According to the National Center for Hydro-Meteorological Forecasting, last night and early this morning (March 30), the Northern region had scattered showers and thunderstorms, with locally heavy rain. Rainfall from 7 pm on March 29 to 3 am on March 30 was over 35mm in some places such as: Phu Binh (Tuyen Quang) 44.2mm, Yen Thinh (Thai Nguyen) 42.2mm, Na Sam (Lang Son) 39.2mm, Tan Tien (Lao Cai) 38.4mm...
On the morning of March 30, the Northeast region and the Northern Delta will have scattered showers and thunderstorms, locally heavy rain with rainfall over 30mm.
Notably, people in Viet Hung ward (Hanoi) said that in the early morning of March 30, 2 periods of hail rain appeared in the ward. The rain time was short but the intensity of the rain was quite strong. Initially, the size of the stones was only the size of a fingertip, then gradually grew to the size of a cup.
Previously, on the afternoon of March 29, ice rain also appeared in Son Tay ward (Hanoi). Stones as big as fingertips, continuously falling down for about 15 - 20 minutes. People said that ice rain appeared in a short time, each stone was small in size, so it did not cause serious consequences.
Last week, thunderstorms accompanied by tornadoes occurred on March 21-22, causing damage in Lao Cai, Lai Chau and Dien Bien provinces. In the afternoon of March 22, widespread thunderstorms appeared in some provinces such as Son La, Phu Tho and Lao Cai. Many areas recorded hail with particles with a diameter of 1 - 3cm.
Regarding this weather phenomenon, according to Dr. Truong Ba Kien - Deputy Director of the Center for Meteorology and Climate Research - Institute of Meteorology, Hydrology, Environment and Marine Science, the continuous appearance of hail and thunderstorms in the second half of March is consistent with the climate law.
Dr. Truong Ba Kien analyzed that in a year there are two main seasonal transition periods: transition from spring to summer, from summer, autumn to winter.
These are periods of risk of extreme weather phenomena such as thunderstorms, tornadoes, hail,..." - Mr. Kien said.
According to meteorologists, the reason is that the transitional period is the transitional period between large-scale circulation systems, with the dispute of two gas masses with completely different characteristics.
For example, in March, the weather changes from cold air of winter to warm air of summer. The interaction between two air masses of opposite nature, one hot and humid and one dry and cold, easily triggers thunderstorms, tornadoes and hail" - Dr. Truong Ba Kien analyzed.
Dr. Kien added that, similar to March, the period of September and October is also a seasonal transition from summer and autumn to winter. At this time, natural disasters such as thunderstorms, tornadoes, hailstorms or tornadoes also often occur...
