The heat is particularly intense, mainly concentrated in the second half of June.

From mid-June, the average temperature tends to be about 0.5-1.0 degrees Celsius higher than the average of many years, the heat increases again with a particularly severe level.

In May, many places had record heat.

Mr. Nguyen Duc Hoa, Deputy Head of Weather Forecast Department, National Center for Hydro-Meteorological Forecasting, said that in early May 2023, a tropical depression appeared in the East Sea on May 5, 2023; the tropical depression moved slowly and weakened in the central area of ​​the East Sea on May 7, 2023.

In May 2023, there were 4 thunderstorms and hailstorms on the following days: May 7 in Dai Kai, Sung Nhon communes, Duc Tai town, Binh Thuan province and in Quang Hoa, Ha Quang, Trung Khanh districts, Cao Bang province; May 8, in San Chai, Nan San communes - Si Ma Cai district, Lao Cai province and in Quang Binh, Hoang Su Phi, Yen Minh, Vi Xuyen, Bac Quang districts, Ha Giang province; May 18 in Phan Huyen, Bac Binh, Binh Thuan. Afternoon of May 24: heavy rain with hail in Son Ha mountainous district. During the month, there were also 2 cold air waves on May 7 and May 12. These cold air waves both reduced the temperature and caused rain in the Northern and North Central regions.

Severe heat is concentrated in the second half of June.

In May, there were 5 large-scale heat waves, including the period from 01-07/05 in the South; the period from 04-07/05 in the North, Central and Central Highlands; the period from 18-19/05 in the South, the period from 16-23/05 and the period from 27-30/05 in the North and Central. Notably, the severe and especially severe heat wave from 04-07/05, many places had values ​​exceeding the historical values ​​(GTLS) observed in the same period. The places that can be mentioned are Tam Duong (Lai Chau), Muong La (Son La, Song Ma (Son La), Yen Chau (Son La), Moc Chau (Son La), Mai Chau (Hoa Binh), Pho Rang (Lao Cai), Bao Lac (Cao Bang), Mong Cai (Quang Ninh), Ha Dong ( Hanoi ), Nho Quan (Ninh Binh)...

Notably, in Tuong Duong (Nghe An), the absolute highest temperature value was observed at 44.2C on May 7 and was considered the highest daily temperature value ever observed in the country (the old value was 43.4C in Huong Khe ( Ha Tinh ) occurred in April 2019).

In May 2023, the average temperature in the North, North Central and Central Central regions was generally 1.0-1.5 degrees Celsius higher; in the Northeast region, it was 0.5-1.0 degrees Celsius higher, and in the South Central, Central Highlands and South regions, it was 0.5-1.0 degrees Celsius higher than the average of many years. During the month, there were also 03 widespread rains concentrated in the North and the provinces from Thanh Hoa to Thua Thien Hue.

Total rainfall in May 2023 is unevenly distributed across the country. In the North and Central regions, it is generally 40-80% lower than the average for the same period in many years, while in some places in the South Central, Central Highlands and South regions, it is 20-50% higher.

The second half of June is the peak of the heat.

Mr. Nguyen Duc Hoa said that the average temperature forecast for June 2023 in regions across the country is generally 0.5-1.0 degrees Celsius higher, in some places higher than the average of many years in the same period. The Northern region will also experience heat waves in the first days of the month, after which the intensity of heat waves will temporarily decrease. From mid-June, the average temperature will tend to be about 0.5-1.0 degrees Celsius higher than the average of many years, and heat waves will increase again. The Northern and Central regions are likely to experience many hot days, with the number of hot days being higher than the average of many years.

It is forecasted that in June 2023, rainfall in the Northern, North and Central Central regions will generally be 10-20% lower than the average of many years; in the South Central region it will be approximately the same; in the Central Highlands and the South, it will generally be 5-20% higher than the average of the same period. During the month, storms/ tropical depressions are likely to be active in the East Sea and affect the Northern and North Central regions.

In the Central Highlands and the South, there were many days of showers and thunderstorms during the month; in the North and North Central regions, rain tended to concentrate in the middle and end of the month, however, the total monthly rainfall still tended to be lower than the average of many years. Throughout the country, continue to be on guard against thunderstorms, tornadoes, lightning, and hail (more concentrated in the North, North Central, Central Highlands, and the South).

Due to the impact of hot weather, concentrated in the Northern and Central regions, beware of the risk of fire and explosion in residential and production areas due to increased demand for electricity and the high risk of forest fires. In addition, dangerous weather phenomena such as thunderstorms, tornadoes, lightning, and hail continue to appear nationwide, which can greatly affect production and people's activities.

Regarding the heat wave currently occurring in the North and Central regions, the National Center for Hydro-Meteorological Forecasting said that today (June 1), in the North and the area from Thanh Hoa to Phu Yen, there will be hot and extremely hot weather, with some places being especially extremely hot with temperatures at 1 p.m. this afternoon generally ranging from 35-37 degrees, with some places above 39 degrees such as: Muong La (Son La) 41.1 degrees, Bac Me (Ha Giang) 39.2 degrees, Bao Lac (Cao Bang) 40.8 degrees, Tay Hieu (Nghe An) 39.2 degrees. Relative humidity at 1 p.m. is generally 42-65%.

On June 2 and 3, the North and the area from Thanh Hoa to Thua Thien Hue will have hot and extremely hot weather, some places will be especially hot with the highest temperature commonly ranging from 36-39 degrees, some places will be over 40 degrees; the lowest relative humidity is commonly 40-60%; the area from Da Nang to Phu Yen will have hot weather, some places will be extremely hot with the highest temperature commonly ranging from 35-37 degrees, some places will be over 37 degrees; the lowest relative humidity is commonly 50-65%. From May 4, the hot weather in the North and the area from Thanh Hoa to Phu Yen will tend to ease.

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