Cold Christmas | Cold rain and cold wind produce wind-chill effect, the actual feeling is lower than 9 degrees Observatory: This time it’s freezing

Christmas is approaching, and the Observatory expects to be "frozen" this Christmas holiday.

The Observatory predicts that a strong winter monsoon will reach the coast of Guangdong tomorrow (25th), and it will become significantly colder next Sunday (26th) and next Monday (27th). The minimum temperature in the urban area will drop to 9 degrees Celsius; Affected by high-altitude disturbance, it will be cloudy with rain, and the relative humidity will reach 95% in the two days.

According to the Observatory, cold rain and cold wind will make you feel particularly cold, which is called "humid freezing", because high winds and water points attached to the body will accelerate the heat away from the body.

The Observatory also reminded, "It's freezing (this time), remember to make a winter shirt out!"

▼On December 21st, "Rey" weakened the observatory and cancelled all tropical cyclone warning signals▼

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The day of unpacking gifts sees a low of 11 degrees and drops to 9 degrees next Monday

According to the Observatory, the air pressure in northern South China is rising, and a strong winter monsoon is expected to reach the coast of Guangdong in the evening. It is predicted that the weather will turn cooler and there will be one or two rains tomorrow night on Christmas Day. Three degrees.

The Observatory also predicted that Sunday’s "Unpacking the Gifts Day" noticeably turned cold, and the temperature in the urban area was as low as 11 degrees, reaching cold levels.

The minimum temperature dropped to 9 degrees next Monday, and it was as cold as 7 degrees in many areas of the New Territories.

Sunday and next Monday are cloudy and rainy, with relative humidity ranging from 80% to 95%; the other two days are also windy, with stronger winds offshore and on high ground.

Under the cold rain and cold wind, the Observatory is expected to have a "frozen Christmas holiday."

Cold rain and cold wind take away the heat and make you feel colder

Why does it feel particularly cold under "humid freezing"?

The Observatory explained that air movement helps to take away the body's heat. Therefore, in the case of strong winds, the heat is removed faster and it feels particularly cold. This phenomenon is generally called the "wind chill effect."

In addition, it feels cold in rainy days because water has a higher thermal conductivity than air, and the water points attached to the body are easier to lose heat from the body.

Therefore, if you encounter strong winds and rainy days in winter, the feeling of cold will be more obvious, and the temperature felt, the so-called "sensory temperature", will be lower than the actual temperature measured by the instrument.

In addition, the Macao Meteorological Bureau expects that the strongest cold air since the beginning of winter this year will affect Macao tomorrow. It is predicted that the northerly wind will strengthen tomorrow and the temperature will drop significantly.

According to the Meteorological Administration, the weather is overcast with rain, and the wind is strong, and the feeling of cold will be more obvious.

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