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What is the "Winter Monsoon"?

Paris
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What is the "Winter Monsoon"?

What is the winter monsoon.

For me, monsoon means a time whn it rains a lot, but I know that Winter is the dry season for HK.

Guangzhou, China
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1. Re: What is the "Winter Monsoon"?

I don't think the terms "rain season" or "dry season" applies in HK

Check this please

hko.gov.hk/education/edu01met/wxphe/ele_wint…

Edited: 04 December 2013, 17:49
Colombo, Sri Lanka
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for Sri Lanka
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2. Re: What is the "Winter Monsoon"?

The word monsoon simply means a longer-lasting wind pattern. It can be a carrier of lots of rain as it is in India and much of SE Asia, but that's not a law. In HK apparently it simply indicates the wind pattern. In Sri Lanka situation is similar, the southwest monsoon there at least is hardly associated with heavy rain (but the east monsoon is more wet).

All the best,

<Erik> & [Sandya]

Paris
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3. Re: What is the "Winter Monsoon"?

Thanks

HK
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4. Re: What is the "Winter Monsoon"?

Could say its a 'Mistral' at the moment with cold air coming down for China. The winds are not strong but the big effect is on night-time temperature after the sun sets.

http://www.hko.gov.hk/contente.htm

Hong Kong, China
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5. Re: What is the "Winter Monsoon"?

It's a Govt euphemism for the more polluted part of the year :-)

Hong Kong, China
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6. Re: What is the "Winter Monsoon"?

The "winter monsoon," also called the "northeast monsoon", is the prevailing seasonal wind over Hong Kong.

The HK Observatory (an institution I am proud to say my tax dollars support!) provides this explanation on their website:

Land and sea breezes are familiar weather phenomenon and these breezes begin to blow as a result of the diurnal temperature and pressure variations between land and sea. Monsoon winds have periodic alternation of direction and may be thought of as a very large-scale land and sea breezes, but having a seasonal characteristic: winter and summer, instead of diurnal.

The primary cause of the winter monsoon is the differential warming and cooling over land and ocean. In winter, air over the land cools faster with lower temperature than the air over the ocean. The temperature differences give rise to pressure differences which in turn generate air flowing from land to sea. With the arrival of winter surge, air temperatures over the mainland China are lower than the air temperatures over the South China Sea and give rise to pressure differences. The cold airmass from the high pressure area over the mainland China flows southwards towards the relatively low pressure area over the South China Sea due to the pressure gradient force. Winds will be diverted slightly due to the effect of the Earths rotation which is known as the Coriolis effect. The Coriolis force always acts perpendicularly to the wind direction, steering the air to the right, and finally the air spirals clockwise around the high-pressure system in the northern hemisphere. In the southern hemisphere, the Coriolis force acts to the left and winds spiral anti-clockwisely around the high-pressure system. Apart from the Coriolis force, winds near the Earths surface will be retarded by the effect of friction which is always opposite to the direction of air motion.

Under the combined effect of the pressure gradient force, the Coriolis force and friction, the prevailing winds in winter monsoon will generally be blowing from the sector between the north and the east over southern China, hence the term northeast monsoon.

For more information, check out the Observatory's "Monsoon" Page:

weather.gov.hk/education/edu01met/edu01_mons…

7. Re: What is the "Winter Monsoon"?

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