Why does the central region rain heavy and unusual floods? | News

10/26/2020 Vietnam



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In October, the central region suffered floods and floods, storms and storms, causing severe damage to people and property. Why are the rains and floods complicated in the central provinces in recent days and from now until the end of the year, how many more storms and floods will this land suffer?
Youth These questions have been referred to Mr. Nguyen Van Huong (photo), Head of the Climate Forecast Center of the National Hydrometeorological Forecast Center.
Why does the central region rain heavy and unusual floods?

Rain and floods broke many historical records

* Sir, the central provinces have never continually welcomed floods like in the past. How do you see this terrible natural disaster?

– It is a heavy rain, storm and flood that affect the central region. Due to the influence of a combination of dangerous weather patterns that act at the same time, the convergent tropical strip that passes through the center of Vietnam, together with the tropical cyclones that continuously form towards the continent of our country combine with the cold air and the northeast monsoon are continually complemented by the windbreaking topography of the Truong Son Range. The simultaneous combination of these patterns is the main cause of the recent heavy rains and floods in the central region.
The recent floods and rains in the central provinces show that natural calamities are increasingly fierce, unusual and unpredictable. At the beginning of the year, we are affected by a strong cold, large-scale hail, record heat, more concentrated and more concentrated rains and storms, plus heavy local rains, the floods are also deep, extensive and prolonged, causing seriously affecting the lives of people, especially in the Central region.

Storm No. 8 weakened, the central region will see many heavy rains

* The central rivers registered very high flood levels. Reviewing recent changes in flooding and rainfall, what has the hydrometeorology sector done, sir?

– Heavy rains fell continuously so that this flood had not yet receded before they accumulated. In the first flood, from October 6 to 14, the peak flooding on the Hieu River (Quang Tri) in Dong Ha was 4.69 m (measured at 13 o’clock on 8.10), exceeding the historical peak of flooding. in 1983 it was 0.11 m. The peak flooding on the Bo River in Phu Oc (Thua Thien – Hue) is 5.24 m (measured at 23:00 on October 9), surpassing the historical 1999 flood peak of 0.06 m.

The second flood, from October 16 to now, the flood peak on the Hieu River in Dong Ha (Quang Tri) continues to mark a new historical milestone with the flood level reaching 5.36 m (measured at 3 in point of October 18), exceeding the flood calendar. in 1983 it was 0.78 m, and the flood peak that was established earlier on August 8 was 0.67 m. The peak flooding on the Thach Han River in Thach Han (Quang Tri) was 7.4 m (measured at 2 o’clock on October 18), exceeding the 1999 historical flood peak of 0.11 m. In Quang Binh, the water level in the Kien Giang River in Le Thuy is 4.88 m (measured at 6 o’clock on October 19), which exceeded the historic peak of flooding in 1979 by 0.97 m.

We recorded, the rain during the day in some places was measured with extremely heavy rains. Specifically, on October 10, the rainfall in A Luoi (Thua Thien-Hue) reached 594 mm; On October 17, the rainfall in Khe Sanh (Quang Tri) was 582mm. In particular, on October 19, the rainfall in Hoanh Son (Ha Tinh) was 302 mm; while in Ba Don (Quang Tri), the precipitation is up to 756mm … If you compare the total precipitation measured in the day, this is the heavy rain never recorded in history.

130 people died, 18 disappeared

According to the Office of the Central Steering Committee for the Prevention and Control of Natural Disasters, according to statistics in the provinces of the Central and Central Sierra from October 6 to 25, the floods caused 130 deaths and 18 disappeared.

It is expected that there will be 2 to 4 storms that affect our country

* Typhoon No. 8 has just approached the central region, the East Sea is about to receive Typhoon No. 9 and is expected to also target Central Vietnam. This area just ran out of flooding, now storms and storms? How do you see this overwhelming natural disaster?

