Storm No. 5 increases in intensity when making landfall, causing widespread heavy rain

Bão số 5 tăng cường độ khi đổ bộ vào đất liền, mưa lớn trên diện rộng- Ảnh 1. — Image of storm No. 5 at 12 noon on August 25

Information at 12 noon on August 25, the National Center for Hydro-Meteorological Forecasting said that the center of the storm was at about 18.5 degrees North latitude; 106.5 degrees East longitude, about 85km East Southeast of Nghe An, about 65km East of Ha Tinh , about 135km East Northeast of North Quang Tri. Strongest wind: Level 13 (134-149km/h), gusting to level 16.

Forecast: In the next 3 hours, the storm will move in the West Northwest direction, at a speed of about 15km/h.

From now until the afternoon when the storm moves into the sea area of Ha Tinh - Thanh Hoa, the storm will maintain its intensity at level 14, gusting at level 15-16. When approaching the coast of Ha Tinh - Nghe An, the intensity may decrease to late level 13 early level 14.

On land, in the North Thanh Hoa area, there are strong winds of level 8-9, gusting to level 10-11; in the South Thanh Hoa-North Ha Tinh area, there are strong winds of level 10-11, near the storm center, level 12-14, gusting to level 15-16 (Radius of strong winds above level 12 around the storm center is about 50km); in the South Ha Tinh, Quang Tri, coastal areas of provinces from Quang Ninh to Ninh Binh, there are strong winds of level 6-8, gusting to level 9-10.

Deep inland in the South Thanh Hoa - Ha Tinh area, about 50-70km from the coast, strong winds level 8-9, gusts level 11-12; further inland, the part bordering Laos, strong winds level 6-7, gusts level 7-8.

Strong wind time: Strong winds on land in the provinces from Thanh Hoa to Quang Tri began to appear from the morning of August 25. The strongest wind time is from 12 noon to about 6 pm.

From the morning of August 25 to the end of August 26, in the midlands and deltas of the North, Lao Cai area and from Thanh Hoa to Hue city, there will be widespread heavy rain with common rainfall of 100-150mm, locally over 250mm; in particular, the area from Thanh Hoa to Northern Quang Tri will have heavy to very heavy rain with common rainfall of 200-400mm, locally over 600mm. Warning of the risk of heavy rain (>200mm/3 hours).

Storm No. 5 is still strong as it approaches land.

Meteorological experts said that the forecasts for the intensity of storm No. 5 are still strong when approaching the mainland. Firstly, storm No. 5 moves over the central sea with water surface temperatures reaching 30°C; at the same time, it is energized by the southwest monsoon from the Bay of Bengal and the east wind of the subtropical high pressure tongue, so the possibility of the storm maintaining its strong intensity is very high.

Second, the vertical wind shear of this storm is small at 2.5 m/s in the southern Gulf of Tonkin, which is favorable for the storm to maintain its intensity when approaching the shore.

Third, the circulation of storm No. 5 is less affected by friction with the terrain of Hainan Island, so its structure is not broken.

Forecasts from weather models calculated by Vietnam and internationally all predict that the storm will continue to maintain its strong intensity as it approaches the shore.

When moving into the coastal area, friction increases, the influence of the northwest part of the subtropical high pressure tongue (the shape that determines the path of storm No. 5) will make the storm less symmetrical, the axis tilts more to the north, so it will reduce its intensity.

According to experts, the intensity forecast when making landfall is highly consistent among international forecasting agencies such as: Japan and Beijing (China) are both level 13-14; Hong Kong (China) level 14.

Thu Cuc

Source: https://baochinhphu.vn/bao-so-5-tang-cuong-do-khi-do-bo-vao-dat-lien-mua-lon-tren-dien-rong-102250825122014506.htm