What is the strange weather phenomenon like?

In the ever-changing weather phenomenon, there are often some unusual situations. These situations can only occur once in decades or hundreds of years, or even once-in-a-lifetime strange phenomena that will never reappear. They have surpassed the general laws of weather changes and become "treasures" in meteorological scientific research. These unusual weather phenomena have greatly broadened people's horizons and enriched the treasure house of human astronomical knowledge.

In the middle of winter, snowflakes can often be seen flying all over the sky in most parts of China. These white and soft snowflakes are light and small, but they are as big as goose feathers. However,1915 65438+10/0 in Berlin, Germany experienced an amazing snowfall. Snowflakes are as big as dishes, with a diameter of 8 ~ 10 cm. They are shaped like dishes and their edges are upturned, so they are called "snow vegetables". When it falls from the sky, it is much faster than other small snowflakes around it and is less affected by the wind; For people on the ground, it is like some white plates falling from the sky. When I fell to the ground, I didn't even have a snow tray upside down.

As early as 1887, the phenomenon of "snow vegetables" appeared in Britain. The temperature that day was slightly higher than freezing point and the relative humidity was saturated (100%). Snowflakes were not too big at first, but gradually became bigger, with the diameter increasing from 6.5 cm to 7 cm, and finally reaching 9 cm. At that time, some people divided the collected snowflakes into one group according to every 10, and the weight of each group was between 1. 1 ~ 1.4g, which was several hundred times heavier than the usual snowflakes.

What's more, in the winter of 1887, near a farm in the mountains of Montana in the northwest of the United States, the snow was surprisingly large, with a diameter of 38 cm and a thickness of 20 cm, even larger than the local milk pot used to boil milk.

These extra-large snowflakes, it is speculated that the larger snowflakes may become bigger in the process of falling, because they absorb the smaller snowflakes at high speed, which is similar to "snowballing".

hail

In natural disasters, hail often brings us great losses. 1On July 3, 788, a hail swept through most parts of France from southwest to northeast, and millions of tons of ice fell from the sky. The largest hail weighed half a catty. In the hail area, large livestock were injured and small livestock died. Wild birds were not seen in the forest for a long time, and crops, fruit trees and trees were scattered all over the place.

1in March, 968, a hailstorm weighing 2 Jin in Bihar, India, killed the calf on the spot. For India, a hail as big as this appeared once in May of 1929, with a diameter of 13cm and a weight of 2kg.

On the afternoon of May 1894, 1 1, hail occurred in Vicksburg, USA. The hail is very big. The hail center of these hail is not condensed by supercooled water droplets and ice crystals, but is composed of an alabaster block. The diameter of each solid core is 65438 0.3 ~ 65438 0.9 cm. There was also hail in Bowen, eight miles east of the city. One of the hailstones is quite large, with a diameter of 15.2 ~ 20.3 cm. What is even more surprising is that there was a turtle (an edible turtle that burrowed in the southern United States) in this hail. It was tightly surrounded by ice and was imprisoned in the hail like a small insect in amber. On that day, these areas were at the southern edge of the cold air control zone, and the atmospheric stratification was extremely unstable, with strong cyclones or gusts. It is conceivable that the tortoise flew from the ground to the sky with the help of the whirlwind. In the turbulent sea of clouds, it is surrounded by layers of ice and snow into a hail heart, and it is getting bigger and bigger. It was not until the updraft could no longer support itself that it fell to the ground as a hail block, which became an anecdote in the history of hail.