According to the Southern Hydrometeorological Station, in the first week of May, continental cold high pressure will continue to have weak intensification waves, shifting eastward towards southern China and the northern region of our country. The hot low pressure from the West develops and gradually expands eastward. Above, the subtropical high pressure maintains its main operating axis through the Central region and the central East Sea.
The South is mainly affected by the Southeast edge of the hot low pressure area to the West at the low level, combined with the southern edge of the subtropical high pressure at high altitude. Winds in the first week tend to change direction, then switch to Southwest winds with intensity from weak to moderate.
Compared to April, rainfall in May tends to increase, generally at a level close to or lower than the multi-year average (TBNN). Temperatures slightly decrease, maintaining at a level close to or higher than the TBNN, hot sun tends to gradually decrease. The possibility of tropical cyclones appearing in the East Sea during this period is low.
The average temperature in May decreased slightly compared to the previous month. The highest temperature is commonly 31-34 degrees C, in some places up to 35 degrees C; especially Lam Dong is commonly 29-32 degrees C. The lowest temperature fluctuates from 24-27 degrees C, the eastern region is in some places down to 23 degrees C, Lam Dong from 20-23 degrees C.
Total rainfall in May increased compared to April but is still at a level close to or lower than the TBNN. The number of rainy days is commonly 13-20 days; especially Lam Dong is about 20-25 days. Hot weather may still appear locally in the near future.
According to Mr. Tran Van Hung - Deputy Director of the Southern Hydrometeorological Station, compared to the average of many years, rain this year came late, causing the total rainfall in April to decrease significantly. The main reason is that ENSO is in a neutral state but leaning towards the El Nino hot phase, causing the subtropical high pressure to operate strongly, creating a dry and hot atmosphere, prolonging hot weather and limiting widespread rain.
In the short term, at the beginning of May, thunderstorms tend to increase, but mainly occur locally in the late afternoon and evening. This year's rainy season is forecast to start late, possibly from mid-May to become clear. Notably, the total rainfall in the rainy season months tends to be close to or lower than the multi-year average; it is unlikely that prolonged heavy rains will occur on a large scale, instead of intermittent rain periods.