– At the beginning of the year the phenomenon of El Niño affects us, at the end of the year the phenomenon of La Niña affects us. The climate in many areas of our country has quite complicated developments. Severe heat at the beginning of the year, storms and heavy rains at the end of the year.

Particularly in the Central region, from October 5 to October 20, it rains almost every day very hard. According to statistics, precipitation in the first 20 days of October in many places has exceeded the many-year average by 100-200%. In Quang Binh, Quang Tri, Thua Thien – Hue, in many places rainfall has exceeded 300-400% compared to the many-year average. In particular, in Khe Sanh (Quang Tri), the total precipitation exceeds 628% compared to the many-year average. This year, the cold air arrives early and has a strong interaction with other weather systems such as storms, a tropical convergence band and high turbulence from the east wind, causing intense and prolonged rains in the central region.

In the immediate aftermath of Typhoon No. 8, the East Sea continues to receive Typhoon No. 9 and is expected to target the southern central provinces. Thus, only in October, the central provinces are continuously affected by 5 storms, low pressure tropical areas and low pressure areas. Also according to our statistics, historically, the number of 4 storms and 1 tropical depression that appeared in the same October only happened in 1983, this year is the second year in October with the number of storms, both tropical depressions appear.

The central region faces the risk of a repeat of the historic flood of 1983

* For the remainder of the rainy season this year, will the central provinces experience other heavy rains or storms and floods?

– It is anticipated that between now and the end of 2020, the East Sea region is likely to appear between 3 and 5 tropical storms and depressions. In which, there are 2-4 storms that directly affect the continent of our country, mainly in the central and southern regions. In the first month of 2021, there is still the possibility of a tropical cyclone occurring in the southern part of the East Sea and possibly affecting the South Central and South regions. In the central region, people must be vigilant and prepared to respond to heavy rains, especially heavy and prolonged rains, which can cause widespread flooding.

Due to the influence of the La Niña phenomenon, the extreme climate in our country is still complicated. People should be aware of the possibility of dangerous weather events such as thunderstorms, thunderstorms, tornadoes, hail throughout the country, especially during the seasonal change of seasons, in October and November. at sea, it is necessary to be careful with the strong winds caused by the impacts of the southwest monsoon on the sea south of the East Sea; Northeast wind of cold air in the north and middle of the East Sea in the main winter months of 2020 to 2021. In the Central and South Sierra, it is forecast that in the dry season 2020-2021, rains are likely to appear outside of season; The saline intrusion in the south will be sooner and fierce than the many-year average.

Storm No. 8 weakened and turned into a tropical depression causing heavy rains in the provinces from Nghe An to Thua Thien – Hue

The National Center for Meteorological and Hydrological Forecasting said that on the afternoon of October 25, Typhoon No. 8 weakened into a tropical depression in the sea from Ha Tinh to Quang Tri. After going inland from Ha Tinh to Quang Tri, the tropical low pressure is forecast to continue to weaken into a low pressure area. Due to the influence of the weakening of the tropical depression of Typhoon No. 8, the provinces from Nghe An to Thua Thien – Hue have moderate rainfall, heavy rainfall, with popular rains of 30 to 80 mm.

Also according to the National Hydrometeorological Forecast Center, at 7:00 p.m. on October 25, the Molave ​​storm center in the central region of the Philippines. Near the center of the storm, the strongest wind was level 11 to 12, that is, 100 to 135 km / h, impact level 14. It is anticipated that in the next 24 to 48 hours, the storm will move mainly to the west and to the eastern sea. becomes storm number 9 this year. At 7:00 p.m. on October 26, the center of the storm was about 450 km northeast of Gemini Island. The area near the center of the storm had the strongest wind power at level 12, that is, 115 to 135 km / h, level 14.

This morning, October 26, the Central Steering Committee for Disaster Prevention and Control held a meeting with ministries and agencies to guide the response to the Molave ​​storm heading towards the South China Sea.

P. Hau



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