacing and persistent high pressure limit atmospheric mixing, making nighttime cooling difficult and raising the likelihood of tropical nights.

2. Wind

850hpa Stream Line & Isotach

At 850 hPa, a anticlockwise flow forms along the low-pressure system over northern Korea, with areas where wind speeds exceed 25 knots.

Under the influence of this cyclonic circulation, southwesterly winds dominate over the peninsula, and streamlines are relatively dense, indicating organized airflow.

By 21 KST, the influence of the northern low weakens, streamlines over the peninsula become more widely spaced, and a generally weak, stagnant wind pattern is observed.

3. Precipitation/ Humidity

High likelihood of precipitation, especially strong convective precipitation in central inland and west regions.
High moisture convergence with southwest wind-based lower jets, and 35-40 K-index overlap, resulting in local torrential rain, thunderstorms, and gusts.

850hPa Moisture Flux

Wet southwest wind air flows in over the Korean Peninsula. Moisture converges to central and southern parts of the Korean Peninsula
Water convergence from the southwest sea to the inland of the Korean Peninsula -> High likelihood of precipitation

850hPa Streamline and Isotach

There is a lower jet flowing from the southwest to the northeast.
In particular, strong wind bands with wind speeds ranging from 25 to 50 kt from the southern sea to the Korean Peninsula are introduced
High likelihood of convective activity with active water vapor transport

1000-500hPa Thickness & 700hPa T-Td

Dense stratum line in the northern part of the Korean Peninsula -> Changes in barometer active
Distribution of low wet water values in central inland and southern parts -> Humidity high
High probability of precipitation

K-index

Overall, it is distributed over 30 to 40 and above, especially in the central inland and southern regions
When combined with marine tropical end and lower jet in summer, the possibility of strong thunderstorms or local heavy rain is very high
Thunderstorm intensity is also high → Lightning, gusts, and local torrential rain warning.

4. Cloud

Irregular and scattered low-level clouds of gray to medium brightness are widely distributed across the Korean Peninsula.

5. Temperature

2024.08.05|21KST

As of 9 AM on August 5th, following the dry adiabat line from the 850 hPa temperature on the thermodynamic chart down to the surface, the maximum temperature is expected to be approximately 34°C.

2024.08.04|21KST

As of 9 PM on August 4th, the minimum temperature in Seoul on August 5th is expected to be approximately 26°C.

8/5 Observation

1. Wind

2. Precipitation

Heavy rain warnings in Chungcheongbuk-do/Chungcheongnam-do, Gangwon-do, and parts of southeastern Gyeonggi-do

There was precipitation with strong gusts across the country.

3. Temperature

Daily average

→ All of South Korea is recording high temperatures around 30°C or higher

Climate deviation

It looks less pink than the day before, and some areas have a temperature deviation of +-0.5°C

Standard score

Most of the regions in the country's Z-Score is 0.25, 0.5 or higher, and there are also regions having Z-Score of +-0.25

Maximum temperature is 33.7°C, 2.7°C above last year(31.0°C)
Minimum temperature is 26.9°C, 2.8°C above last year(24.1°C)