Northern Vietnam is experiencing a widespread heatwave, with temperatures approaching 40°C in many areas. In Hanoi today, 4 out of 5 monitoring stations recorded temperatures above 39°C. Lang station registered the highest temperature at 39.7°C, while Hoai Duc had the lowest at 38.5°C, both increasing by 1-3°C compared to yesterday. Other stations recording temperatures above 39°C include Nho Quan and Phu Ly (Ninh Binh); Lac Son and Hoa Binh (Phu Tho). These are temperatures measured inside weather stations; actual outdoor temperatures may be 1-3 degrees higher depending on the terrain.
Experts observe that extreme weather events are becoming more frequent, prolonged, and intense, negatively impacting public health. Dr. Huynh Tan Vu of the University of Medicine and Pharmacy Hospital in Ho Chi Minh City warns that during these extreme heat waves, the risk of stroke increases significantly, especially for the elderly and those with pre-existing conditions. As the body struggles to adapt to high temperatures, sweat glands work overtime to cool down, leading to significant loss of water and electrolytes. Blood becomes thicker, its viscosity increases, causing a rise in blood pressure and creating conditions for blood clot formation. These are leading factors contributing to strokes.
In addition to the heat, low atmospheric pressure is also a silent threat. Dr. Nguyen Ngoc Huy, an expert on climate change and disaster warnings, explains that northern Vietnam is affected by a low-pressure system, resulting in a feeling of suffocation.
"Atmospheric pressure between 3 PM and 5 PM today is forecast to drop to 998 hPa, the hottest and most stifling time of the day," Huy said, adding that the temperature will range from 37-38°C, reaching 39°C in some areas. The perceived temperature could reach 44-45°C.
Low atmospheric pressure means the atmospheric pressure in a given area is at 998 hectopascals, lower than the average (1,013.25 hPa). This signals impending adverse weather conditions. Low pressure often brings thick clouds, overcast skies, rain, thunderstorms, and even tropical depressions or typhoons (if it drops further).
When atmospheric pressure drops, people may experience fatigue, shortness of breath, and headaches. For those with a history of migraines, this change can trigger recurring pain. Low pressure also alters the pressure on joints and soft tissues, causing a dull ache in older adults or those with chronic arthritis. In particular, people with low blood pressure may experience dizziness, lightheadedness, and difficulty concentrating when moving suddenly in this weather.
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Heat in Hanoi. Photo: Giang Huy |
Heat in Hanoi. Photo: Giang Huy
Experts recommend monitoring weather forecasts for proactive prevention. The elderly should avoid going out and working during hot days, especially during peak hours from 10 AM to 4 PM. When outdoors, they should wear hats and drink plenty of water. Elderly individuals with cardiovascular diseases or a history of stroke should avoid sun exposure after 10 AM.
Avoid strenuous work or activities when feeling tired, hungry, or thirsty outdoors in the sun. Wear long-sleeved shirts and wide-brimmed hats to protect skin from the sun. Clothing should be light and made of breathable materials. Avoid sudden transitions from air-conditioned rooms to direct sunlight; allow time to acclimatize to the outdoor temperature.
Set air conditioners to 26-28°C. Homes can be cooled by blocking sunlight, opening windows for ventilation, and using fans. Drink water regularly to prevent dehydration, supplementing with fruit juice and vegetables.
Other important factors include stress management, a healthy diet rich in fruits and vegetables, adequate sleep, blood pressure and blood sugar control, avoiding alcohol and tobacco, and regular health checkups.
Thuy Quynh
