Today (16th) the temperature in the urban area is as high as 32 degrees Celsius, but hail is suspected?
At about 1 pm, a number of netizens said that they found hailstones in Tseung Kwan O, and some of them uploaded photos with hailstones in their hands.
At about 1 o'clock, the Observatory issued a special weather warning that the rain in Tseung Kwan O was particularly heavy, and heavy rain with an hourly rainfall of more than 70 millimeters had been recorded or expected, and severe flooding might occur.
The Observatory said at 1:22 pm that there was a report of hail in Tseung Kwan O at around 1:00 pm. It is expected that Hong Kong may continue to be affected by hail in the short term.
Looking at the data, since 1967, Hong Kong has recorded a total of 40 sunset hail, two of which were from September.
Looking at the Observatory’s past articles, hail falling is a natural phenomenon that is not common in Hong Kong. It only occurs once every one to two years. In the past 20 years, there have been 11 reports of hail in Hong Kong.
In recent years, a large-scale hailstorm occurred in the local area on the evening of March 30, 2014.
Affected by the trough of low pressure that night, torrential rain and strong thunderstorms occurred in a wide area of Hong Kong, accompanied by hail, and the Observatory needed to issue a black rainstorm warning signal.
During heavy rains, the Observatory received reports of hail from many areas in Hong Kong. Most of the reported hail were about 20-30 mm in size.
As for the cause of hail, the Observatory once pointed out that hail is a large ice particle produced in a strong thunderstorm. When a strong thunderstorm occurs, the vertical movement of the atmosphere is very violent.
Since the temperature of the troposphere generally decreases with height, when the warmer and humid air rises, the moisture in the air will condense.
Due to the violent updraft, water vapor will be carried above the frozen layer and continue to roll around, condensing into ice particles.
During the rolling process, the ice particles continue to absorb water, and roll bigger and bigger like a "snowball". Finally, when the updraft can no longer support the weight of the ice particles, the overweight ice particles will fall to the ground and form hail.
Screenshot of the Observatory website
More than 1,500 lightning strikes recorded within 1 noon in Hong Kong
According to the Observatory’s website, multiple lightning strikes were also recorded in the New Territories East. Between 12 noon and 1 am, 997 cloud lightnings were recorded across Hong Kong, of which 670 occurred in the New Territories East; as for electricity-to-ground lightning, there were 549 lightning strikes. , Of which as many as 441 occurred in New Territories East.
Weather and traffic | sunny and hot local areas with thunderstorms, the highest temperature is about 32 degrees Weather traffic | showers last until the weekend, today's highest temperature is about 32 degrees ｜The bus route of Shek Kip Mei Village Fire Alarm No. 6 was diverted. Today is very hot and rainy. The highest weather is about 33 degrees. Traffic.
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