Monsoon season
· Monsoon season, tiếng viet gọi là Mùa Gió Chướng
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Indochina marks the mainland part of
the Southeast Asian peninsula. The pattern is quite simple: the southwest
monsoon, normally called the rainy season, is appearing annually out of the
direction of India and south of it, crossing the Indian Ocean and moving into
the countries Malaysia, Thailand Cambodia, Viet Nam and Burma/Myanmar. Much of
it is pouring down at the bordering mountain ranges as the Barisan Mountains in
Sumatra and the Tenasserim Mountain Range in south Thailand. As further it
penetrates inland, as weaker it gets. It's time is between May to October. There
are big local differences.
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The northeast monsoon is of a very
different kind. It brings far less rain, rather dry and cooler winds from the
inner Asian continent (China). It's time is from December to February.
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Monsoon, actually the name of a
wind, is altogether a complicated climate activity around the equatorial zones
of the earth. It's triggered by the changing position of the sun around the
equator along the annual seasons. High- and low pressure areas and temperature
differences on the surface of the earth and water temperatures in the oceans
cause strong winds and overregional air streams who last for months. The
monsoon affects different parts of Southeast Asia in a different way. It
depends on their proximity to the equator, to the open sea and to the existence
or absense of mountains and mountain chains.
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Considered the annual variations of
the monsoon, generally spoken in Indochina the southwest monsoon starts
approximately in May and lasts until September / October / November. It brings
heavy rain. At the leeside of the mountains rainfall is significant less than
at the luvsides. A good example for that is the Tenasserim Mountain Range in
the south of Thailand. Ranong is the most rainy province in Thailand, for it
get's much of the southwest monsoon which is coming from India and is
continuing northeast deeply into China. As further distant an area is from the
coast, as less rain it receives. In Surin, northeast Thailand, there happens a
third of the rainfall only as comes down at the coasts of the Andaman Sea.
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The climax of the southwest monsoon,
in all-day-language called the 'rainy season', is then usually in September,
might stretch into October, then ceasing. From early November on it's usually
over. The four months from November to February mark the best times concerning
climate/weather conditions in Southeast Asia, for it's dry, still green and
less hot than in the other nine months of the year.
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After a certain, shorter time of
transfer it's changing into the northeast monsoon. In this time, between
December and February, the wind is coming from inner Asia, namely China and
brings cool and mostly dry air. In some regions as the north of Laos, Viet Nam
or Thailand (e.g. in the Golden Triangle) it can be quite cool in the evenings
and particularly in the mornings and forenoons. Sometimes the wind is coming
there down from the altitudes of the Tibetian Plateau in the Himalaya.
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There is also a southeast monsoon
streaming out of the Australian mainland. It starts dry and get's wet over the
sea in the Indonesian Archipelago. The southeast monsoon is reaching in it's
last outstretches maximal until Borneo, the southern tip of the Malay Peninsula
including Singapore.
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In the shorter transitional times
between the two monsoons the speed of the wind is lower than normally.
Sometimes there are heavy thunderstorms and blizzards, when a low-pressure area
is hanging over a region, particularly queuing at mountain ranges.
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