2011 - Year of cold records

Mr. Le Thanh Hai, deputy director of the Central Hydrometeorological Center, said that 2011 was the year of cold records.

Citing the above statement, Mr. Hai said: " Since 1971, the average daily temperature (mid-March) in Hanoi has never dropped below 13 ° C, but on March 17, 2011 the temperature in Ha The Cabinet reduced to only 10.5 ° C, which could be considered a cold spell for many years .

According to statistics, from the beginning of the winter-spring crop to the first half of March 2011, the North suffered 20 waves of intensified cold air, including four cold-damaging cold spells.

It is noteworthy that at the beginning of January 2011, the intensified cold air continuously created a cold-damaging cold spell lasting up to 31 days (from 3.1 to 3.2).

Unusual snowfall in mid-March in Sapa

If in 2008, the cold wave lasted up to 38 days but mostly cold cold, the cold wave in early January favored more cold. Because of the continuous increase in cold air mass as the temperature in the North, the North and the Middle Central, it is 2.5-3.5 ° C lower than the average annual temperature, there are some places lower than 4 ° C.

In April 2011, it is forecasted that there will be 3-4 waves of cold air intensified to our country.

What are the unusual weather developments on do, sir?

As mentioned before, this year is the active year of La Nina phenomenon . The trend of this phenomenon makes the weather colder, more rainy season. The second reason is the impact of climate change. People often think climate change causes global warming, rising sea levels . However, the impact of climate change makes the climate rule relax on both sides. It means it's hot, it's cold, it's cold.

For example, in the early months of the year due to the cold air effect, the temperature in the North decreased. However, the temperature drop in January every year to appear snow in the northern mountainous areas like Sa Pa is rare. By the middle of March, snow appeared more dense as an expression of climate change.

What about the rain situation, sir, especially in the South in the past few days, there has been continuous rains on the large scale?

The intensified cold air is also an agent causing rain in the North - Central and South Vietnam. The total amount of rainfall in the first three months of 2011 nationwide is approximately the same as the average for many years.

In the South, the cold air also combined with the high-altitude winter wind disturbances caused unseasonal rain. As noted in the South, there were two unseasonal rains on a large scale from 5 to 8-3 and the second one took place from March 21 until now.

There have been localities having unseasonal rainfall with a flow greater than 100mm as in Bac Lieu on March 22. These rains have unusual developments in addition to the heavy and prolonged rainfall that makes many parts of the South like the rainy season. However, this season's left rain will be over when the cold air raises the end.

Rain so much in the season is it expected that the rainy season in the South this year will come sooner?

In the South, the rainy season only really starts with the development of southwestern winds (the current monsoon rains mainly affect the northeast monsoon). The rainy season in the South this year is likely to arrive earlier than the average of many years. It is expected that in the first 10 days of May, the Central Highlands and the South will start in the rainy season. Focused on the rainy first half of the rainy season. Particularly in Northern and Central Vietnam, heavy rains focused on May to July.