6 beautiful natural phenomenon only in winter

Thunder snow, mist flower stone, hard ice ... is the wonderful natural phenomenon was unbelievable.

Snowfall phenomenon occurs when the temperature is low, water molecules gather together, forming tiny ice crystals. These crystals gradually increase the weight and fall down. Past new, Cairo (Egypt) delighted the first time in 100 years, they are going through a snowy, white Christmas or as snow and white clad Sapa in 15/12 days when the temperature dropped strong.

Besides, there are many natural phenomena also occur in winter, but you can not know. Here are a few phenomena that can not be ignored under Mentafloss page list.

1. Hoarfrost

One of the first signs of winter was late fall frost. Is the phenomenon of frost frozen water vapor into small particles, such as salt and white on the ground or grassy surfaces, objects when moist air and cold. 

It is often formed in the winter night, calm weather, cloudy. However, frost is not interested just as white as salt, similar to the snow in the cold of the refrigerator compartment.

In the fall, the night sky is often cloudless, the wind dies, but the morning we saw the tears glistening deposited on grass and leaves. It is the county dew. 

If the temperature drops low enough ground, dew will condense into solid, porous, white as salt so called hoarfrost. Hoarfrost usually exists only within 1 to 2 hours before the sun rose. This type of precipitation mists beautiful but toxic, harmful to the crops and winter grasses.

2. United frost

United frost ice crystals are usually found in young sea ice and thin ice lakes. The ice crystals are almost similar but frost developed with a diameter of about 3 - 4cm.

Frost flowers on the sea ice formed when cold air thinner than the ice below. Often the difference between surface temperature and air tapes need at least 15 ° C.

When warm moist air meets cold air layer situated beneath becomes saturated and can condense as frost crystals on the surface of the sea ice. 

Conditions for continued frost flower development surface that is always wet and not frozen. As the ice grows too thick, on the surface of the ice will cool down very quickly and frost flowers can not grow. 

This means that frost flowers usually appear only once a year and only exists in the first few days of the formation of ice.

3. Hard Ice Dew

Hard ice is formed when water droplets in fog freeze objects around outside. It is usually seen on the plants that grow on the mountain peaks in the winter, when the low clouds cause freezing fog.

Hard ice is very dangerous, not only soft ice as similar to a thick layer of frost. It is very thick, hard, sharp and totally transparent.

Although it is generally seen where the terrain is high, frost coating also can form anywhere, but fog and cold winds occur simultaneously. It rarely appears at temperatures below -8 ° C because cold air can not hold enough moisture to produce freezing fog.

4. Thunder Snow

Thunder snow is common in the area around the lake and along the coast. In these places, sunlight can generate heat, gas columns formed relatively warm, moist, unstable, from which clouds appear chaotic.

But these clouds, if left alone can not create thunder snow. Conditions to create thunder snow is air layer between the cloud and the ground warmer than the layer of cloud cover, but still cold enough to produce snow. Not only that, this phenomenon also need combined with winds, which push warm air slightly upward, thus forming thunder snow.

Most cases create thunder snow storm comes the extreme, with high intensity winds, lightning mild, with snow density is quite thick, about 6 cm per hour. 

5. Fantasy Update (Parhelia)

Sun virtual or fake date are bright spots appeared the Sun about 22 degrees and the same distance above the horizon. This phenomenon has been known since ancient times and is sometimes referred to as "multi-sun".

When the ice crystals formed within the aura, it is oriented at random, they act like a prism follow all directions. And when the ice crystals "slip" into the atmosphere, it tends to fall into a vertical link, which will reflect light horizontally, this time, multi-sun phenomenon is formed .

 "Fantasy Update" can be created when the sun at any location in the sky, but usually most apparent when the sun in a low position, close to the horizon.

6. Moon author (paraselene)

Equivalent to daytime phenomenon "virtual date" fake moon is the bright point appears at night halo (ring the Moon) is located at coordinates 22 degrees 22 degrees to the right and left of Moon.

It occurs when ice crystals aligned vertically in the air and the light refracted horizontally. In folklore, the "moon ring" is said to predict the storm and the "fake moon" appears, it is believed that the coming storm will be quite strong.

The "fake moon" hardly visible to the naked eye because of its light is not enough to trigger the cone cells of the human eye.