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sacha777

Unusually low temperatures in Shanghai, China

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The monsoon there is about May-August, but as a rule it is caused by tropical air (the ITCZ) moving north. Shouldn't be bringing down cold air masses (if you can call 17-18C cold)- air from the North would have come from Russia which is normally warmer than that this time of year.

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Strange as up here in Beijing we've had one of the warmest spells of the year the last few days. Typhoons do bring the coolest type of summer weather to eastern China however - often the maximum temperature will go down to around 25C instead of being in the low to mid 30s. 

 

Flooding is probably going to be more of a concern in Shanghai/Zhejiang over the next few days. It had already been raining for about a week before the typhoon arrived!

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The monsoon there is about May-August, but as a rule it is caused by tropical air (the ITCZ) moving north. Shouldn't be bringing down cold air masses (if you can call 17-18C cold)- air from the North would have come from Russia which is normally warmer than that this time of year.

Judging by the article it seems the "cool spell" was probably caused by evaporative cooling due to heavy rain falling and evaporating into a shallow surface layer of cool Maritime Polar air from the Sea Of Japan/North Pacific.  If the cool air had come from Russia (Continental Polar air) conditions would have been dry instead of wet.

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Rather cold in Hong Kong today it should be around 18c instead it was just 3c a few hours ago

 

 

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BBC article- http://www.bbc.com/news/world-asia-35397763

A cold snap sweeping across East Asia has led to more than 50 deaths in Taiwan and stranded at least 60,000 tourists in South Korea.

Parts of Guangzhou and Shenzhen in southern China have also seen the rare appearance of snow, while the southern Japanese island of Okinawa has seen sleet for the first time ever, report Chinese and Japanese media.

In South Korea, more than 500 domestic and international flights have been cancelled in Jeju as the island, known for balmy weather and beaches, saw -6C weather. 

In Hong Kong, residents shivered in 3C, the lowest temperature there in nearly 60 years.

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