Why was it so calm before the storm?

Because storms are usually the product of typhoons/tropical cyclones, they need a lot of energy to carry out.

The weather under the cyclone is very unstable, and there are often heavy rains.

Most of these cyclones are low-pressure centers.

Will inhale clouds from nearby areas.

This makes the nearby area sunny.

So it will be sunny/hot until the whirlwind comes.

Two or three days before the arrival of the typhoon, we can judge that the typhoon is approaching from several phenomena, namely: (1) the appearance of high clouds: at the outermost edge of the typhoon, there are cirrus clouds, white feathered or ponytail clouds. When such a cloud appears in a certain direction and gradually thickens into a dense cirrostratus, it indicates that there may be a typhoon approaching. (2) Thunderstorms stop: In summer in Taiwan Province Province, there are frequent thunderstorms in mountainous areas and basin areas every afternoon. If the thunderstorm stops suddenly, it means that a typhoon may be approaching. (3) Good visibility: Two or three days before the typhoon, visibility improved, and mountains and trees in the distance can be seen clearly. (4) The land-sea wind is not obvious: usually, the wind blows from the sea to the land during the day and from the land to the sea at night, which is called sea breeze and land breeze, but this phenomenon is not obvious a few days before the typhoon comes. (5) Long wave: In the offshore of Taiwan Province Province, due to the mild summer monsoon, the waves are relatively stable, but when there is a typhoon in the distance, the waves will become more turbulent and gradually spread to the coast of Taiwan Province Province, resulting in long waves. Residents along the eastern coast have this experience. (6) Hamming: As the typhoon approaches, the long waves are getting bigger and higher, hitting the coastal cliffs and making a roar, which is often heard along the eastern coast. After that, the typhoon will come in about 3 hours. (7) Sudden showers stop: When high clouds appear, the clouds gradually become denser and lower, and showers often stop, which is also a sign of typhoon approaching. (8) Wind direction change: Taiwan Province Province often blows southwest wind in summer, which is also gentle. However, if it is changed to northeast wind, it means that the typhoon is approaching and has begun to be affected by the edge of the typhoon, and then the wind speed will gradually increase. (9) Special sunset glow: Two days before 1 and typhoon strikes, when the sun sets, several beautiful rays of radial red and blue are often emitted from the western horizon, which are directed at the zenith and then converge in the symmetry between the east and the sun. This phenomenon is called anti-twilight. (10) Air pressure decrease: According to the above phenomenon, if the air pressure gradually decreases again, it means that it will enter the typhoon edge. As far as meteorology is concerned, the formation of a strong storm requires many conditions (because the storm may refer to a typhoon with low pressure, or it may refer to local Mao Mao rain, which is unclear in definition and has different reasons, so in short ...), so much energy accumulated in the air generally needs a period of brewing, and in this process, it is necessary to absorb the water vapor and heat flow in the air. The surrounding area presents a calm weather pattern in Wan Li because of energy absorption ... This phenomenon is used to describe what is bound to happen. The short-term calm state before the incident is called "the calm before the storm?" "If the typhoon hits Taiwan Province at this time, it will also cause cloudless Wan Li, Taiwan Province Province! Of course there are exceptions. I don't know if you have heard this proverb: "One thunder breaks nine stops". Although this sentence echoes the calm before the above storm, there is actually a sentence to be added later: "One thunder broke nine stops, and one more"! There are also many exceptions, such as many autumn platforms, because typhoons in autumn often cooperate with the attack of the front, which will cause thunderstorms, so the tranquility above before the storm can't match. There are also many typhoons in summer. For example, before Coral came this time, there was a thunderstorm the day before yesterday. There was a thunderstorm in Pingtung before Haitang hit.