According to information from Lao Cai Hydrometeorological Station, this area recorded a very rapid increase in temperature in the period from May 22 to 27.
Cloudy skies, prolonged strong sunshine make the highest temperature commonly at 35 - 37 degrees C, especially some low-lying areas may reach the threshold of 38 degrees C.
The peak period of the heat wave falls from about May 24 to May 27. Compared to the average of 30 - 34 degrees Celsius in May every year, this heat wave has significantly exceeded the threshold. Hot air covers even at night when the temperature is maintained at 26 - 29 degrees Celsius.
A similar stuffy situation also occurred in Cao Bang. At noon on May 23, the temperature at Bao Lac station reached 35.6 degrees Celsius; Cao Bang city 34.6 degrees Celsius.
It is forecasted that on May 24 and 25, the temperature here will continue to maintain at 35 - 37 degrees Celsius, while the humidity will drop extremely low, only 40 - 45%.
In Son La, weather diễn biến is somewhat more complicated due to the disruption of atmospheric mass.
In the period from May 22 to 27, the whole province will experience widespread hot weather. However, from May 26 to 31, when the low pressure trough is gradually pushed south in combination with the high-altitude wind convergence zone being re-established, Son La will experience interspersed weather patterns.
Daytime is maintained with intense heat, but in the late afternoon and night there are scattered showers and thunderstorms. It will not be until the end of May that the whole region is likely to have more uniform thunderstorms, helping to reduce the temperature.
The interweaving of high temperatures and atmospheric disturbances brings very high risks of natural disasters.
The meteorological agency especially warns that during cooling thunderstorms, the risk of tornadoes, lightning, hail and strong gusts of wind is very high.
These phenomena can cause trees to fall and factory roofs to be blown off. More dangerously, localized thunderstorms are likely to trigger flash floods and landslides on steep hillsides.
In addition, low air humidity also pushes the risk of fires and forest fires to an alarming level.
People are advised to limit outdoor activities at noon, proactively replenish water to prevent exhaustion and heat shock.
