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November 27, 2013

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Cold wave to drive down temperatures

The suburban areas are expected to see freezing mornings with lows of minus 1 to 3 degrees Celsius and black ice due to a cold wave that is expected to hit the city from today.

Weather forecasters said the cold chill will remain tomorrow and on Friday.

The cold wave, which will hit the city early today, will push the mercury down by 6 to 8 degrees.

The Shanghai Meteorological Bureau issued a warning about   the cold wave at 8pm yesterday and asked residents to keep warm.

“China divides cold air into five levels — weak cold air, moderate cold air, less strong cold air, strong cold air and cold wave. Cold wave is the strongest one,”  said Fu Yi, a chief service officer at the bureau.

A cold wave is a weather phenomenon that is distinguished by a cooling of the air. According to Fu, a cold wave refers to a rapid fall of 8 or more degrees in temperature within a 24 hour period, or a drop in temperature  of 10 or more degrees within 48 hours, to a low of 4 degrees or below. However, the skies will be a mix of sun and clouds during the cold wave.

A slight increase in temperatures is expected on Saturday.

“As there were lows above 10 degrees in December in the past five years, it is possible it could be the same this year,” said Fu.

Moderately polluted

A moderately polluted air condition was reported yesterday with the AQI reaching up to 200 from 11am to 1pm.

PM10 particles were marked as the main pollutant with a density peaking above 360 micrograms per cubic meter at 10am, about 2.4 times the nation’s limit of 150.

The PM2.5 particles density was also reported high as it peaked 140 micrograms per cubic meter at 9am, nearly doubled the limit of 75.

The Shanghai Environmental Monitoring Center predicted a better air quality for today as the weather conditions will drive out the pollutants.



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